Texas Instruments LM5156EVM-BST User manual

1
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LM5156EVM-BST User's Guide
User's Guide
SNVU696A–February 2020–Revised June 2020
LM5156EVM-BST User's Guide
The LM5156EVM-BST evaluation module showcases the features and performance of the LM5156
device, wide input voltage, non-synchronous boost controller. The standard configuration is designed to
provide a regulate output of 12 V at 36 W from a minimum input of 4 V, switching at a frequency of 440
kHz, withstanding voltage transients from 3 V to 42 V. The module is designed for ease of configuration,
enabling a user to evaluate different applications on the same module. Functionality includes dual random
spread spectrum (DRSS), external clock synchronization, programmable slope compensation, adjustable
soft-start, programmable cycle-by-cycle current limit, and output over voltage protection.
Contents
1 Features and Electrical Performance ..................................................................................... 3
2 Application Schematic....................................................................................................... 5
3 EVM Photo.................................................................................................................... 5
4 Test Setup and Procedure.................................................................................................. 6
5 Test Results .................................................................................................................. 6
6 Design Files................................................................................................................. 12
List of Figures
1 Application Circuit............................................................................................................ 5
2 EVM Photo ................................................................................................................... 5
3 Test Setup.................................................................................................................... 6
4 Efficiency vs Load ........................................................................................................... 7
5 Load Regulation ............................................................................................................. 7
6 Thermal Image VIN = 4 V IOUT = 3 A, No forced air cooling............................................................. 8
7 Steady State, VIN = 4 V, IOUT = 3 A......................................................................................... 9
8 Steady State, VIN = 6 V, IOUT = 3 A......................................................................................... 9
9 Steady State, VIN = 9 V, IOUT = 3 A......................................................................................... 9
10 Steady State, VIN = 10 V, IOUT = 3 A ....................................................................................... 9
11 Start-Up, VIN = 4V, IOUT = 3 A.............................................................................................. 10
12 Start-Up, VIN = 6V, IOUT = 3 A.............................................................................................. 10
13 Start-Up, VIN = 9 V, IOUT = 3 A............................................................................................. 10
14 Start-Up, VIN = 10 V, IOUT = 3 A ........................................................................................... 10
15 Load Transient, VIN = 4 V, IOUT = 1.5 A to 3 A .......................................................................... 11
16 Load Transient, VIN = 6 V, IOUT = 1.5 A to 3 A .......................................................................... 11
17 Load Transient, VIN = 9 V, IOUT = 1.5 A to 3 A .......................................................................... 11
18 Load Transient, VIN = 10 V, IOUT = 1.5 A to 3 A......................................................................... 11
19 Control Loop Response, VIN = 4 V, IOUT = 3 A .......................................................................... 11
20 Control Loop Response, VIN = 9 V, IOUT = 3 A .......................................................................... 11
21 Top Silkscreen.............................................................................................................. 12
22 Top Layer ................................................................................................................... 12
23 Signal Layer 1 .............................................................................................................. 12
24 Signal Layer 2 .............................................................................................................. 12
25 Bottom Layer................................................................................................................ 12
26 Bottom Silkscreen.......................................................................................................... 12

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27 LM5156EVM-BST Schematic............................................................................................. 13
List of Tables
1 Electrical Performance Standard Configuration ......................................................................... 3
2 Jumper Description.......................................................................................................... 4
3 Standard Configuration Jumper Connections............................................................................ 6
4 LM5156EVM-BST Bill of Materials ...................................................................................... 14
5 LM5156EVM-BST Alternate Bill of Materials, fSW = 2.2 MHz ........................................................ 15
Trademarks
All trademarks are the property of their respective owners.

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LM5156EVM-BST User's Guide
1 Features and Electrical Performance
The LM5156EVM-BST supports the following features and performance capabilities:
• Tightly regulated output voltage of 12 V with 1% accurate reference voltage
• High conversion efficiency of > 95% at full load.
• Constant cycle-by-cycle peak inductor current limit over input voltage range
• User adjustable soft-start time using CSS
• Output over-voltage protection
• Multiple BIAS pin and VCC pin connections to test multiple configurations
– BIAS connect to VCC
– BIAS supplied with external power supply
– VCC supplied by external power supply
– BIAS supplied by output voltage
• Power good (PGOOD) indicator with selectable pull-up source
• 440kHz Switching frequency
• External clock synchronization
• Programable slope compensation
1.1 Electrical Parameters
Table 1. Electrical Performance Standard Configuration
Parameter Test Conditions MIN TYP MAX UNIT
INPUT CHARACTERISTICS
Input voltage Range VIN Static, full load operation 4 9 12 V
Transient: (50% load) 3
Input voltage turn on VIN(ON) Initial turn-on 5 V
Input voltage turn off VIN(OFF) Adjusted by the UVLO/SYNC resistors 2.5 V
OUTPUT CHARACTERISTICS
Output Voltage VOUT 12 V
Maximum Output Current IOUT 3 A
Output Over-voltage VOUT_OV 13.22 V
SYSTEM CHARACTERISTICS
Switching frequency 440 kHz
External Clock Synchronization 375 505 kHz
Full load efficiency VIN = 4 V, IOUT = 3 A 95.6 %
Junction Temperature, TJ-40 150 C

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1.2 Configuration Points
Table 2 indicates the available test points and configuration jumpers. These points offer flexibility in
configuring the evaluation module and include but are not limited to;
• BIAS pin to be connected to:
– External supply (VAUX)
– Input voltage (VIN)
– Regulated output voltage (VOUT)
– VCC pin
• PGOOD pin to be supplied by either VCC or VAUX
• External clock synchronization
• Shut-down signal by pulling the UVLO pin low.
Table 2. Jumper Description
Jumper Pin Description
TP1 VIN Positive input voltage sense connection
TP2 SW Probe point for the switch node of the LM5156 boost circuit
TP3 VOUT Positive output voltage sense connection
TP4 VIN- Negative input voltage sense connection
TP5 GND Negative output voltage sense connection
TP6 VCCext Supply VCC from and external supply. Note VCCext must be less than the voltage on the
BIAS pin.
TP7 VAUX Supply the BIAS pin from and external supply. R12 also connect to this rail
TP8 VOUT+ Loop response positive injection point
TP9 VOUT- Loop response negative injection point
TP10 SYNC Input for external clock synchronization
TP11 SD High signal pulls UVLO pin to ground entering shutdown mode
J6 Pin 1 to pin 2 Connect VOUT to the BIAS pin of the LM5156 through D3
Pin 2 to pin 3 Directly connect VOUT to BIAS pin of the LM5156
J7 Pin 1 to pin 2 Connect VIN to the BIAS pin of the LM5156 through D4
Pin 2 to pin 3 Directly connect VIN to BIAS pin of the LM5156
J8 Pin 1 to pin 2 Directly Connect VCC to the BIAS pin
J9 Pin 1 to pin 2 Directly connect VAUX to the BIAS pin
J10 Pin 1 to Pin 2 Disable spread spectrum
Pin 2 to Pin 3 Enable spread spectrum
J11
VCC (Pin 1) Monitor the VCC pin
BIAS-IC (Pin 2) Monitor the BIAS pin
PGOOD (Pin 3) Monitor the PGOOD pin
COMP (Pin 4) Monitor the COMP pin
SS (Pin 5) Monitor the SS pin
UVLO (Pin 6) Monitor the UVLO pin
AGND (Pin 7) Connection to AGND plan

BIAS VCC GATE
CS
GND
FB
COMP
SS
RT
PGOOD
DITHOFF
UVLO/SYNC
VOUT
VIN
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2 Application Schematic
The LM5156EVM-BST is capable of multiple configurations. Figure 1 shows the standard configuration of
the LM5156EVM-BST for which the parameters in Table 1 are valid. Section 4.2 describes the correct
jumper settings and measurement locations recreate the data presented in Section 5.
Figure 1. Application Circuit
3 EVM Photo
Figure 2. EVM Photo

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4 Test Setup and Procedure
4.1 Test Setup
Figure 3 shows the correct jumper positions to configure the evaluation module for the typical application,
as shown in Figure 1. The correct equipment connections and measurement points are shown in Table 3
Table 3. Standard Configuration Jumper Connections
Jumper Position
J6 Jumper from pin 2 to pin 3
Figure 3. Test Setup
4.2 Test Equipment
Power Supply: The input voltage source (VIN) should be a variable supply capable of 0V to 20V and
source at least 15A.
Multi-meters:
• Voltmeter 1: Input voltage, connect from VIN to VIN-
• Voltmeter 2: Output voltage, connect from VOUT to GND
• Ammeter 1: Input current, must be able to handle 15A. Shunt resistor can be used as needed.
• Ammeter 2: Output current, must be able to handle 3A. Shunt resistor can be used as needed.
Electronic Load: The load should be constant resistance (CR) or constant current (CC) capable. It should
safely handle 3A at 12V.
Oscilloscope: 20-MHz bandwidth and AC coupling. Measure the output voltage ripple directly across an
output capacitor with a short ground lead. It is not recommended to use a long-leaded ground connection
due to the possibility of noise being coupled into the signal. To measure other waveforms, adjust the
oscilloscope as needed.
5 Test Results
Figure 4 through Figure 19 present the typical performance of the LM5156EVM-BST according to the
BOM and the configuration described in Section 4. Based on measurement techniques and environmental
variables measurements might differ slightly than the data presented.

IOUT (A)
VOUT (V)
0 0.5 1 1.5 2 2.5 3
11.8
11.9
12
12.1
12.2
VIN = 10V
VIN = 9V
VIN = 6V
VIN = 4V
IOUT (A)
Efficiency (%)
Efficiency
0 0.5 1 1.5 2 2.5 3
50
55
60
65
70
75
80
85
90
95
100
LM51
VIN = 10V
VIN = 9V
VIN = 6V
VIN = 4V
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5.1 Efficiency Curves
Figure 4. Efficiency vs Load
5.2 Load Regulation Curves
Figure 5. Load Regulation

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5.3 Thermal Performance
Figure 6. Thermal Image VIN = 4 V IOUT = 3 A, No forced air cooling

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5.4 Steady State Waveforms
Figure 7. Steady State, VIN = 4 V, IOUT = 3 A Figure 8. Steady State, VIN = 6 V, IOUT = 3 A
Figure 9. Steady State, VIN = 9 V, IOUT = 3 A Figure 10. Steady State, VIN = 10 V, IOUT = 3 A

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5.5 Start-Up Waveforms
Figure 11. Start-Up, VIN = 4V, IOUT = 3 A Figure 12. Start-Up, VIN = 6V, IOUT = 3 A
Figure 13. Start-Up, VIN = 9 V, IOUT = 3 A Figure 14. Start-Up, VIN = 10 V, IOUT = 3 A