Texas Instruments LM5164-Q1 EVM User manual

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LM5164-Q1 EVM User Guide
User's Guide
SNVU620A–September 2018–Revised April 2019
LM5164-Q1 EVM User Guide
The LM5164-Q1 EVM is a 100-V DC/DC buck regulator that employs synchronous rectification to achieve
high conversion efficiency in a small footprint. The EVM operates over a wide input voltage range of 15 V
to 100 V to provide a regulated 12-V output at 300-kHz switching frequency. The output voltage has better
than 1.5% setpoint accuracy and is adjustable using an external resistor divider. The module design uses
the LM5164-Q1 synchronous buck converter with wide input voltage (wide VIN) range, wide duty-cycle
range, integrated high-side and low-side power MOSFETs, cycle-by-cycle overcurrent protection, and
precision enable. With AEC-Q100 grade 1 automotive qualification, the LM5164-Q1 is rated to operate
over a junction temperature range of –40°C to +150°C. The LM5164-Q1 is available in an 8-pin SO
PowerPAD™ package to enable high density, low component count DC/DC solutions. The LM5164-
Q1EVM-041 evaluation module is qualified for the LM5164 as well as the LM5164-Q1 buck converter. See
Table 1 for package information.
Use the LM5164-Q1 with WEBENCH® Power Designer to create a custom regulator design. Furthermore,
the user can download the LM5164-Q1 Quickstart calculator to optimize component selection and
examine predicted efficiency performance across line and load ranges.
Table 1. Device and Package Configurations
CONVERTER IC PACKAGE
U1 LM5164-Q1 8-pin SO package with PowerPAD (4.89 mm × 3.90 mm)
LM5164

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Contents
1 General TI High Voltage Evaluation User Safety Guidelines .......................................................... 3
2 Overview...................................................................................................................... 5
3 EVM Characteristics......................................................................................................... 7
4 LM5164-Q1 Evaluation Module............................................................................................ 7
5 Schematic ................................................................................................................... 10
6 PCB Layout ................................................................................................................. 11
7 Bill of Materials ............................................................................................................. 13
8 Performance Curves....................................................................................................... 14
List of Figures
1 LM5164-Q1 Pin Configuration (8-Pin SO Package with PowerPAD, Top View).................................... 5
2 LM5164-Q1 Buck Regulator Simplified Schematic...................................................................... 5
3 LM5164-Q1 EVM Top View ................................................................................................ 8
4 LM5164-Q1 EVM Schematic ............................................................................................. 10
5 Top Layer and Silkscreen Layer ......................................................................................... 11
6 Mid-Layer 1 Ground Plane................................................................................................ 11
7 Mid-Layer 2 Routing ....................................................................................................... 12
8 Bottom Layer Routing ..................................................................................................... 12
9 Efficiency Performance (Log Scale) ..................................................................................... 14
10 Efficiency Performance (Linear Scale) .................................................................................. 14
11 Load and Line Regulation Performance................................................................................. 14
12 Load Transient Response................................................................................................. 14
13 No Load Start-up with VIN................................................................................................ 14
14 Full Load Start-up with VIN ............................................................................................... 14
15 No Load Start-up with EN/UVLO......................................................................................... 14
16 Full Load Start-up/Shutdown with EN/UVLO ........................................................................... 14
17 EN/UVLO Start-up in Prebias............................................................................................. 14
18 Short Circuit................................................................................................................. 14
19 Short-Circuit Recovery .................................................................................................... 14
20 No-Load/Short Circuit and Short-Circuit Recovery .................................................................... 14
21 No-Load Switching......................................................................................................... 15
22 Full-Load Switching........................................................................................................ 15
23 Thermal Performance...................................................................................................... 15
24 Thermal Performance...................................................................................................... 15
25 CISPR 25 Class 5 Conducted Emissions Plot, 150 kHz to 30 MHz ................................................ 16
26 CISPR 25 Class 5 Conducted Emissions Plot, 30 MHz to 108 MHz ............................................... 16
27 CISPR 25 Class 5 Conducted Emissions Plot, 150 kHz to 30 MHz ................................................ 16
28 CISPR 25 Class 5 Conducted Emissions Plot, 30 MHz to 108 MHz ............................................... 16
List of Tables
1 Device and Package Configurations ...................................................................................... 1
2 EVM Electrical Performance Characteristics............................................................................. 7
3 LM5164-Q1 EVM Bill of Materials........................................................................................ 13
Trademarks
PowerPAD is a trademark of Texas Instruments.
All other trademarks are the property of their respective owners.

WARNING
www.ti.com General TI High Voltage Evaluation User Safety Guidelines
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1 General TI High Voltage Evaluation User Safety Guidelines
Always follow TI’s set-up and application instructions, including use of all interface components within their
recommended electrical rated voltage and power limits. Always use electrical safety precautions to help
ensure your personal safety and the safety of those working around you. Contact TI’s Product Information
Center http://support.ti.com for further information.
Save all warnings and instructions for future reference.
Failure to follow warnings and instructions may result in personal injury, property damage, or
death due to electrical shock and/or burn hazards.
The term TI HV EVM refers to an electronic device typically provided as an open framed, unenclosed
printed-circuit board assembly. It is intended strictly for use in development laboratory environments,
solely for qualified professional users having training, expertise, and knowledge of electrical safety risks in
development and application of high-voltage electrical circuits. Any other use and/or application are strictly
prohibited by Texas Instruments. If you are not suitably qualified, you should immediately stop from further
use of the HV EVM.
•Work Area Safety:
– Maintain a clean and orderly work area.
– Qualified observer(s) must be present anytime circuits are energized.
– Effective barriers and signage must be present in the area where the TI HV EVM and its interface
electronics are energized, indicating operation of accessible high voltages may be present, for the
purpose of protecting inadvertent access.
– All interface circuits, power supplies, evaluation modules, instruments, meters, scopes, and other
related apparatus used in a development environment exceeding 50 VRMS/75 VDC must be
electrically located within a protected Emergency Power Off (EPO) protected power strip.
– Use a stable and non-conductive work surface.
– Use adequately insulated clamps and wires to attach measurement probes and instruments. No
freehand testing whenever possible.
•Electrical Safety:
As a precautionary measure, it is always a good engineering practice to assume that the entire
EVM may have fully accessible and active high voltages.
– De-energize the TI HV EVM and all its inputs, outputs, and electrical loads before performing any
electrical or other diagnostic measurements. Confirm that TI HV EVM power has been safely de-
energized.
– With the EVM confirmed de-energized, proceed with required electrical circuit configurations, wiring,
measurement equipment hook-ups, and other application needs, while still assuming the EVM
circuit and measuring instruments are electrically live.
– When EVM readiness is complete, energize the EVM as intended.
WARNING: While the EVM is energized, never touch the EVM or its electrical circuits as they
could be at high voltages capable of causing electrical shock hazard.

!
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•Personal Safety:
– Wear personal protective equipment, for example, latex gloves and/or safety glasses with side
shields or protect EVM in an adequate lucent plastic box with interlocks from accidental touch.
•Limitation for Safe Use:
– EVMs are not to be used as all or part of a production unit.
Safety and Precautions
The EVM is designed for professionals who have received the appropriate technical training, and is
designed to operate from an AC power supply or a high-voltage DC supply. Please read this user guide
and the safety-related documents that come with the EVM package before operating this EVM.
CAUTION
Do not leave the EVM powered when unattended.
WARNING
Hot surface! Contact may cause burns. Do not touch!
WARNING
High Voltage! Electric shock is possible when connecting board to
live wire. Board should be handled with care by a professional.
For safety, use of isolated test equipment with overvoltage and
overcurrent protection is highly recommended.

VOUT = 12 V
SW
BST
PGOOD
VIN
EN/UVLO
GND
RON FB
LM5164-Q1
COUT
47 PF
CIN
2.2 PF
VIN = 15 V...100 V IOUT = 1 A
LO
68 PH
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CBST
2.2 nF RFB1
453 k:
RFB2
49.9 k:
RRON
100 k:
RA
453 k:
CA
3.3 nF
CB
56 pF
U1
VIN
SW
EN/UVLO
BST
GND
RON FB
PGOOD
EP
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2 Overview
2.1 LM5164-Q1 Synchronous Buck Converter
The LM5164-Q1 step-down switching converter features all the functions needed to implement a low-cost,
high-efficiency buck regulator capable of supplying 1 A to the load. An adaptive constant on-time (COT)
control scheme and diode emulation mode at light loads enable a no-load supply current as low as 24 μA
at 48-V input. With integrated 100-V power MOSFETs, synchronous rectification achieves high conversion
efficiency over a wide load current range. Various features incorporated for enhanced reliability and safety
include cycle-by-cycle peak current limit, thermal shutdown protection, internal output voltage soft-start
timer, 1.5-V precision enable threshold, and an open-drain PGOOD indicator for sequencing and fault
reporting.
Figure 1 shows the pin configuration of the LM5164-Q1. Figure 2 presents the regulator schematic for
quick reference.
Figure 1. LM5164-Q1 Pin Configuration (8-Pin SO Package with PowerPAD, Top View)
Figure 2. LM5164-Q1 Buck Regulator Simplified Schematic
2.2 Typical Applications
• Automotive 48-V Mild Hybrid ECU Bias Supplies
• Automotive DC/DC Converter, PTC Heater, HVAC Compressors
• High Cell Count Battery Packs for E-Bikes, E-Scooters and Drones
• General-Purpose Bias Supplies
• Automotive and Industrial Battery-Powered Equipment

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2.3 EVM Performance Specifications
• Tightly-regulated output voltage of 12 V with 1% setpoint accuracy, adjustable from 1.2 V to VIN
• Wide input voltage operating range of 15 V to 100 V
• Ultra-high power conversion efficiency:
– >90% at an output voltage of 12 V and load current above 3 mA (input voltage 24 V)
• No-load supply current as low as 24 µA (without EN/UVLO resistor divider)
• Integrated 0.7-ΩNMOS buck switch supports 99% duty cycle for low dropout voltage
• Integrated 0.3-ΩNMOS synchronous rectifier eliminates external Schottky diode
• ENABLE and PGOOD terminals with 1-MΩand 100-kΩpullups to VIN and VOUT, respectively
• Monotonic pre-bias output voltage startup
• Programmable input UVLO via precision enable (internally set to turn on and off at 1.5 V and 1.4 V,
respectively)
• Fully assembled, tested and proven PCB layout

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3 EVM Characteristics
(1) The default output voltage of this EVM is 12 V. Efficiency and other performance metrics will change based on the operating
input voltage, output voltage, load current, output capacitance, and other parameters.
Table 2. EVM Electrical Performance Characteristics
Parameter Test Conditions MIN TYP MAX UNITS
INPUT CHARACTERISTICS
Input voltage range, VVIN EVM input voltage operating range 15 48 100 V
Input voltage turn on, VIN(ON) Adjusted by EN/UVLO resistors 6.0 V
Input voltage turn off, VIN(OFF) 5.6 V
Input voltage hysteresis, VIN(HYS) 0.4 V
Input current, no load, IIN(NL) IOUT = 0 A VIN = 24 V 44 µA
VIN = 48 V 60 µA
Input current, disabled, IIN(OFF) VEN/UVLO = 0 V VIN = 24 V 29 µA
OUTPUT CHARACTERISTICS
Output voltage, VOUT(1) VOUT follows VIN for VIN < 12V 12.0 V
Output current, IOUT VVIN = 15 V to 100 V 0 1 A
Output voltage regulation, ΔVOUT Load regulation IOUT = 0.1 A to 1 A 0.75%
Line regulation VVIN = 15 V to 100 V 1.5%
Output voltage ripple, VOUT(AC) VIN = 48 V, IOUT = 1 A 30 mVp-p
Output overcurrent protection, IOCP VIN = 48 V 1.4 A
Soft-start time, tSS 3 ms
SYSTEM CHARACTERISTICS
Switching frequency in CCM, FSW(nom) VIN = 48 V 300 kHz
Half-load efficiency, ηHALF(1) IOUT = 0.5 A VIN = 24 V 95%
Full load efficiency, ηFULL IOUT = 1 A
VIN = 15 V 93.2%
VIN = 24 V 93.4%
VIN = 48 V 92.1%
VIN = 100 V 86%
4 LM5164-Q1 Evaluation Module
The LM5164-Q1 EVM is configured to deliver 12 V and 1 A at a switching frequency of 300 kHz. As
shown in Figure 2, a type 3 ripple generation circuit is used to generate the appropriate voltage ripple on
FB. This circuit uses an RC network (consisting of RAand CA) between SW and VOUT to create a triangular
ramp. This triangular ramp is then AC coupled into the feedback node with capacitor CB. This method is
best suited for applications where low output voltage ripple is required and where ceramic output
capacitors are used (since it is not using the output voltage to generate the ripple signal).
4.1 Quick Start Procedure
1. Connect the voltage supply between VIN and GND connectors using short wires.
2. Connect the load of the converter between VOUT and GND connectors using short wires.
3. Set the supply voltage (VVIN) at an appropriate level between 15 V to 100 V. Set the current limit of the
supply to an appropriate level as well.
4. Turn on the power supply. The EVM powers up and provides VOUT = 12 V.
5. Monitor the output voltage while increasing the load current to 1 A max.
See Figure 3 for the location of the connectors.

CAUTION
Caution Hot surface.
Contact may cause burns.
Do not touch.
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Figure 3. LM5164-Q1 EVM Top View
4.2 Detailed Descriptions
This section describes the connectors and the test points on the EVM and how to properly connect, set up
and use the LM5164-Q1 EVM. See Figure 3 for a top view of the EVM.
VOUT —Output voltage of the converter.
VOUT connector and test point connected to the power inductor and the output capacitors. Connect
the loading device between VOUT and GND connectors to provide loading to the regulator.
Connect the loading device to the board with short wires to handle the DC output current.
GND — Ground of the converter.
It is connected to the LM5164-Q1 GND as well as the return terminals of the input and output
capacitors. GND is the current return path for both supply voltage and load. Connect to supply and
load grounds with short wires.
VIN —Input voltage to the converter.
VIN connector and test point connects to the input capacitors and the VIN pin of the LM5164-Q1.
Connect the supply voltage from a power supply or a battery between the VIN and GND
connectors. The voltage range should be higher than 6 V for the device to be active. VVIN higher
than 15 V provides a regulated 12 V output voltage. To avoid damaging the device VVIN should be
no greater than 100 V. The current limit on the supply should be high enough to provide the needed
supply current when the output is fully loaded. The supply voltage should be connected to the
board with short wires. If long cables are used to power up the board, add a damping capacitor C8
to avoid oscillation between the cable parasitic inductance and the low-ESR input ceramic
capacitors.
VIN-EMI —Input voltage to input filter of the converter.
If an input filter is desired between the supply voltage and the LM5164-Q1, connect the supply
voltage between VIN-EMI and GND-EMI. The supply voltage should be connected to the board with
short wires.

UV2 UV1
IN(on)
1.5V 1.5V
R R 1M 332k
V 1.5V 6V 1.5V
˜ ˜ : :
 
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GND-EMI —Ground connection near the input filter.
This is the current return path for the supply connected to VIN-EMI. It provides a direct connection
to the input filter capacitors to filter conducted noise generated by the converter. Use VIN-EMI and
GND-EMI connections at the input filter to minimize EMI.
Input Filter— EMI mitigation.
The input filter consists of a filter inductor, ferrite bead and ceramic capacitors. An electrolytic
capacitor is included for bulk energy storage and input parallel damping. To include the input filter
in the power path, connect the supply voltage between VIN-EMI and GND-EMI. The output side of
the filter is connected to the VIN net, which is connected to the LM5164-Q1 VIN pin and input
capacitors.
Conducted EMI arises from the turn-on and turn-off transition of power switches that generate large
discontinuous currents at the input of the buck converter, resulting in voltage ripple. The input filter
helps smooth out this voltage ripple at the regulator input.
EN/UVLO — Test point to monitor the EN/UVLO pin of the device.
This test point is to monitor the voltage on the device EN/UVLO pin.
EN/UVLO Jumper — Set EN/UVLO pin options.
Use this jumper to enable/disable the LM5164-Q1. PIN-1 is connected to GND and PIN-2 is
connected to EN/UVLO.
1. Connect PIN-1 to PIN-2 to disable the device.
2. Leave PIN-1 and PIN-2 open for EN/UVLO to be connected to VIN through a resistor divider.
PIN-1 and PIN-2 are not connected in the default setting. Calculate the lower UVLO resistor, RUV2,
based on the desired turn-on voltage of 6 V and the selected upper UVLO resistor, RUV1,of1MΩ
using Equation 1.
(1)
If a resistor divider is not required, RUV2 can be removed such that the EN/UVLO voltage pulls up to
the input voltage.
PGOOD — PGOOD jumper.
PGOOD jumper with PIN-1 connected to PGOOD and PIN-2 connected to GND. PIN-1 can be
used as a test point to monitor the power-good indicator. This flag indicates whether the output
voltage has reached its regulation level. The LM5164-Q1 PGOOD is an open-drain output that is
tied to VOUT through resistor R10.
Edge Connector —Additional connector to attach the EVM to a cable harness.
The edge connector provides the option of connecting the EVM to a cable harness if available. It
includes the power connections: VIN, VIN-EMI, GND, GND-EMI and VOUT. It also has Kelvin
sense connections for VIN, VOUT, and GND. See the schematic in Figure 4 for all signals
connected to the edge connector.

3300pF
C4
33uF
C8
2.2uF
C9
C5
DNP
1
2
3
4
5
6
7
8
9
10
11
12
A
B
C
D
E
F
H
J
K
L
M
N
TOPBOT
EC1
68uH
L1
C12
DNP
C13
DNP
GNDGND GND
GND
GND GND
GND
GND
GND
GND
C2
DNP
R1
DNP
TP1
TP6
TP2
TP3
TP4
TP5
GND
0.01µF
C14
DNP
J3
GND
J2
GND
Snubber RC
C15
DNP
R3
DNP
J1
DNP
2.2uF
C10
GND
J5
DNP
J4
DNP
PG
VOUT
GND
J6
GND 1
VIN
2
EN/UVLO
3
RON
4FB 5
PGOOD 6
BST 7
SW 8
PAD 9
LM5164QDDARQ1
U1
RON
EN
VIN
0
R2
BST
SW
FB
PG
L3
4.7uF
C16
4.7uF
C17
VIN
15uH
L2
4.7uF
C18
VIN_EMI
GND_EMI
0.1µF
C20
0.1µF
C19
GND
0.1µF
C1
GND
GND_EMI
GND_EMI
EN
PG
VIN_EMI
VIN_EMI
VIN
VIN
VIN
GND
GND
GND
GND
VOUT
VOUT
VOUT
VOUT
105k
R8
1.00M
R5
332k
R7
100k
R10
49.9k
R9
453k
R4
453k
R6
2200pF
C3
22µF
C6
22µF
C7
56pF
C11
Schematic www.ti.com
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5 Schematic
space
space
space
space
space
space
Figure 4. LM5164-Q1 EVM Schematic

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6 PCB Layout
Figure 5 through Figure 8 show the board layout for the LM5164-Q1EVM-041. The EVM offers resistors,
capacitors, and test points to configure the output voltage, precision enable, and switching frequency.
The 8-pin SO PowerPAD™ package offers an exposed thermal pad, which must be soldered to the
copper landing on the PCB for optimal thermal performance. The PCB consists of a 4-layer design. There
are 2-oz copper planes on the top and bottom and 1-oz copper mid-layer planes to dissipate heat with an
array of thermal vias under the thermal pad to connect to all four layers.
Test points have been provided for ease of use to connect the power supply, required load, and to monitor
critical signals. The 12-pin edge connector can also be used to facilitate the use of a cable harness if
required.
Figure 5. Top Layer and Silkscreen Layer
Figure 6. Mid-Layer 1 Ground Plane

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Figure 7. Mid-Layer 2 Routing
Figure 8. Bottom Layer Routing

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7 Bill of Materials
Table 3. LM5164-Q1 EVM Bill of Materials
Ref Des Value Description Package Part Number Vendor Qty
C1, C19,
C20 0.1µF CAP, CERM, 0.1 µF, 100 V, ±10%, X7R, AEC-Q200 Grade 1, 0603 0603 HMK107B7104KAHT Taiyo Yuden 3
C3 2200pF CAP, CERM, 2200 pF, 50 V, ±10%, X7R,
AEC-Q200 Grade 1, 0402 0402 GCM155R71H222KA37D MuRata 1
C4 3300pF CAP, CERM, 3300 pF, 100 V, ±10%, X7R,
AEC-Q200 Grade 1, 0603 0603 CGA3E2X7R2A332K080 AA TDK 1
C6, C7 22uF CAP, CERM, 22 µF, 25 V, ±10%, X5R,
AEC-Q200 Grade 3, 1210 1210 GRT32ER61E226KE13L MuRata 2
C8 33µF CAP, AL, 33 µF, 100 V, ±20%, 0.7 ohm,
AEC-Q200 Grade 2, SMD SMT Radial G EEE-FK2A330P Panasonic 1
C9, C10 2.2µF CAP, CERM, 2.2 µF, 100 V, ±10%, X7R,
AEC-Q200 Grade 1 CGA6N3X7R2A225K230 AB TDK 2
C11 56pF CAP, CERM, 56 pF, 50 V, ±5%, C0G/NP0 0603 C0603C560J5GACTU Kemet 1
C16, C17,
C18 4.7µF CAP, CERM, 4.7 µF, 100 V, ±10%, X7S, AEC-Q200 Grade 1, 1210 1210 CGA6M3X7S2A475K200 AB TDK 3
J2, J3 Terminal Block, 3.5mm Pitch, 2x1, TH 7.0 × 8.2 ×
6.5mm ED555/2DS On-Shore Technology 2
J6 Header, 100mil, 2x1, Gold, TH 2×1 Header TSW-102-07-G-S Samtec 1
L1 68µH Inductor, Shielded Drum Core, Ferrite, 68
µH, 1.8 A, 0.17 ohm, AEC-Q200 Grade 1 MSS1246T MSS1246T-683MLB Coilcraft 1
Inductor, Shielded Drum Core, Ferrite, 68
µH, 2.1 A, 0.11 ohm, AEC-Q200 Grade 1 SRR1260A SRR1260A-680M Bourns
Inductor, Shielded, 68uH, 1.9A, 0.11ohm
AEC-Q200 Grade 1 7447714680 7447714680 Wurth
Inductor, Shielded, Powdered Iron, 68uH,
2.3 A, 0.18 ohm MPT1040-H1 MPT1040-680H1 Delta
L2 15µH Inductor, Shielded Drum Core, Ferrite, 15
µH, 1.8 A, 0.05 ohm, AEC-Q200 Grade 3 MSS7341 MSS7341T-153MLB Coilcraft 1
Inductor, Shielded Drum Core, Ferrite, 15
µH, 1.5 A, 0.1 ohm, AEC-Q200 Grade 1 744778115 744778115 Wurth
L3 2000 ΩFerrite Bead, 2000 Ω@ 100 MHz, 1.2 A 1210 FBMH3225HM202NT Taiyo
Yuden 1
R2 0 RES, 0, 5%, 0.063 W, AEC-Q200 Grade 0 0402 CRCW04020000Z0ED Vishay 1
R4, R6 453k RES, 453 k, 1%, 0.1 W, 0603 0603 RC0603FR-07453KL Yageo 2
R5 1.00Meg RES, 1.00 M, 1%, 0.1 W, 0603 0603 RC0603FR-071ML Yageo 1
R7 332k RES, 332 k, 1%, 0.1 W, 0603 0603 RC0603FR-07332KL Yageo 1
R8 105k RES, 105 k, 0.1%, 0.1 W, 0603 0603 RG1608P-1053-B-T5 Susumu
Co Ltd 1
R9 49.9k RES, 49.9 k, 0.1%, 0.1 W, 0603 0603 RG1608P-4992-B-T5 Susumu
Co Ltd 1
R10 100k RES, 100 k, 1%, 0.1 W, 0402 0402 ERJ-2RKF1003X Panasonic 1
SH-J4 1x2 Shunt, 100mil, Gold plated, Black Shunt SNT-100-BK-G Samtec 1
TP1, TP6 Test Lead clips and hooks, SMT Test Point S1751-46 Harwin 2
TP2, TP3,
TP4, TP5 Triple Terminal, Turret, TH, Triple 1598-2 Keystone 4
U1 100-V, Low IQSynchronous Buck Converter SO-8 LM5164QDDARQ1 TI 1

Output Current (A)
Output Voltage (V)
0 0.2 0.4 0.6 0.8 1
11.6
11.7
11.8
11.9
12
12.1
12.2
12.3
12.4
VIN = 15V
VIN = 24V
VIN = 36V
VIN = 48V
VIN = 60V
Load (A)
Efficiency (%)
0.001 0.01 0.1 1
30
40
50
60
70
80
90
100
VIN = 14V
VIN = 24V
VIN = 48V
VIN = 72V
Load (A)
Efficiency (%)
0 0.2 0.4 0.6 0.8 1
60
70
80
90
100
VIN = 14V
VIN = 24V
VIN = 48V
VIN = 72V
Performance Curves www.ti.com
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LM5164-Q1 EVM User Guide
8 Performance Curves
Figure 9. Efficiency Performance (Log Scale) Figure 10. Efficiency Performance (Linear Scale)
Figure 11. Load and Line Regulation Performance
VVIN = 24 V Load = 0.25 A to 1 A, 0.1A/µs
Figure 12. Load Transient Response
VVIN = 24 V Load = 0 A
Figure 13. No Load Start-up with VIN
VVIN = 24 V Load = 1 A
Figure 14. Full Load Start-up with VIN

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LM5164-Q1 EVM User Guide
VVIN = 24 V Load = 0 A
Figure 15. No Load Start-up with EN/UVLO
VVIN = 24 V Load = 1 A
Figure 16. Full Load Start-up/Shutdown with EN/UVLO
VVIN = 24 V Load = 0 A
Figure 17. EN/UVLO Start-up in Prebias
VVIN = 24 V Load = 0 A to short
Figure 18. Short Circuit
VVIN = 24 V Load = Short to 0 A
Figure 19. Short-Circuit Recovery
VVIN = 24 V Load = 0 A to Short to 0 A
Figure 20. No-Load/Short Circuit and Short-Circuit
Recovery

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Figure 21. No-Load Switching Figure 22. Full-Load Switching
VVIN = 24 V Load = 1 A
Figure 23. Thermal Performance
VVIN = 48 V Load = 1 A
Figure 24. Thermal Performance

S t a r t 3 0 M H z S t o p 1 0 8 M H z
Peak
Average
S t a r t 150 k H z S t o p 3 0 M H z
Peak
Average
S t a r t 150 k H z S t o p 3 0 M H z
Peak
Average
S t a r t 3 0 M H z S t o p 1 0 8 M H z
Peak
Average
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VIN = 48 V Load = 1 A R1= 1 Ω, C2= 680 pF
Figure 25. CISPR 25 Class 5 Conducted Emissions Plot,
150 kHz to 30 MHz
VIN = 48 V Load = 1 A R1= 1 Ω, C2= 680 pF
Figure 26. CISPR 25 Class 5 Conducted Emissions Plot,
30 MHz to 108 MHz
VIN = 24 V Load = 1 A R1= 1 Ω, C2= 680 pF
Figure 27. CISPR 25 Class 5 Conducted Emissions Plot,
150 kHz to 30 MHz
VIN = 24 V Load = 1 A R1= 1 Ω, C2= 680 pF
Figure 28. CISPR 25 Class 5 Conducted Emissions Plot,
30 MHz to 108 MHz

Revision History www.ti.com
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Revision History
Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Original (September 2018) to A Revision ............................................................................................... Page
• Updated EVM schematic ............................................................................................................... 10
• Cleaned up BOM, added second sources............................................................................................ 13
• Added CISPR 25 EMI figures .......................................................................................................... 14

STANDARD TERMS FOR EVALUATION MODULES
1. Delivery: TI delivers TI evaluation boards, kits, or modules, including any accompanying demonstration software, components, and/or
documentation which may be provided together or separately (collectively, an “EVM” or “EVMs”) to the User (“User”) in accordance
with the terms set forth herein. User's acceptance of the EVM is expressly subject to the following terms.
1.1 EVMs are intended solely for product or software developers for use in a research and development setting to facilitate feasibility
evaluation, experimentation, or scientific analysis of TI semiconductors products. EVMs have no direct function and are not
finished products. EVMs shall not be directly or indirectly assembled as a part or subassembly in any finished product. For
clarification, any software or software tools provided with the EVM (“Software”) shall not be subject to the terms and conditions
set forth herein but rather shall be subject to the applicable terms that accompany such Software
1.2 EVMs are not intended for consumer or household use. EVMs may not be sold, sublicensed, leased, rented, loaned, assigned,
or otherwise distributed for commercial purposes by Users, in whole or in part, or used in any finished product or production
system.
2Limited Warranty and Related Remedies/Disclaimers:
2.1 These terms do not apply to Software. The warranty, if any, for Software is covered in the applicable Software License
Agreement.
2.2 TI warrants that the TI EVM will conform to TI's published specifications for ninety (90) days after the date TI delivers such EVM
to User. Notwithstanding the foregoing, TI shall not be liable for a nonconforming EVM if (a) the nonconformity was caused by
neglect, misuse or mistreatment by an entity other than TI, including improper installation or testing, or for any EVMs that have
been altered or modified in any way by an entity other than TI, (b) the nonconformity resulted from User's design, specifications
or instructions for such EVMs or improper system design, or (c) User has not paid on time. Testing and other quality control
techniques are used to the extent TI deems necessary. TI does not test all parameters of each EVM.
User's claims against TI under this Section 2 are void if User fails to notify TI of any apparent defects in the EVMs within ten (10)
business days after delivery, or of any hidden defects with ten (10) business days after the defect has been detected.
2.3 TI's sole liability shall be at its option to repair or replace EVMs that fail to conform to the warranty set forth above, or credit
User's account for such EVM. TI's liability under this warranty shall be limited to EVMs that are returned during the warranty
period to the address designated by TI and that are determined by TI not to conform to such warranty. If TI elects to repair or
replace such EVM, TI shall have a reasonable time to repair such EVM or provide replacements. Repaired EVMs shall be
warranted for the remainder of the original warranty period. Replaced EVMs shall be warranted for a new full ninety (90) day
warranty period.
WARNING
Evaluation Kits are intended solely for use by technically qualified,
professional electronics experts who are familiar with the dangers
and application risks associated with handling electrical mechanical
components, systems, and subsystems.
User shall operate the Evaluation Kit within TI’s recommended
guidelines and any applicable legal or environmental requirements
as well as reasonable and customary safeguards. Failure to set up
and/or operate the Evaluation Kit within TI’s recommended
guidelines may result in personal injury or death or property
damage. Proper set up entails following TI’s instructions for
electrical ratings of interface circuits such as input, output and
electrical loads.
NOTE:
EXPOSURE TO ELECTROSTATIC DISCHARGE (ESD) MAY CAUSE DEGREDATION OR FAILURE OF THE EVALUATION
KIT; TI RECOMMENDS STORAGE OF THE EVALUATION KIT IN A PROTECTIVE ESD BAG.

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2
3Regulatory Notices:
3.1 United States
3.1.1 Notice applicable to EVMs not FCC-Approved:
FCC NOTICE: This kit is designed to allow product developers to evaluate electronic components, circuitry, or software
associated with the kit to determine whether to incorporate such items in a finished product and software developers to write
software applications for use with the end product. This kit is not a finished product and when assembled may not be resold or
otherwise marketed unless all required FCC equipment authorizations are first obtained. Operation is subject to the condition
that this product not cause harmful interference to licensed radio stations and that this product accept harmful interference.
Unless the assembled kit is designed to operate under part 15, part 18 or part 95 of this chapter, the operator of the kit must
operate under the authority of an FCC license holder or must secure an experimental authorization under part 5 of this chapter.
3.1.2 For EVMs annotated as FCC – FEDERAL COMMUNICATIONS COMMISSION Part 15 Compliant:
CAUTION
This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not
cause harmful interference, and (2) this device must accept any interference received, including interference that may cause
undesired operation.
Changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to
operate the equipment.
FCC Interference Statement for Class A EVM devices
NOTE: This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to part 15 of
the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is
operated in a commercial environment. This equipment generates, uses, and can radiate radio frequency energy and, if not
installed and used in accordance with the instruction manual, may cause harmful interference to radio communications.
Operation of this equipment in a residential area is likely to cause harmful interference in which case the user will be required to
correct the interference at his own expense.
FCC Interference Statement for Class B EVM devices
NOTE: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of
the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential
installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance
with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference
will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which
can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more
of the following measures:
•Reorient or relocate the receiving antenna.
•Increase the separation between the equipment and receiver.
•Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
•Consult the dealer or an experienced radio/TV technician for help.
3.2 Canada
3.2.1 For EVMs issued with an Industry Canada Certificate of Conformance to RSS-210 or RSS-247
Concerning EVMs Including Radio Transmitters:
This device complies with Industry Canada license-exempt RSSs. Operation is subject to the following two conditions:
(1) this device may not cause interference, and (2) this device must accept any interference, including interference that may
cause undesired operation of the device.
Concernant les EVMs avec appareils radio:
Le présent appareil est conforme aux CNR d'Industrie Canada applicables aux appareils radio exempts de licence. L'exploitation
est autorisée aux deux conditions suivantes: (1) l'appareil ne doit pas produire de brouillage, et (2) l'utilisateur de l'appareil doit
accepter tout brouillage radioélectrique subi, même si le brouillage est susceptible d'en compromettre le fonctionnement.
Concerning EVMs Including Detachable Antennas:
Under Industry Canada regulations, this radio transmitter may only operate using an antenna of a type and maximum (or lesser)
gain approved for the transmitter by Industry Canada. To reduce potential radio interference to other users, the antenna type
and its gain should be so chosen that the equivalent isotropically radiated power (e.i.r.p.) is not more than that necessary for
successful communication. This radio transmitter has been approved by Industry Canada to operate with the antenna types
listed in the user guide with the maximum permissible gain and required antenna impedance for each antenna type indicated.
Antenna types not included in this list, having a gain greater than the maximum gain indicated for that type, are strictly prohibited
for use with this device.