Texas Instruments LM63625QDRREVM Manual de usuario

SNVU702–February 2020

LM63625QDRREVM EVM User’s Guide

User's Guide

SNVU702–February 2020

LM63625QDRREVM EVM User’s Guide

The Texas Instruments LM63625QDRREVM evaluation module (EVM) helps designers evaluate the

operation and performance of the LM63625-Q1 buck regulator. The LM63625-Q1 is a family of easy-to-

use synchronous step-down DC/DC converters capable of driving up to 2.5 A of load current from an input

voltage of 3.5 V to 36 V. The LM63625-Q1 features a selectable output voltage of 3.3 V or 5 V and a

switching frequency of 2.1 MHz. See the LM636x5-Q1 3.5-V to 36-V, 1.5-A, and 2.5-A Automotive Step-

down Voltage Converter Data Sheet for additional features, detailed description, and available options.

The EVM options are found in Table 1.

Table 1. Device and Package Configurations

EVM DEVICE OUTPUT

CURRENT SWITCHING

FREQUENCY PACKAGE

LM63625QDRREVM LM63625DQDRRQ1 2.5 A 2.1 MHz DRR0012

(WSON)

Figure 1. LM63625QDRREVM Board Image

Contents

1 Setup .......................................................................................................................... 3

2 Operation ..................................................................................................................... 6

3 Performance Curves ........................................................................................................ 6

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

5 Board Layout ................................................................................................................. 8

6 Bill of Materials ............................................................................................................. 11

List of Figures

1 LM63625QDRREVM Board Image........................................................................................ 1

2 EVM Board Connections.................................................................................................... 3

3 EVM Card Edge Connections.............................................................................................. 4

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4 Jumper Locations............................................................................................................ 4

5 FRA Setup.................................................................................................................... 5

6 Efficiency AUTO Mode, VOUT = 3.3 V, fSW = 2100 KHz.................................................................. 6

7 Efficiency Without Input Filter AUTO Mode, VOUT = 5 V, fSW = 2100 KHz............................................. 6

8 LM63625EVM Schematic................................................................................................... 7

9 Top View of EVM ............................................................................................................ 8

10 Bottom View of EVM ........................................................................................................ 8

11 EVM Top Copper Layer..................................................................................................... 9

12 EVM Mid Layer One......................................................................................................... 9

13 EVM Mid Layer Two ....................................................................................................... 10

14 EVM Bottom Copper Layer ............................................................................................... 10

List of Tables

1 Device and Package Configurations ...................................................................................... 1

2 BOM for LM63625EVM.................................................................................................... 11

Trademarks

All trademarks are the property of their respective owners.

LOAD

INPUT

POWER

SUPPLY

DMM

(+)

(-)

(+)

(-)

(+)

DMM

(+)

(-)

Input

Voltage

Ouput

Voltage

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Setup

SNVU702–February 2020

LM63625QDRREVM EVM User’s Guide

1 Setup

This section describes the test points and connectors on the EVM and how to properly connect, set up,

and use the LM63625QDRREVM. Either the banana jacks on the top of the board or the card edge

connector can be used for connections. See Figure 2 for the top of board connections and Figure 3 for the

card edge connections. See the LM636x5-Q1 3.5-V to 36-V, 1.5-A, and 2.5-A Automotive Step-down

Voltage Converter Data Sheet for details. The following lists the functions of the connections:

VINEMI— Input supply to EVM. Connect to a suitable input supply.

GND— System ground

VOUT— Output of EVM. Connect to desired load.

VOS— Output voltage sense connection (do not use for power; sense only)

VIS— Input voltage sense connection (do not use for power; sense only)

GNDS— Ground sense point for analog measurements (do not use for power; sense only)

Figure 2. EVM Board Connections

VOUT Selection

Jumper Mode Selection

Jumper

Enable

Jumper

GND VOUT

GNDS

VOS

TOP FRONT

BOTTOM FRONT

VIS

VINEMI

INPUT

SUPPLY LOAD

(+) (-) (-) (+)

(+)

(-)

DMM

(-)(+)

(+) (-)

CM Choke

Input *

* = Optional Connections

Input

Voltage

Output

Voltage

Setup

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Figure 3. EVM Card Edge Connections

1.1 Jumpers

See Figure 4 for jumper locations.

VSEL— This jumper allows output voltage selection of either 3.3 V or 5 V. See the Section 2 for details.

MODE— This jumper allows the selection of either AUTO mode or FPWM mode. In addition, by removing

this jumper and supplying a clock signal to the SYNC/MODE test point, the device can by

synchronized to an external clock.

EN— This jumper turns the device on or off. In addition, by removing this jumper and supplying a signal

to the EN test point, the device can be controlled externally.

Figure 4. Jumper Locations

Signal

Injection

^_/v‰µšš}

network analyzer

^_/v‰µšš}

network analyzer

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Setup

SNVU702–February 2020

LM63625QDRREVM EVM User’s Guide

1.2 Test Points

•VINEMI - Input supply to EVM. Connect to a suitable input supply.

•GND - System power ground

•VOUT - Power output of EVM. Connect to desired load.

•VOS - Output voltage sense connection. Connect to DMM.

•VINS - Input voltage sense connection. Connect to DMM.

•GNDS - Ground sense point for analog measurements. Connect to DMM.

•EN - Connected to the EN input of the device

•RESET - Connected to the RESET pin of the IC. It is used as a flag output. The reset function can be

monitored at this test point. Pull-up resistor, RPU, must be populated. A typical value for pullup resistor

is 100 kΩ.

•SYNC/MODE - Connected to the SYNC/MODE pin of the IC.

•VCC - Connected to the VCC output of the device. Can be used for logic level pullups, if needed.

•OPEN PADS - Connections for frequency response analyzer (on bottom of board) to take Bode plots.

See Figure 5 for details of connections.

Figure 5. FRA Setup

Output Current (A)

Efficiency (%)

0.001 0.01 0.1 1 55

100

DRR_

13.5V

18V

24V

Output Current (A)

Efficiency (%)

0.001 0.01 0.1 1 55

100

DRR_

13.5V

18V

24V

Operation

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2 Operation

Once the above connections are made and the appropriate jumpers are set, the EVM is ready to use.

The output voltage of the EVM can be selected by the VSEL jumper to either 3.3 V or 5 V. EN must be

cycled when the jumper is changed, in order for the selection to be programmed. Other values of output

voltage can be set by removing the VSEL jumper and populating Radj (on bottom) with a 10 kΩ. Values

for RFBT and RFBB are then selected and populated in the designated locations. See the LM636x5-Q1 3.5-V

to 36-V, 1.5-A, and 2.5-A Automotive Step-down Voltage Converter Data Sheet for more information.

The switching mode of the EVM can be changed by using the SYNC/MODE jumper; this selection can be

made "on-the-fly".

To use the RESET function, a pullup resistor is required. A place for this resistor is provided on the bottom

of the PCB (RPU). Values of 10 kΩto 100 kΩare appropriate. Be sure to limit the voltage on this pullup to

less than the specified Abs max for this pin.

Some components in the EMI filter are not populated. The user is free to experiment with different EMI

filter components as desired.

Loop gain measurements (Bode plots) can be made using the setup shown in Figure 5.

The EVM has been designed for maximum flexibility regarding component selection. This allows the user

to place preferred components such as the inductor, the capacitors, or both, on the board and test the

performance of the regulator. This way the power supply system can be tested before committing the

design to production.

3 Performance Curves

Figure 6. Efficiency

AUTO Mode, VOUT = 3.3 V, fSW = 2100 KHz Figure 7. Efficiency Without Input Filter

AUTO Mode, VOUT = 5 V, fSW = 2100 KHz

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Schematic

SNVU702–February 2020

LM63625QDRREVM EVM User’s Guide

4 Schematic

Figure 8. LM63625EVM Schematic

CAUTION

Caution Hot surface.

Contact may cause burns.

Do not touch.

Board Layout

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5 Board Layout

Figure 9. Top View of EVM

Figure 10. Bottom View of EVM

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Board Layout

SNVU702–February 2020

LM63625QDRREVM EVM User’s Guide

Figure 11. EVM Top Copper Layer

Figure 12. EVM Mid Layer One

Board Layout

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LM63625QDRREVM EVM User’s Guide

Figure 13. EVM Mid Layer Two

Figure 14. EVM Bottom Copper Layer

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