Texas Instruments LM63635DNEVM User manual

User’s Guide
LM63635DNEVM EVM User’s Guide
ABSTRACT
The Texas Instruments LM63635DNEVM evaluation module (EVM) helps designers evaluate the operation and
performance of the LM636x5CAQDRRQ1 buck regulator. The LM636x5CAQDRRQ1 is a family of easy-to-use
synchronous step-down DC/DC converters capable of driving up to 3.5 A of load current from an input voltage
of 3.5 V to 36 V. See the LM636x5-Q1 3.5-V to 36-V, 1.5-A, and 2.5-A Automotive Step-down Voltage Converter
Data Sheet for additional features, detailed description, and available options. Please note that this EVM
is designed for the LM636x5CAQDRRQ1. This device has a different pin-out than the other devices in the
LM636x5-Q1 product family.
Table 1-1. Device and Package Configurations
EVM DEVICE OUTPUT
VOLTAGE
OUTPUT
CURRENT
SWITCHING
FREQUENCY PACKAGE
LM63635DNEVM LM63635CAQDRRQ1 5 V 3.25 A 2.1 MHz DRR0012
(WSON)
Figure 1-1. LM63635DNEVM Board Image
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Table of Contents
1 Setup........................................................................................................................................................................................3
2 Operation.................................................................................................................................................................................6
3 Performance Curves...............................................................................................................................................................6
4 Schematic................................................................................................................................................................................7
5 Board Layout...........................................................................................................................................................................8
6 Bill of Materials..................................................................................................................................................................... 10
List of Figures
Figure 1-1. LM63635DNEVM Board Image.................................................................................................................................1
Figure 1-1. EVM Board Connections........................................................................................................................................... 3
Figure 1-2. EVM Card Edge Connections................................................................................................................................... 4
Figure 1-3. Jumper Locations...................................................................................................................................................... 4
Figure 1-4. FRA Setup.................................................................................................................................................................5
Figure 3-1. Efficiency: AUTO Mode, VOUT = 5 V, fSW = 2100 kHz............................................................................................... 6
Figure 3-2. Line and Load Regulation: AUTO Mode, VOUT = 5 V, fSW = 2100 kHz......................................................................6
Figure 4-1. LM63635DNEVM Schematic.....................................................................................................................................7
Figure 5-1. Top View of EVM....................................................................................................................................................... 8
Figure 5-2. Bottom View of EVM..................................................................................................................................................8
Figure 5-3. EVM Top Copper Layer............................................................................................................................................. 9
Figure 5-4. EVM Mid Layer One.................................................................................................................................................. 9
Figure 5-5. EVM Mid Layer Two.................................................................................................................................................. 9
Figure 5-6. EVM Bottom Copper Layer....................................................................................................................................... 9
List of Tables
Table 1-1. Device and Package Configurations...........................................................................................................................1
Table 6-1. BOM for LM63625DNEVM........................................................................................................................................10
Trademarks
All trademarks are the property of their respective owners.
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1 Setup
This section describes the test points and connectors on the EVM and how to properly connect, set up, and use
the LM63635DNEVM. Either the banana jacks on the top of the board or the card edge connector can be used
for connections. See Figure 1-1 for the top of board connections and Figure 1-2 for the card edge connections.
See the LM636x5-Q1 3.5-V to 36-V, 1.5-A, and 2.5-A Automotive Step-down Voltage Converter Data Sheet for
details. The following lists the functions of the connections:
VINEMI Input supply to EVM. Connect to a suitable input supply.
GND System ground.
VOUT Output of EVM. Connect to desired load.
VOS Output voltage sense connection (do not use for power; sense only).
VIS Input voltage sense connection (do not use for power; sense only).
GNDS Ground sense point for analog measurements (do not use for power; sense only).
LOAD
Input Power
Supply
Output
Voltage
DMM
Input Voltage
DMM
(+)
(-)
(+)
(-)
(+)
(-)
(+)
(-)
Figure 1-1. EVM Board Connections
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GND VOUT
GNDS
VOS
TOP FRONT
BOTTOM FRONT
VIS
VINEMI
INPUT
SUPPLY LOAD
(+) (-) (-) (+)
(+)
(-)
DMM
DMM
(-)(+)
(+) (-)
CM Choke
Input *
* = Optional Connections
Input
Voltage
Output
Voltage
Figure 1-2. EVM Card Edge Connections
1.1 Jumpers
See Figure 1-3 for jumper locations.
MODE This jumper allows the selection of either AUTO mode or FPWM mode. In addition, by removing this
jumper and supplying a clock signal to the SYNC/MODE test point, the device can by synchronized to
an external clock.
EN This jumper turns the device on or off. In addition, by removing this jumper and supplying a signal to the
EN test point, the device can be controlled externally.
Mode Selec on
Jumper
EN Control
Jumper
Figure 1-3. Jumper Locations
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1.2 Test Points
•VINEMI - Input supply to EVM. Connect to a suitable input supply.
•GND - System power ground.
•VOUT - Power output of EVM. Connect to desired load.
•VOS - Output voltage sense connection. Connect to DMM.
•VINS - Input voltage sense connection. Connect to DMM.
•GNDS - Ground sense point for analog measurements. Connect to DMM.
•EN - Connected to the EN input of the device.
•RESET - Connected to the RESET pin of the IC. It is used as a flag output. The reset function can be
monitored at this test point.
•SYNC/MODE - Connected to the SYNC/MODE pin of the IC.
•VCC - Connected to the VCC output of the device. Can be used for logic level pullups, if needed.
•OPEN PADS - Connections for frequency response analyzer (on bottom of board) to take Bode plots. See
Figure 1-4 for details of connections.
B
Signal
Injection
^_/v‰µšš}
network analyzer
^_/v‰µšš}
network analyzer
A
Figure 1-4. FRA Setup
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2 Operation
Once the above connections are made and the appropriate jumpers are set, the EVM is ready to use.
The EVM is configured for a 5-V output. The output voltage can be changed by changing the values of
resistors R2 (RFBT) and or R3 (RFBB). Depending on the output capacitors and the desired loop performance, a
feed-forward capacitor, C5 (CFF) can be desirable. A space is available on the EVM for this optional component.
See the LM636x5-Q1 3.5-V to 36-V, 1.5-A, and 2.5-A Automotive Step-down Voltage Converter Data Sheet for
more information.
The switching mode of the EVM can be changed by using the MODE jumper; this selection can be made
on-the-fly.
The RESET flag is used to indicate when the output voltage is within +/- 5 % of the regulated value. This EVM is
configured with a 100 kΩ pull-up resistor from RESET to VCC (about 5V). A low on RESET indicates the output
voltage is out of regulation. The pull-up resistor can be removed and the open-drain RESET pin can be used to
control a system processor from the EVM. Be sure to limit the voltage on the RESET to less than the specified
Abs max for this pin.
Some components in the EMI filter are not populated. The user is free to experiment with different EMI filter
components as desired.
Loop gain measurements (Bode plots) can be made using the setup shown in Figure 1-4.
The EVM has been designed for maximum flexibility regarding component selection. This allows the user to
place preferred components such as the inductor, the capacitors, or both, on the board and test the performance
of the regulator. This way the power supply system can be tested before committing the design to production.
3 Performance Curves
Curves showing typical performance data are found in Figure 3-1and Figure 3-2. For other conditions and/or
other data, consult the device data sheet.
Output Current (A)
Efficiency (%)
0 0.5 1 1.5 2 2.5 3
60
65
70
75
80
85
90
95
8V
13.5V
18V
24V
Figure 3-1. Efficiency: AUTO Mode, VOUT = 5 V, fSW
= 2100 kHz
Output Current (A)
Output Voltage (V)
0 0.5 1 1.5 2 2.5 3
5
5.01
5.02
5.03
5.04
5.05
8V
13.5V
18V
24V
Figure 3-2. Line and Load Regulation: AUTO Mode,
VOUT = 5 V, fSW = 2100 kHz
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4 Schematic
Figure 4-1. LM63635DNEVM Schematic
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5 Board Layout
CAUTION
Caution Hot surface.
Contact may cause burns.
Do not touch.
Figure 5-1. Top View of EVM
Figure 5-2. Bottom View of EVM
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Figure 5-3. EVM Top Copper Layer Figure 5-4. EVM Mid Layer One
Figure 5-5. EVM Mid Layer Two Figure 5-6. EVM Bottom Copper Layer
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6 Bill of Materials
Table 6-1. BOM for LM63625DNEVM
DESIGNATOR COMMENT DESCRIPTION MANUFACTURER PART NUMBER QUANTITY
C1 CB CAP, CERM, 0.22 µF, 16 V,+/- 10%, X7R, AEC-Q200
Grade 1, 0603 Samsung CL10B224KO8VPNC 1
C2,C3 CO1,CO2 CAP, CERM, 22 uF, 25 V, +/- 20%, X7R, 1210 Taiyo Yuden TMK325B7226MM-TR 2
C6 CVCC CAP, CERM, 1 µF, 16 V,+/- 10%, X7R, AEC-Q200
Grade 1, 0603 Taiyo Yuden EMK107B7105KAHT 1
C7,C14 CINHF,COUTHF CAP, CERM, 0.22 uF, 50 V, +/- 10%, X7R, AEC-Q200
Grade 1, 0603 TDK CGA3E3X7R1H224K080AB 2
C8,C9,C13 CIN1,CIN2,CF2 CAP, CERM, 4.7 µF, 50 V,+/- 10%, X7R, AEC-Q200
Grade 1, 1206 TDK CGA5L3X7R1H475K160AE 3
C10 CBLK CAP, AL, 47 uF, 63 V, +/- 20%, AEC-Q200 Grade 2,
SMD Panasonic EEE-HA1J470UP 1
C11,C12 CF1,CF3 CAP, CERM, 1 µF, 50 V,+/- 10%, X7R, AEC-Q200
Grade 1, 1206 Taiyo Yuden UMK316B7105KLHT 2
J1, J2 EN, SYNC/MODE Header, 100mil, 3x1, Gold, TH Samtec HTSW-103-07-G-S 2
J3, J4,J5 VOUT, VIN, GND Standard Banana Jack, Uninsulated, 8.9mm Keystone 575-8 3
L1 L1 Inductor, Shielded, Composite, 2.2 uH, 6.1 A, 0.0201
ohm, AEC-Q200 Grade 1, SMD Coilcraft XEL4030-222MEB 1
L2 Lf2 Inductor, Shielded, Metal Composite, 4.7 uH, 2.9 A,
0.076 ohm, SMD Wurth Elektronik 74438356047 1
L3 Lf1 Ferrite Bead, 600 Ω at 100 MHz, 3 A, 1210 Taiyo Yuden FBMH3225HM601NT 1
L4 L4 Coupled inductor, 0.015 Ω, AEC-Q200 Grade 1, SMD TDK ACM70V-701-2PL-TL00 0
R1 RINJ RES, 49.9, 1%, 0.1 W, AEC-Q200 Grade 0, 0603 Vishay-Dale CRCW060349R9FKEA 1
R2,R4 RFBT,RPU RES, 100 k, 1%, 0.1 W, AEC-Q200 Grade 0, 0603 Vishay-Dale CRCW0603100KFKEA 2
R3 RFBB RES, 24.9 k, 1%, 0.1 W, 0603 Yageo RC0603FR-0724K9L 1
TP1, TP2, TP3,
TP4, TP5, TP6,
TP7, TP8, TP9,
TP10,TP11,TP12
VINS, VOUTS, VIN_EMI,
EN, VOUT, GND,
TPGND2, TPGND1,
GNDS, RESET, SYNC
Terminal, Turret, TH, Double Keystone 1593-2 12
SH-J1, SH-J2 EN, SYNC/MODE Shunt, 100mil, Gold plated, Black Samtec SNT-100-BK-G 2
U1 LM63635CAQDRRRDN 3.5-V to 36-V, Automotive Step-down Voltage
Converter Texas Instruments LM63635CAQDRRRDN 1
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