Texas Instruments TPS65253 Manual de usuario

User’s Guide

TPS65253 Buck Converter Evaluation Module User's

Guide

Table of Contents

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

2 Background.............................................................................................................................................................................3

3 Schematic................................................................................................................................................................................4

4 Placement................................................................................................................................................................................5

5 Bench Test Setup Conditions................................................................................................................................................ 8

5.1 Headers Description and Jumper Placement.....................................................................................................................8

5.2 Jumpers..............................................................................................................................................................................9

5.3 Test Points and Placement.................................................................................................................................................9

6 Power-Up Procedure............................................................................................................................................................ 10

7 Bill of Materials......................................................................................................................................................................11

8 Revision History................................................................................................................................................................... 12

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www.ti.com Table of Contents

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TPS65253 Buck Converter Evaluation Module User's Guide 1

1 Introduction

This document presents the information required to power the TPS65253 PMIC as well as the support

documentation including schematic and bill of materials.

Introduction www.ti.com

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2 Background

The TPS65253 PMIC is designed to provide 3.5-A and 2.5-A continuous outputs with an operational range of 4.5

V to 16 V and an externally set switching frequency ranging from 300 kHz to 1.2 MHz. When the PMIC is not

fully loaded, buck1 can be loaded to 4 A and buck 2 to 3 A.

As there are many possible options to set the converters, Table 2-1 presents the performance specification

summary for the EVM.

Table 2-1. Input Voltage and Output Current Summary

EVM TEST CONDITIONS OUTPUT CURRENT RANGE

TPS65253EVM VIN = 4.5 V to 16 V

fsw = 500 kHz

Buck1, 1.2 V, 3.5 A

Buck2, 3.3 V, 2.5 A

(25°C ambient)

This evaluation module is designed to provide access to the features of the TPS65253. Some modifications

can be made to this module to test performance at different input and output voltages, current and frequency

operation. Please contact TI Field Applications Group for advice on these matters.

www.ti.com Background

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TPS65253 Buck Converter Evaluation Module User's Guide 3

3 Schematic

Figure 3-1 illustrates the TPS65253 EVM schematic.

The resistor and capacitor values have been chosen according to the guidelines presented on the TPS65253 spec available at http://focus.ti.com/docs/

prod/folders/print/TPS65253.html.

Note that for the purpose of gains-phase measurements R9 and R11 (0 Ω on the EVM) need to be replaced by suitable low value resistors as per the

network analyzer setup required. Test points are provided on either end of the resistors to allow for easy measurement. Also, R3, R4, C10, and C12 can

be populated if users desire to reduce overshoot at LX pins due to parasitic L and C resonance.

ROSC

FB1

COMP1

SS1

RLIM1

EN1

BST1

VIN1 8

LX1 9

LX1 10

LX2 11

LX2 12

VIN2 13

BST2 14

EN2 15

RLIM2 16

SS2 17

COMP2 18

FB2 19

LOW_P/SDA 20

V7V 21

V3p3

PGOOD

MR/SCL

INT

TPS65253

3.3uF

C22

TP24

V3p3

100K

R24

R25

TP25

TP26

TP28

383K

V7V

V3p3

100K

R28

FB1

100pF

DNI

C3a

20K

4.7nF

100K

JP6

4.7nF

47nF

TP8

10uF

25V

VIN

22uF

40.2K R9a

80.6K

R9b

4.7nF

C9a

FB1

4.7uH

L11

J11

22uF

C11

40.2K

R11a

32K

R11b

4.7nF

C11a

FB2

47nF

C14

10uF

25V

C13

VIN

JP15 4.7nF

C15

TP20

150KR16

4.7nF

C17

100pF

DNI C18a

20K

R18

4.7nF

C18

FB2

10uF

C21

SDA

TP9

TP9a

TP9b

R11

TP11 TP11b

TP11a

1.8V@2A

1.2V@3A

TP1 TP2 TP3 TP4 TP5

JP20

V3p3

TP23

4.5V

V3p3

S25 JP25 0.1uF

DNI

C25

S26

0.1uF

DNI

C26

JP23

V7V

R26 JP26

VOUT2

VOUT1

VIN

Figure 3-1. TPS65253 Schematic

Schematic www.ti.com

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4 Placement

Figure 4-1. Part Placement

Figure 4-2. Top Layer

www.ti.com Placement

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TPS65253 Buck Converter Evaluation Module User's Guide 5

Figure 4-3. Mid-Layer 1

Figure 4-4. Mid-Layer 2

Placement www.ti.com

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Figure 4-5. Bottom Layer

www.ti.com Placement

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TPS65253 Buck Converter Evaluation Module User's Guide 7

5 Bench Test Setup Conditions

5.1 Headers Description and Jumper Placement

Vin:4.5V – 16V

Vout1

Vout2

PGOOD

LOW_P EN2

EN1

Figure 5-1. Headers Description and Jumper Placement

Test points:

Black – GND

White – Each output, feed-back, power good and VIN. All marking on PCB.

Bench Test Setup Conditions www.ti.com

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5.2 Jumpers

Table 5-1. Jumpers

JUMPER

NO. FUNCTION PLACEMENT COMMENT

JP6 BUCK1 enable (EN1) For sequencing do not fit jumper.

To disable converter fit jumper to GND. Fit according to test requirement

JP15 BUCK2 enable (EN2) For sequencing do not fit jumper.

To disable converter fit jumper to GND. Fit according to test requirement

JP20 LOW_P Low power: Power save mode ON/OFF.

If need low power mode test, should connect V3V.

Fit according to test requirement.

During normal operation jumper must be

fitted.

JP24 PGOOD Pulls PGOOD signal to internal 3V3 rail or

grounds pin Fit according to test requirement

5.3 Test Points and Placement

Buck converter outputs are white and have a label for easy location. Close to any of these test points there

are black ground test points to allow for DVM measurement or to use a metal exposed scope probe to reduce

common mode noise measurements. All test points are described in Table 5-2.

Table 5-2. Test Points and Placement

TEST

POINT NAME SIGNAL COLOR COMMENT

TP1, TPS, TP3,

TP4, TP5 GND Ground Black

TP8 VIN Input supply White

TP9, TP9A VOUT1 Buck1 output White

TP9B Input for gain-phase measurement Buck1 White Normally not used

TP11, TP11A VOUT2 Buck2 output White

TP11B Input for gain-phase measurement Buck2 White Normally not used

TP20 Low_P Low Power input White

TP24 PGOOD Power Good

(open drain connected to Buck1 output) White

www.ti.com Bench Test Setup Conditions

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TPS65253 Buck Converter Evaluation Module User's Guide 9

6 Power-Up Procedure

1. Define which converters are to be enabled or disabled by connecting the correct jumpers accordingly.

2. Apply a DC voltage to jumper J8. Polarity is clearly marked on the silk-screen.

3. Verify that the relevant converters are powered up by the output voltages. The whole start-up process will

take less than 100 ms. PGOOD will be asserted high 32 ms after all converter outputs have reached 90% of

nominal voltages.

4. Apply loads to the output connectors (J9 and J11).

Power-Up Procedure www.ti.com

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