Texas Instruments TPS53513 User manual

User’s Guide
TPS53513 Step-Down Converter Evaluation Module User's
Guide
Table of Contents
1 Introduction.............................................................................................................................................................................2
2 Description.............................................................................................................................................................................. 2
2.1 Typical Applications............................................................................................................................................................2
2.2 Features............................................................................................................................................................................. 2
3 Electrical Performance Specifications................................................................................................................................. 2
4 Schematic................................................................................................................................................................................3
5 Test Setup................................................................................................................................................................................4
5.1 Test Equipment.................................................................................................................................................................. 4
5.2 Recommended Test Setup.................................................................................................................................................5
6 Configurations........................................................................................................................................................................ 6
6.1 Switching Frequency Selection.......................................................................................................................................... 6
6.2 Mode Selection.................................................................................................................................................................. 6
6.3 VDD Pin Supply Selection..................................................................................................................................................6
7 Test Procedure........................................................................................................................................................................ 7
7.1 Line/Load Regulation and Efficiency Measurement Procedure......................................................................................... 7
7.2 Control Loop Gain and Phase Measurement Procedure................................................................................................... 7
7.3 List of Test Points............................................................................................................................................................... 8
7.4 Equipment Shutdown......................................................................................................................................................... 8
8 EVM Assembly Drawing and PCB Layout............................................................................................................................ 9
9 List of Materials.....................................................................................................................................................................13
10 Revision History................................................................................................................................................................. 14
Trademarks
D-CAP3™ is a trademark of Texas Instruments.
All trademarks are the property of their respective owners.
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TPS53513 Step-Down Converter Evaluation Module User's Guide 1
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1 Introduction
The TPS53513EVM-PWR587 evaluation module (EVM) uses the TPS53513 device. The TPS53513 device is a
D-CAP3™ mode, 8-A synchronous buck converter with integrated MOSFETs. The device provides a fixed 1.2-V
output at up to 8 A from a 12-V input bus.
2 Description
The TPS53513EVM-PWR587 is designed to use a regulated 12-V bus to produce a regulated 1.2-V output at
up to 8 A of load current. The TPS53513EVM-PWR587 is designed to demonstrate the TPS53513 device in
a typical low voltage application while providing a number of test points to evaluate the performance of the
TPS53513 device.
2.1 Typical Applications
• Server and storage
• Workstations and desktops
• Telecommunication infrastructure
2.2 Features
The TPS53513EVM- PWR587 features:
• 8-A DC steady-state output current
• Support pre-bias output voltage start-up
• J2 for enable function
• J5 for auto-skip and forced CCM selection
• J7 for extra 5-V input for further power saving purpose
• Convenient test points for probing critical waveforms
3 Electrical Performance Specifications
Table 3-1. TPS53513EVM-PWR587 Electrical Performance Specifications(1)
PARAMETER TEST CONDITIONS MIN TYP MAX UNITS
Input Characteristic
Voltage range VIN 5 12 18 V
Maximum input current VIN = 5 V, IO = 8 A 2.5 A
No load input current VIN = 12 V, IO = 0 A with auto skip mode 1 mA
Output Characteristics
Output voltage VOUT 1.2 V
Output voltage regulation Line regulation, VIN = 5 V – 14 V with FCCM 0.2%
Load regulation, VIN = 12 V, IO = 0 A – 8 A with FCCM 0.5%
Output voltage ripple VIN = 12 V, IO = 8 A with FCCM 10 mVPP
Output load current 0 8 A
Output over current 11
Soft start 1 mS
Systems Characteristics
Switching frequency 1000 kHz
Peak efficiency VIN = 12 V, 1.2 V / 4 A 88.5%
Full load efficiency VIN = 12 V, 1.2 V / 8 A 86.9%
Operating temperature 25 °C
(1) Jumpers set to default locations. See Section 6.
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4 Schematic
Output: 1.2 V / 0-8 A
Figure 4-1. TPS53513EVM-PWR587 Schematic
www.ti.com Schematic
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5 Test Setup
5.1 Test Equipment
Voltage Source: The input voltage source VIN must be a 0-V to 14-V variable DC source capable of supplying
10 ADC. Connect VIN to J1 as shown in Figure 5-2.
Multimeters:
•V1: VIN at TP1 (VIN) and TP4 (GND)
•V2: VOUT at TP7 (VOUT) and TP9 (GND)
Output Load: The output load must be an electronic constant resistance mode load capable of 15 ADC at 1.2 V.
Oscilloscope: A digital or analog oscilloscope can be used to measure the output ripple. The oscilloscope
should be set for the following:
• 1-MΩ impedance
• 20-MHz bandwidth
• AC coupling
• 1-µs/div horizontal resolution
• 20-mV/div vertical resolution
Test points TP7 and TP9 can be used to measure the output ripple voltage by placing the oscilloscope probe tip
through TP7 and holding the ground barrel on TP9 as shown in Figure 5-1. Using a leaded ground connection
may induce additional noise due to the large ground loop.
T 9P
T 7P
Metal Ground Barrel
Probe Tip
Figure 5-1. Tip and Barrel Measurement for VOUT Ripple
Recommended Wire Gauge:
•VIN to J1 (12V input): The recommended wire size is 1× AWG #14 per input connection, with the total length
of wire less than four feet (two feet input, two feet return).
•J3 to LOAD: The minimum recommended wire size is 2× AWG #14, with the total length of wire less than
four feet (two feet output, two feet return).
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5.2 Recommended Test Setup
Figure 5-2. TPS53513EVM-587 Top Layer for Test Setup
5.2.1 Input Connections
1. Prior to connecting the DC input source (VIN), it is advisable to limit the source current from VIN to 10 A
maximum. Make sure VIN is initially set to 0 V and connected as shown in Figure 5-2.
2. Connect a voltmeter V1 at TP1 (VIN) and TP2 (GND) to measure the input voltage.
5.2.2 Output Connections
1. Connect Load to J3 and set load to constant resistance mode to sink 0 ADC before VIN is applied.
2. Connect a voltmeter V2 at TP7 (VOUT) and TP9 (GND) to measure the output voltage.
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6 Configurations
All jumper selections should be made prior to applying power to the EVM. The user can configure this EVM per
the following configurations.
6.1 Switching Frequency Selection
Switching frequency can be changed according to Table 6-1.
Default setting: 1 MHz
Table 6-1. Switching Frequency
SWITCHING FREQUENCY
(FSW)(KHZ)
RESISTOR DIVIDER
RATIO (RDR)
EXAMPLE RF FREQUENCY COMBINATIONS
RRF_H (kΩ) RRF_L (kΩ)
1000 > 0.557 1 300
850 0.461 180 154
750 0.375 200 120
600 0.297 249 105
500 0.229 240 71.5
400 0.16 249 47.5
300 0.096 255 27
250 < 0.041 270 11.5
For different switching frequency settings, change R3 and R4 according to Table 6-1.
6.2 Mode Selection
The MODE can be set by J5.
Default setting: FCCM
Table 6-2. MODE Selection
JUMPERS SET TO: MODE SELECTION
1-2 pin shorted FCCM with 2× RC time constant
3-4 pin shorted Forced CCM(1) with 1× RC time constant
5-6 pin shorted Forced CCM(1) with 2× RC time constant
7-8 pin shorted Auto-Skip Mode with 2× RC time constant
9-10 pin shorted Auto-Skip Mode with 1× RC time constant
(1) Device goes into FCCM after PGOOD becomes high.
6.3 VDD Pin Supply Selection
The controller can be enabled and disabled by J7.
Default setting: VDD pin connected to VIN pins through R19
Table 6-3. The Controller Can Be Enabled and Disabled by J7(1)
SET ON CONNECTION ENABLE SELECTION
R19 = 0 Ω VDD pin connected to VIN pins
R19 = Open VDD pin disconnected to VIN pins
(1) J7 requires the proper input voltage for power up. The VDD pin input voltage range is from 4.5 V to 25 V.
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7 Test Procedure
7.1 Line/Load Regulation and Efficiency Measurement Procedure
1. Set up the EVM as described in Section 5 and Figure 5-2.
2. Ensure the load is set to constant resistance mode and to sink 0 ADC.
3. Ensure all jumpers set per Section 6.
4. Ensure the jumper provided in the EVM shorts on J2 before VIN is applied.
5. Increase VIN from 0 V to 12 V. Using V1 to measure input voltage.
6. Remove the jumper on J2 to enable the controller.
7. Use V2 to measure VOUT voltage.
8. Vary load from 0 ADC to 10 ADC, VOUT must remain in load regulation.
9. Vary VIN from 8 V to 14 V, VOUT must remain in line regulation.
10. Put the jumper on J2 to disable the converter.
11. Decrease load to 0 A.
12. Decrease VIN to 0 V.
7.2 Control Loop Gain and Phase Measurement Procedure
The TPS53513EVM-PWR587 contains a 10-Ω series resistor in the feedback loop for loop response analysis.
1. Set up the EVM as described in Section 5 and Figure 5-2.
2. Connect the isolation transformer to test points marked TP5 and TP8.
3. Connect input signal amplitude measurement probe (channel A) to TP10. Connect the output signal
amplitude measurement probe (channel B) to TP11.
4. Connect ground lead of channel A and channel B to TP15.
5. Inject around 20-mV or less signal through the isolation transformer.
6. Sweep the frequency from 100 Hz to 1 MHz with 10 Hz or lower post filter. The control loop gain and phase
margin can be measured.
7. Disconnect the isolation transformer from bode plot test points before making other measurements (signal
injection into feedback may interfere with accuracy of other measurements).
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7.3 List of Test Points
Table 7-1. Test Point Functions
TEST POINTS NAME DESCRIPTION
TP1 VIN Converter input supply voltage
TP2 VREG LDO voltage
TP3 PGood Power good output
TP4 PGND Power ground
TP5 CHB Input B for loop injection
TP6 SW Switching node
TP7 VOUT VOUT terminal +
TP8 CHA Input A for loop injection
TP9 PGND Power ground
TP10 RF RF pin
TP11 TRIP TRIP pin
TP12 EN Enable pin
TP13 VDD VDD pin
TP14 MODE Mode pin
TP15 AGND Analog ground
7.4 Equipment Shutdown
1. Shut down load
2. Shut down VIN
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8 EVM Assembly Drawing and PCB Layout
The following figures (Figure 8-1 through Figure 8-8) show the design of the TPS53513EVM-PWR587 printed
circuit board. The EVM has been designed using 4 Layers, 2-oz copper circuit board.
Figure 8-1. TPS53513EVM-587 Top Layer Assembly Drawing
Figure 8-2. TPS53513EVM-587 Bottom Assembly Drawing
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Figure 8-3. TPS53513EVM-587 Top Copper
Figure 8-4. TPS53513EVM-587 Layer 2 Copper
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