Texas Instruments TPS53515 User manual

User’s Guide

TPS53515 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 and 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 Bill of Materials..................................................................................................................................................................... 13

10 Revision History................................................................................................................................................................. 14

www.ti.com Table of Contents

SLUUAS1C – OCTOBER 2013 – REVISED NOVEMBER 2021

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TPS53515 Step-Down Converter Evaluation Module User's Guide 1

1 Introduction

The TPS53515EVM-PWR587 evaluation module (EVM) uses the TPS53515 device. The TPS53515 device is a

D-CAP3™ mode, 12-A synchronous buck-converter with integrated MOSFETs. The device provides a fixed 1.2-V

output at up to 12 A from a 12-V input bus.

2 Description

The TPS53515EVM-PWR587 is designed for a regulated 12-V bus to produce a regulated 1.2-V output at up to

12 A of load current. The TPS53515EVM-PWR587 is designed to demonstrate the TPS53515 device in a typical

low-voltage application while providing a number of test points to evaluate the performance of the TPS53515

device.

2.1 Typical Applications

• Servers and storage

• Workstations and desktops

• Telecommunication infrastructure

2.2 Features

The TPS53515EVM-PWR587 features include the following:

• 12-A DC steady-state output current

• Support for a prebias-output voltage at startup

• Jumper, J2, for enable function

• Jumper, J5, for auto-skip and forced-continuous-conduction-mode (FCCM) selection

• Jumper, 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. TPS53515EVM-PWR587 Electrical Performance Specifications(1)

PARAMETER TEST CONDITIONS MIN TYP MAX UNITS

Input Characteristics

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 12 A

Output over current 15 A

Soft-start 1 ms

Systems Characteristics

Switching frequency VIN = 12 V, 1.2 V / 4 A 1000 kHz

Peak efficiency VIN = 12 V, 1.2 V / 8 A 88.5 %

Full load efficiency 86.9 %

Operating temperature 25 °C

(1) Jumpers set to default locations, See Section 6.

Introduction www.ti.com

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4 Schematic

CLK

DATA

VREG

ALERT#

OPEN= ENABLE

VIN

PGND

VOUT

PGND

PGOOD

ADDR/RF

TRIP

AGND

VDD

MODE

CHB CHA

Bus C

onnector

Input: 8-

14V

Output: 1.2V/0-12A

Ext. VDD

LabView

onnector

300k

1.00k

PEC02SAAN

PEC05DAAN

DNP

R14

100k

3.01

22uF

0.1uF

100k

57.6k

R10

22uF

0.1uF

TP1

TP4

TP7

TP9

TP3

TP6

TP2

R15

C15

DNP

C16

DNP

C17

DNP

R19

1uF

C18

1uF

C20

10.0k

R20

10.0k

R21

R22

PEC05DAAN

20.0kR11

150kR12

150kR13

TP5 TP8

TP10

TP11

TP12

22uF

C10

22uF

C11

22uF

C12

22uF

C13

22uF

C14

22uF

C19

22uF

C21

22uF

C22

22uF

C23

ED120/2

TP13

200k

122

.0 uH

DNP

L1A

DNP

TP14

TP15

470pF

ADDR/RF

PGOOD

VBST

PGND 10

PGND 11

PGND 12

PGND 13

PGND 14

VIN 15

VIN 16

VIN 17

NC 18

VDD 19

VREG 20

MODE 21

AGND 22

FB 23

TRIP

TPS53515RVE

1uF

C25

1uF

C26

PEC05DAAN

R16

ED555/2

C24

DNP

C27

DNP

VDD_19

VREG

VIN

VOUT

VDD

MODE

PGOOD

AGND

VIN

VOUT

PGND

AGND

PGND

EG PGND

VOUT

PGND

MODE

AGND

PGOOD

VOUT

VDD

PGOOD

VOUT

VIN

VDD

PGND

TPS53513

NOTES:

PIN 26

PIN 27

PIN 28

TPS53515TPS53915

ALERT#

SDA

SCL

GND1

GND2

GND1

GND2

VARIANT PINOUT FOR U1

TABLE 1

Figure 4-1. TPS53515EVM-PWR587 Schematic

www.ti.com Schematic

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TPS53515 Step-Down Converter Evaluation Module User's Guide 3

5 Test Setup

5.1 Test Equipment

Oscilloscope A digital or analog oscilloscope measures the output ripple. The oscilloscope must be set for

the following: 1-MΩ impedance, 20-MHz bandwidth, AC coupling, 1-µs / division horizontal

resolution, 20-mV / division vertical resolution. Test points TP7 and TP9 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 can induce additional noise

due to the large ground loop.

Voltage Source The input voltage source VIN must be a 0 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 an electronic constant-resistance-mode load capable of 0 to 15 ADC at

1.2 V.

T 9P

T 7P

Metal Ground Barrel

Probe Tip

Figure 5-1. Tip and Barrel Measurement for VOUT Ripple

Recommended Wire Gauge:

1. VIN to J1 (12-V input)

• The recommended wire size is 1× AWG number 14 per input connection, with the total length of wire less

than 4 feet (2 feet input, 2 feet return).

2. J3 to LOAD

• The minimum recommended wire size is 2× AWG number 14, with the total length of wire less than 4 feet

(2 feet output, 2 feet return).

Test Setup www.ti.com

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5.2 Recommended Test Setup

Figure 5-2. TPS53515EVM-587 Top Layer for Test Setup

Input Connections:

1. Prior to connecting the DC input-source, VIN, TI recommends to limit the source current from VIN to 10 A

maximum. Ensure that VIN is initially set to 0 V and connected as shown in Figure 5-2.

2. Connect the voltmeter V1 at TP1 (VIN) and TP4 (GND) to measure the input voltage.

Output Connections:

1. Connect the load to J3 and set the load to constant-resistance-mode to sink 0 ADC before VIN is applied.

2. Connect the voltmeter V2 at TP7 (VOUT) and TP9 (GND) to measure the output voltage.

www.ti.com Test Setup

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TPS53515 Step-Down Converter Evaluation Module User's Guide 5

6 Configurations

All Jumper selections must be made prior to applying power to the EVM. Configure this EVM using the following

configuration selections.

6.1 Switching Frequency Selection

Switching frequency can be changed as shown in Table 6-1.

Table 6-1. Switching Frequency Selection

SWITCHING

FREQUENCY(1)

(ƒSW) (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

200 < 0.041 270 11.5

(1) Default Setting: 1 MHz.

For different switching frequency setting, please change R3 and R4 as shown in Table 6-1.

6.2 Mode Selection

The MODE can be set by J5.

Table 6-2. Mode Selection

JUMPER SET TO: MODE SELECTION

1 to 2 pin shorted FCCM with 2x RC time constant

3 to 4 pin shorted(1) FCCM(2) with 1x RC time constant(1)

5 to 6 pin shorted FCCM(2) with 2x RC time constant

7 to 8 pin shorted Auto-skip mode with 2× RC time constant

9 to 10 pin shorted Auto-skip mode with 1× RC time constant

(1) Default setting.

(2) The device enters FCCM after PGOOD goes high.

6.3 VDD Pin Supply Selection

The controller can be enabled and disabled by J7.

Table 6-3. Enable Selection

SET ON CONNECTION ENABLE SELECTION

R19 = 0 Ω(1) VDD pin connected to VIN pins(1)

R19 = Open VDD pin disconnected to VIN pins

(1) Default setting: the VDD pin connected to the VIN pins through R19.

For power-up, input J7 with proper voltage. The VDD pin input voltage range is from 4.5 V to 25 V.

Configurations www.ti.com

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7 Test Procedure

7.1 Line and 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 at 0 ADC.

3. Ensure all jumper setting are configured as shown in Section 6.

4. Ensure the jumper provided in the EVM shorts on J2 before VIN is applied.

5. Increase VIN from 0 to 12 V. Use V1 to measure input voltage.

6. Remove the jumper on J2 to enable the controller.

7. Use V2 to measure the VOUT voltage.

8. Vary the load from 0 to 10 ADC, VOUT must remain in load regulation.

9. Vary VIN from 8 to 14 V, VOUT must remain in line regulation.

10. To disable the converter, place the jumper on J2.

11. Decrease the load to 0 A

12. Decrease VIN to 0 V.

7.2 Control-Loop Gain and Phase-Measurement Procedure

The TPS53515EVM-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 the test points marked TP5 and TP8.

3. Connect the input-signal amplitude-measurement probe (channel A) to TP10. Connect the output-signal

amplitude-measurement probe (channel B) to TP11.

4. Connect the ground lead of channel A and channel B to TP15.

5. Inject around 20 mV or less signal through the isolation transformer.

6. To measure control-loop gain and phase margin, change the frequency from 100 Hz to 1 MHz using a 10-Hz

or less post filter.

7. Disconnect the isolation transformer from the bode-plot test points before making other measurements.

• Signal injection into feedback can interfere with the accuracy of other measurements.

www.ti.com Test Procedure

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TPS53515 Step-Down Converter Evaluation Module User's Guide 7

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 Switch 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

Follow these steps when shutting down the equipment.

1. Shut down load

2. Shut down VIN

Test Procedure www.ti.com

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8 EVM Assembly Drawing and PCB Layout

The following figures show the design of the TPS53515EVM-PWR587 printed circuit board (see Figure 8-1,

Figure 8-2, Figure 8-3, Figure 8-4, Figure 8-5, Figure 8-6, Figure 8-7, and Figure 8-8). The EVM has been

designed using a six-layer, 2-oz copper-circuit board.

Figure 8-1. TPS53515EVM-587 Top-Layer Assembly Drawing

Figure 8-2. TPS53515EVM-587 Bottom-Layer Assembly Drawing

www.ti.com EVM Assembly Drawing and PCB Layout

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TPS53515 Step-Down Converter Evaluation Module User's Guide 9

Figure 8-3. TPS53515EVM-587 Top Layer, Copper

Figure 8-4. TPS53515EVM-587 Layer Two, Copper

EVM Assembly Drawing and PCB Layout www.ti.com

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