Texas Instruments TPS51113 Manual de usuario

User’s Guide

TPS51113 Buck Controller Evaluation Module User's

Guide

Table of Contents

1 Introduction.............................................................................................................................................................................2

2 Description.............................................................................................................................................................................. 2

3 Typical Applications............................................................................................................................................................... 2

4 Features...................................................................................................................................................................................2

5 Electrical Performance Specifications................................................................................................................................. 2

6 Schematic................................................................................................................................................................................3

7 Test Setup................................................................................................................................................................................4

8 Test Procedure........................................................................................................................................................................ 6

9 Performance Data and Typical Characteristic Curves........................................................................................................ 7

10 EVM Assembly Drawing and PCB Layout........................................................................................................................ 10

11 List of Materials...................................................................................................................................................................11

12 References...........................................................................................................................................................................11

13 Revision History..................................................................................................................................................................11

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TPS51113 Buck Controller Evaluation Module User's Guide 1

1 Introduction

The TPS51113-EVM evaluation module (EVM), is a high efficiency single phase synchronous buck converter

providing a fixed 1.2-V output at up to 25 A from a 12-V input bus. The EVM uses the TPS51113 synchronous

buck controller.

2 Description

The TPS51113-EVM is designed to use a regulated 12-V (8 V to 14 V) bus to produce a high current, regulated

1.2-V output at up to 25 A of the load current. The TPS51113-EVM is designed to demonstrate the TPS51113

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

TPS51113.

3 Typical Applications

• High current system converters for server and desktop power

• Point of load non-isolated DC-DC converters for telecom and datacom application

4 Features

The TPS51113-EVM features include:

• 25-A DC steady state current

• Start-up into the pre-biased output

• 300-kHz switching frequency

• JP1 for enable function

• Convenient test points for probing critical waveforms and loop response testing

• Four-layer PCB with 2-oz. copper

• All components on the top layer

5 Electrical Performance Specifications

Table 5-1 gives the EVM performance specifications.

Table 5-1. Performance Specification Summary

SPECIFICATION TEST CONDITIONS MIN TYP MAX UNITS

INPUT CHARACTERISTICS

VIN Input voltage range 8 12 14 V

IIN(max) Maximum input current VIN = 8 V, IO = 25 A 4.3 A

IIN No load input current VIN = 14 V, IO = 0 A 100 mA

OUTPUT CHARACTERISTICS

VOUT Output voltage 1.2 V

VREG Output voltage regulation Line regulation 0.1%

Load regulation 0.3%

VRIPPLE Output voltage ripple VIN = 12 V, IO = 25 A 40 mVpp

Ouptut load current 0 25 A

Output overcurrent threshold 33 A

SYSTEMS CHARACTERISTICS

fSW Switching frequency 300 kHz

η Peak efficiency VIN = 12 V, VOUT = 1.2 V, IO = 18 A 89.19%

η Full load efficiency VIN = 12 V, VOUT = 1.2 V, IO = 25 A 88.57%

TAOperating ambient temperature 25 °C

Introduction www.ti.com

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6 Schematic

COMP

CHB

CHA

GND PGN

PGND

VIN

ENABL

GND

LOOP INJECTION PGOOD

PGND

VOUT

PGND

Enable Notes:

1. No jumper on the JP1 to Enable the controller.

2. Jumper shorted on JP1 to disable the controller

Figure 6-1. TPS51113-EVM Schematic Diagram

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TPS51113 Buck Controller Evaluation Module User's Guide 3

7 Test Setup

7.1 Test Equipment

7.1.1 Voltage Source

The input voltage source VIN should be a variable DC source between 0 V and 14 V, capable of supplying 10

ADC. Connect VIN to J1 as shown in Figure 7-2.

7.1.2 Multimeters

A voltmeter between 0 V and 15 V should be used to measure VIN at TP1 (VIN) and TP2 (GND). A voltmeter

between 0 V and 5 V for output voltage measurement at TP6 (VOUT) and TP8 (GND). A current meter between 0

A and 10 A (A1) as shown in Figure 7-2 is used for input current measurements.

7.1.3 Output Load

The output load should be an electronic constant resistance mode load capable of between 0 ADC and 30 ADC at

1.2 V.

7.1.4 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

• 2-μs/division horizontal resolution

• 50-mV/division vertical resolution

Test points TP6 and TP8 can be used to measure the output ripple voltage. Place the oscilloscope probe tip

through TP6 and rest the ground barrel on TP8 as shown in Figure 7-1. Using a leaded ground connection may

induce additional noise due to the large ground loop.

TP8TP6

Metal Ground Barrel

Probe Tip

Figure 7-1. Tip and Barrel Measurement for VOUT Ripple

7.1.5 Fan

Some of the components in this EVM may approach temperatures of 60°C during operating. A small fan capable

of 200–400 LFM is recommended to reduce component temperatures while the EVM is operating. The EVM

should not be probed while the fan is not running.

7.1.6 Recommended Wire Gauge

For VIN to J1 (12-V input), the recommended wire size is 1 × AWG #14 per input connection, with the total length

of wire less than four feet (2-feet input, 2-feet return). For J2 to LOAD, the minimum recommended wire size is 2

× AWG #14, with the total length of wire less than four feet (2-feet output, 2-feet return).

Test Setup www.ti.com

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7.2 Recommended Test Setup

Figure 7-2 is the recommended test set up to evaluate the TPS51113-EVM. Working at an ESD workstation,

make sure that any wrist straps, bootstraps, or mats are connected referencing the user to earth ground before

power is applied to the EVM.

EXAST

INSTRUMENTS

FAN

source

Load

Figure 7-2. TPS51113-EVM Recommended Test Setup

7.2.1 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 7-2.

2. Connect a voltmeter V1 at TP1(VIN) and TP2 (GND) to measure the input voltage.

7.2.2 Output Connections

1. Connect Load to J2 and set Load to constant resistance mode to sink 0 ADC before VIN is applied.

2. Connect a voltmeter V2 at TP6 (VOUT) and TP8 (GND) to measure the output voltage.

7.2.3 Other Connections

Place a fan as shown in Figure 7-2 and turn it on, making sure air is flowing across the EVM.

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TPS51113 Buck Controller Evaluation Module User's Guide 5

8 Test Procedure

8.1 Line/Load Regulation and Efficiency Measurement Procedure

1. Ensure that the load is set to constant resistance mode and to sink 0 ADC.

2. Ensure that the jumper provided in the EVM shorts on JP1 before VIN is applied.

3. Increase VIN from 0 V to 12 V, using V1 to measure input voltage.

4. Remove the jumper on JP1 to enable the controller.

5. Vary load from between 0 ADC and 25 ADC. VOUT should be remain in load regulation.

6. Vary VIN from 8 V to 14 V. VOUT should remain in line regulation.

7. Put the jumper on JP1 to disable the controller.

8. Decrease the load to 0 A.

9. Decrease VIN to 0 V.

8.2 Control Loop Gain and Phase Measurement Procedure

The TPS51113-EVM contains a 20-Ω series resistor in the feedback loop for loop response analysis.

1. Set up the EVM as described in Section 8.1 and Figure 7-2.

2. Connect the isolation transformer to test points marked TP4 and TP3.

3. Connect an input signal amplitude measurement probe (channel A) to TP4.

4. Connect an output signal amplitude measurement probe (channel B) to TP3. Connect the ground lead of

channel A and channel B to TP9 and TP10.

5. Inject around 40-mV or less signal through the isolation transformer.

6. Sweep the frequency from 100 Hz to 1 MHz with a 10-Hz or lower post filter. The control loop gain and

phase margin can be measured.

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

(Signal injection into feedback may interfere with accuracy of other measurements).

8.3 Test Points

Table 8-1. Test Point Functions

TEST POINTS NAME DESCRIPTION

TP1 VIN+ 12-V input

TP2 GND PGND for VIN

TP3 CHB Input B for loop injection

TP4 CHA Input A for loop injection

TP5 SW Monitor switch node voltage

TP6 VOUT VOUT

TP7 COMP Enable/COMP

TP8 GND PGND for VOUT

TP9 GND GND for loop measurement

TP10 PGND PGND

TP11 PGOOD Power Good

8.4 Equipment Shutown Procedure

1. Shut down the load.

2. Shut down VIN.

3. Shut down the fan.

Test Procedure www.ti.com

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9 Performance Data and Typical Characteristic Curves

Figure 9-1 through Figure 9-8 present typical performance curves for the TPS51113-EVM.

24 6 8 10 12 14 16 18 20 22 24

IOUT – Output Current – A

h– Efficiency – %

Input

Voltage (V)

EFFICIENCY

OUTPUT CURRENT

Figure 9-1. Efficiency

1.192

1.190

2 4 6 8 10 12 14 16 18 20 22 24 26

1.196

1.194

1.200

1.198

IOUT – Output Current – A

VOUT – Output Voltage – V

OUTPUT VOLTAGE

OUTPUT CURRENT

Input

Voltage (V)

Figure 9-2. Load Regulation

Figure 9-3. Bode Plot

Figure 9-3 shows the bode plot where:

• VIN = 12 V

• VOUT = 1.2 V

• IOUT = 25 A

• Crossover frequency = 39.72 kHz

• Phase margin = 70.53°

• Gain margin = 23.13 dB

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TPS51113 Buck Controller Evaluation Module User's Guide 7

Figure 9-4. 0-A to 10-A Load TransientX X Figure 9-5. Output RippleX X

Figure 9-6. Enable Turn-OffX X Figure 9-7. Enable Turn-OnX X

Figure 9-8. Switching Node

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TPS51113 Buck Controller Evaluation Module User's Guide 9

10 EVM Assembly Drawing and PCB Layout

Figure 10-1 through Figure 10-6 show the design of the TPS51113-EVM printed circuit board. The EVM has

been designed using four layers on a 2-oz. copper circuit board.

EXAST

INSTRUMENTS

Figure 10-1. Top Layer Assembly Drawing (Top

View)

Figure 10-2. Bottom Assembly Drawing (Bottom

View)

Figure 10-3. Top Copper (Top View) Figure 10-4. Internal Layer 1 (Top View)

Figure 10-5. Internal Layer 2 (Top View) Figure 10-6. Bottom Copper (Top View)

EVM Assembly Drawing and PCB Layout www.ti.com

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