Texas Instruments TPSM33625EVM Manual de usuario

User’s Guide

TPSM33625, TPSM3365F Evaluation Module

ABSTRACT

The TPSM33625EVM and TPSM33625FEVM enables the evaluation of the TPSM33625 and TPSM33625F

power modules. The EVMs allow for several configurations of the power module. Additionally, electrical test

points provide ease in verifying the performance of the power regulator. Lastly, these EVMs serve as a basis for

the TPSM33625 and TPSM33625F layout and component selection.

CAUTION

Read the user's guide before use.

CAUTION

Hot surface! Contact can cause burns. Do not touch!

Table of Contents

1 Introduction.............................................................................................................................................................................3

2 Setup Procedure..................................................................................................................................................................... 4

3 Test Setup................................................................................................................................................................................5

4 Schematic................................................................................................................................................................................7

5 TPSM33625EVM and TPSM33625FEVM Evaluation............................................................................................................ 9

6 Layout.................................................................................................................................................................................... 13

7 Bill of Materials..................................................................................................................................................................... 17

8 Related Documentation........................................................................................................................................................18

9 Revision History................................................................................................................................................................... 19

List of Figures

Figure 3-1. Test Setup Diagram...................................................................................................................................................6

Figure 4-1. Schematic-Compliance Testing Filter........................................................................................................................ 7

Figure 4-2. Schematic (TPSM33625EVM) – TPSM33625.......................................................................................................... 7

Figure 4-3. Schematic (TPSM33625FEVM) – TPSM33625F...................................................................................................... 7

Figure 4-4. Schematic (TPSM33625EVM) – Configuration Jumpers and Evaluation Test Points...............................................8

Figure 4-5. Schematic (TPSM33625FEVM) – Configuration Jumpers and Evaluation Test Points.............................................8

Figure 5-1. CISPR32 Conducted Scan........................................................................................................................................9

Figure 5-2. CISPR32 Conducted Scan........................................................................................................................................9

Figure 5-3. IR Top Case Measurement......................................................................................................................................10

Figure 5-4. IR Top Case Measurement......................................................................................................................................10

Figure 5-5. IR Top Case Measurement......................................................................................................................................11

Figure 5-6. IR Top Case Measurement......................................................................................................................................11

www.ti.com Table of Contents

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TPSM33625, TPSM3365F Evaluation Module 1

Figure 5-7. IR Top Case Measurement......................................................................................................................................12

Figure 5-8. IR Top Case Measurement......................................................................................................................................12

Figure 6-1. PCB Top 2-D (TPSM33625EVM)............................................................................................................................ 13

Figure 6-2. PCB Top 2-D (TPSM33625FEVM).......................................................................................................................... 13

Figure 6-3. PCB Bottom 2-D......................................................................................................................................................14

Figure 6-4. Top Layer.................................................................................................................................................................14

Figure 6-5. Mid Layer 1..............................................................................................................................................................15

Figure 6-6. Mid Layer 2..............................................................................................................................................................15

Figure 6-7. Bottom Layer........................................................................................................................................................... 16

List of Tables

Table 1-1. EVM Overview............................................................................................................................................................ 3

Table 2-1. Suggested Frequency and Output Voltage Settings................................................................................................... 4

Table 3-1. Description of Jumpers, Test Points, and Terminal Blocks......................................................................................... 5

Table 7-1. Bill of Materials..........................................................................................................................................................17

Trademarks

All trademarks are the property of their respective owners.

Trademarks www.ti.com

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1 Introduction

The output voltage of the TPSM33625EVM and TPSM33625FEVM can be configured from 1.8 V to 12 V with

a load current up to 2.5 A. Measurement points are provided to easily measure conversion efficiency and look

at other performance metrics. In addition, jumpers and test points are provided to evaluate the features of the

TPSM33625 and TPSM33625F, such as programmable enable UVLO, adjustable switching frequency and mode

select (or synchronization), and power-good flag.

The EVM layout allows the TPSM33625 and TPSM33625F and the orderable part numbers to be installed, and

their specific features to be evaluated. The TPSM33625EVM comes installed with the TPSM33625RDNR, the

adjustable switching frequency (RT pin) version of the TPSM33625. The TPSM33625FEVM comes installed with

the TPSM33625FRDNR, the fixed 1-MHz version of the TPSM33625 with mode selection and synchronization

pin.

The TPSM33625EVM is configured by default to be enabled with an output voltage of 5 V, and a switching

frequency of 2.2 MHz with frequency foldback (auto mode) at light load. The TPSM33625FEVM is configured

by default to be enabled with an output voltage of 5 V, and configured for auto mode. The following sections

outline the step-by-step procedure to use the TPSM33625EVM and TPSM33625FEVM and the performance that

is exhibited.

Table 1-1. EVM Overview

EVM Buck Regulator Buck Features

TPSM33625EVM TPSM33625RDNR

Output: 3.3 V/ADJ (1-15 V)

Fsw: ADJ

Mode: Auto

TPSM33625FEVM TPSM33625FRDNR

Output: 5 V/ADJ (1-15 V)

Fsw: 1 MHz

Mode: Auto/FPWM

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2 Setup Procedure

The following procedure outlines the steps to be taken for using the TPSM33625EVM and TPSM625FEVM. Use

this section in conjunction with Section 3 to correctly setup the EVM.

1. Determine the output voltage that is to be evaluated, then reference Section 2. This table provides the

recommended jumper configurations.

2. After making any required changes, confirm that the output voltage is within a couple percent of the set

output voltage.

3. Verify the performance of the EVM and compare with applicable curves within this user's guide.

4. Consult on e2e if there are concerns in the evaluation of this device.

Table 2-1. Suggested Frequency and Output Voltage Settings

VOUT (V) Suggested Frequency

1.8 300 kHz

2.5 800 kHz

3.3 1 MHz

51 MHz (J4: 3 – 4) *2.2 MHz can improve transient response for given

output capacitance.

12 2.2 MHz

Setup Procedure www.ti.com

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3 Test Setup

Table 3-1. Description of Jumpers, Test Points, and Terminal Blocks

Reference Designator Description

J1 Input to series, PI filter for EMC compliance testing. Note polarity, which is annotated in the silkscreen.

Connect to a terminal block with a short, thick gauge (18AWG) wire.

TP1, TP2

VIN test points that bypass the EMC filter and connect directly to input capacitors. Enables more accurate

efficiency measurements as well as potential parasitic minimization and signal integrity of AC measurements.

Connect to test points with a short, thick gauge (18AWG) wire.

TP4 PGOOD test point for verifying PGOOD (output) flag feature.

TP3, TP6

VOUT test points connected directly to output capacitors. Enables more accurate efficiency measurements, as

well, potential parasitic minimization and signal integrity of AC measurements. Connect to test points with a

short, thick gauge (18AWG) wire.

J2 Output (VOUT) terminal block. Connect to terminal block with a short, thick gauge (18AWG) wire.

TP11, TP12 EN test point for accurately measuring EN voltage. If EN voltage is to be applied (externally), resistor R2 and

R4 potentially can need to be removed.

J5 Disable the regulator by shorting the pins of the jumper.

TPSM33625EVM:

Jumper for configuring the switching frequency of the converter. Using the "key" annotated in the schematic

and also in the silkscreen.

Placing the jumper on the adjacent pins sets the annotated switching frequency.

TPSM33625FEVM:

Jumper for configuring the mode or for external signal source synchronization. The EVM is configured for

fixed 1-MHz operation. The mode is set by using the "key" annotated in the schematic and also in the

silkscreen, and by placing the jumper on the pins next to the annotated mode.

Auto mode: Diode emulation (discontinuous inductor current) and frequency foldback in light-load condition.

FPWM mode: Forced continuous conduction (continuous inductor current), constant frequency operation in

light-load condition.

In addition to determining the mode of the device, this pin can be used for synchronization to the

frequency and phase of an external signal source. Reference the data sheet for corresponding signal source

requirements.

TP7, TP8 Test points for applying an external signal source to synchronize the regulator to. The synchronization function

is only to be used with the TPSM33625FEVM (TPSM33625FRDNR).

J3 Jumper for configuring the output voltage. Set the voltage by using the "key" annotated in the schematic and

also in the silkscreen, and by placing the jumper on the pins next to the annotated output voltage.

TP9, TP10 Test points for applying an AC signal source (across an injection resistor) often used in evaluating the loop

response in a current mode regulator, such as the TPSM33625 or TPSM33625F.

www.ti.com Test Setup

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TPSM33625, TPSM3365F Evaluation Module 5

DC Supply

E-Load

DVM

Ammeter Ammeter

Figure 3-1. Test Setup Diagram

Test Setup www.ti.com

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4 Schematic

Customers can choose to implement a PI filter in series with the input of a power regulator, which allows for the

differential noise generated to be attenuated, allowing a noise emission regulation to be met. The filter crossover

frequency is designed for 1-MHz switching frequency, attenuating the switching frequency and the corresponding

harmonics greatly. A damping capacitor is provided (C5), to damp the high-Q PI filter. For more information on

filter damping, see Section 8.

Figure 4-1. Schematic-Compliance Testing Filter

In the buck schematic, the difference between the TPSM33625EVM and TPSM33625FFEVM is the

REFDES=U1 device part number. Use a buck schematic with additional feedback resistors to program

the output voltage and add a placeholder for additional output capacitance to achieve stability or meet a

output transient specification with pin definition RT (adjustable frequency) or Mode/Sync (mode select or

synchronization) differing.

Figure 4-2. Schematic (TPSM33625EVM) – TPSM33625

Figure 4-3. Schematic (TPSM33625FEVM) – TPSM33625F

A disable, frequency select, and output voltage select jumper are provided to aid the evaluation. Additionally, test

points to evaluate product features and stability are provided.

www.ti.com Schematic

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Figure 4-4. Schematic (TPSM33625EVM) – Configuration Jumpers and Evaluation Test Points

A disable, mode select or synchronization, and output voltage select jumper are provided to aid the evaluation.

Additionally, test points to evaluate product features and stability are provided.

Figure 4-5. Schematic (TPSM33625FEVM) – Configuration Jumpers and Evaluation Test Points

Schematic www.ti.com

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5 TPSM33625EVM and TPSM33625FEVM Evaluation

The data was tested on unmodified EVM, configured for 1-MHz operation and 5 VOUT, and was measured at 12

V and a 2-A load.

Figure 5-1. CISPR32 Conducted Scan

The data was tested on unmodified EVM, configured for 1-MHz operation and 5 VOUT, and was measured at 24

VIN and a 2-A load.

Figure 5-2. CISPR32 Conducted Scan

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TPSM33625, TPSM3365F Evaluation Module 9

12 VIN, 2.2 MHz, 2-A load (continuous)

Figure 5-3. IR Top Case Measurement

12 VIN, 1 MHz, 2-A load (continuous)

Figure 5-4. IR Top Case Measurement

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