Texas Instruments LM63625EVM Manual de usuario

SNVU599A–February 2019–Revised October 2019

LM63625EVM EVM User’s Guide

Advance Information

User's Guide

SNVU599A–February 2019–Revised October 2019

LM63625EVM EVM User’s Guide

The Texas Instruments LM63625EVM 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 LM63625EVM 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 FREQUENCY/OUTPUT

CURRENT

LM63625EVM LM63625DQPWPRQ1 2100 kHz / 2.5 A

Contents

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

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

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

4 Schematic..................................................................................................................... 9

5 Board Layout................................................................................................................ 10

6 Bill of Materials ............................................................................................................. 13

List of Figures

1 EVM Board Connections.................................................................................................... 3

2 EVM Card Edge Connections.............................................................................................. 4

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

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

5 Efficiency Without Input Filter AUTO Mode, VOUT = 3.3V, fSW = 2.1 MHz............................................. 6

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6 Efficiency Without Input Filter AUTO Mode, VOUT = 5 V, fSW = 2.1 MHz .............................................. 6

7 Load Transient 12 VIN, 3.3 VOUT, 0 A to 1 A, COUT = 2 × 22 µF , IOUT Slew Rate = 1 A/µs........................... 6

8 Load Transient 12 VIN, 3.3 VOUT, 0.1 A to 1 A, COUT = 2 × 22 µF, IOUT Slew Rate = 1 A/µs......................... 6

9 Load Transient 12 VIN, 3.3 VOUT, 0 A to 2.5 A, COUT = 2 × 22 µF, IOUT Slew Rate = 1 A/µs......................... 6

10 Load Transient 2 VIN, 3.3 VOUT, 0.1 A to 2.5 A, COUT = 2 × 22 µF, IOUT Slew Rate = 1 A/µs ........................ 6

11 Load Transient 12 VIN, 5 VOUT, 0 A to 1 A, COUT = 2 × 22 µF, IOUT Slew Rate = 1 A/µs.............................. 7

12 Load Transient 2 VIN, 5 VOUT, 0.1 A to 1 A, COUT = 2 × 22 µF, IOUT Slew Rate = 1 A/µs............................. 7

13 Load Transient 12 VIN, 5 VOUT, 0 A to 2.5 A, COUT = 2 × 22 µF, IOUT Slew Rate = 1 A/µs ........................... 7

14 Load Transient 2 VIN, 5 VOUT, 0.1 A to 2.5 A, COUT = 2 × 22 µF, IOUT Slew Rate = 1 A/µs........................... 7

15 Output Voltage Ripple Auto Mode 2 VIN, 3.3 VOUT, 0 A.................................................................. 7

16 Output Voltage Ripple Auto Mode 2 VIN, 5 VOUT, 0 A.................................................................... 7

17 IC Temperature = 48.2°C 2 VIN, 3.3 VOUT, IOUT = 2.5 A, fSW = 2.1 MHz ................................................ 8

18 IC Temperature = 49.1°C 2 VIN, 5 VOUT, IOUT = 2.5 A, fSW = 2.1 MHz .................................................. 8

19 LM63625EVM Schematic................................................................................................... 9

20 Top View of EVM........................................................................................................... 10

21 EVM Top Copper Layer ................................................................................................... 11

22 EVM Mid Layer One ....................................................................................................... 11

23 EVM Mid Layer Two ....................................................................................................... 12

24 EVM Bottom Copper Layer ............................................................................................... 12

List of Tables

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

2 BOM for LM63625EVM.................................................................................................... 13

Trademarks

All trademarks are the property of their respective owners.

Load

(+)

(-)

Input

Supply

(-)

(+)

DMM

(-) (+)

DMM

(-) (+)

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Setup

SNVU599A–February 2019–Revised October 2019

LM63625EVM EVM User’s Guide

Advance Information

1 Setup

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

and use the LM63625EVM . Either the test points on the top of the board or the card edge connector can

be used for connections. See Figure 1 for the top of board connections and Figure 2 for the card edge

connections. The following lists the functions of the connections:

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

requirements.

GND— System ground

VOUT— Output of EVM. Connect to desired load.

VOUTS— Output voltage sense connection (do not use for current; sense only)

VINS— Input voltage sense connection (do not use for current; sense only)

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

Figure 1. EVM Board Connections

5V or 3.3V

Output Voltage

Selection Jumper

FPWM or Auto

Selection Jumper

GND VOUT

GNDS

VOS

TOP FRONT

BOTTOM FRONT

VIS

VIN

Load

(+)(-)

Input

Supply (-)(+)

DMM (-)(+) DMM

(-) (+)

Setup

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Figure 2. EVM Card Edge Connections

1.1 Jumpers

See Figure 3 for jumper locations.

•J1 This jumper allows the VOUT_SEL pin input to be connected to either VCC or GND for a fixed

output voltage selection of 3.3 V or 5 V, respectively. Alternatively, the jumper can be left open and a

RVOUTSEL can be populated with 10 kΩto have the part operate with an adjustable output voltage. 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 feedback resistor calculation.

•J2 This jumper allows SYNC to be connected in this mode to either VCC or GND. When connected to

VCC, the part operates in forced pulse width modulation (FPWM) mode and when the SYNC pin is

connected to GND, the part operates in auto mode where pulse frequency modulation (PFM) is

engaged.

Figure 3. Jumper Locations

OSC

Signal

Injection

^_/v‰µšš}

network analyzer

^_/v‰µšš}

network analyzer

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Setup

SNVU599A–February 2019–Revised October 2019

LM63625EVM EVM User’s Guide

Advance Information

1.2 Test Points

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

requirements.

•GND - System power ground

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

•VOUTS - Output voltage sense connection. Connect to DMM. It is also used for frequency response

analyzer connection (do not use for current; sense only).

•VINS - Input voltage sense connection. Connect to DMM (do not use for current; sense only).

•GNDS - Ground sense point for analog measurements. Connect to DMM (do not use for current; sense

only).

•EN - Connection for external EN logic input. Connect controlling logic to EN test point for external

enable control.

•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. Pullup resistor, RPULLUP, must be populated. A typical value for pullup

resistor is 100 kΩ.

•SYNC - Connected to the SYNC pin of the IC. Connection to an external clock or synchronization

signal enables the IC switching frequency to follow the synchronization signal.

•TPGND1, TPGND2 - System power ground

•OPEN PADS - Connection for frequency response analyzer (on bottom of board). See Figure 4.

Figure 4. FRA Setup

VOUT (100 mV/div)

VIN (10 V/div)

IOUT (1 A/div)

Time = 200 µs/div

VOUT (50 mV/div)

VIN (10 V/div)

IOUT (1 A/div)

Time = 200 µs/div

Output Current (A)

Efficiency (%)

0.1 0.2 0.3 0.4 0.5 0.7 1 2 3

100

LM63

VIN = 12V

VIN = 24V

Output Current (A)

Efficiency (%)

0.1 0.2 0.3 0.4 0.5 0.7 1 2 3

100

LM63

VIN = 12V

VIN = 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

EN pin is pulled up to VIN with a 100-kΩresistor.

The output voltage of the EVM can be selected by the VOUT jumper to either 3.3 V or 5 V. Other values

of output voltage can be programmed by removing the jumper on J1 before powering on the device and

changing the value of RFBT and RFBB on the EVM. In addition, it is possible that the values of the inductor

and the output capacitance need to be changed. 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 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 5. Efficiency Without Input Filter

AUTO Mode, VOUT = 3.3V, fSW = 2.1 MHz Figure 6. Efficiency Without Input Filter

AUTO Mode, VOUT = 5 V, fSW = 2.1 MHz

Figure 7. Load Transient 12 VIN, 3.3 VOUT, 0 A to 1 A,

COUT = 2 × 22 µF , IOUT Slew Rate = 1 A/µs Figure 8. Load Transient 12 VIN, 3.3 VOUT, 0.1 A to 1 A,

COUT = 2 × 22 µF, IOUT Slew Rate = 1 A/µs

VOUT (500 mV/div)

VIN (10 V/div)

IOUT (1 A/div)

Time = 200 µs/div

VOUT (200 mV/div)

VIN (10 V/div)

IOUT (1 A/div)

Time = 200 µs/div

VOUT (200 mV/div)

VIN (10 V/div)

IOUT (1 A/div)

Time = 200 µs/div

VOUT (100 mV/div)

VIN (10 V/div)

IOUT (1 A/div)

Time = 200 µs/div

VOUT (200 mV/div)

VIN (10 V/div)

IOUT (1 A/div)

Time = 200 µs/div

VOUT (200 mV/div)

VIN (10 V/div)

IOUT (1 A/div)

Time = 200 µs/div

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Performance Curves

SNVU599A–February 2019–Revised October 2019

LM63625EVM EVM User’s Guide

Advance Information

Figure 9. Load Transient 12 VIN, 3.3 VOUT, 0 A to 2.5 A,

COUT = 2 × 22 µF, IOUT Slew Rate = 1 A/µs Figure 10. Load Transient 2 VIN, 3.3 VOUT, 0.1 A to 2.5 A,

COUT = 2 × 22 µF, IOUT Slew Rate = 1 A/µs

Figure 11. Load Transient 12 VIN, 5 VOUT, 0 A to 1 A,

COUT = 2 × 22 µF, IOUT Slew Rate = 1 A/µs Figure 12. Load Transient 2 VIN, 5 VOUT, 0.1 A to 1 A,

COUT = 2 × 22 µF, IOUT Slew Rate = 1 A/µs

Figure 13. Load Transient 12 VIN, 5 VOUT, 0 A to 2.5 A,

COUT = 2 × 22 µF, IOUT Slew Rate = 1 A/µs Figure 14. Load Transient 2 VIN, 5 VOUT, 0.1 A to 2.5 A,

COUT = 2 × 22 µF, IOUT Slew Rate = 1 A/µs

VOUT_AC_Coupled

(10 mV/div)

SW (10 V/div)

IOUT (1 A/div)

Time = 20 ms/div

VOUT_AC_Coupled

(10 mV/div)

SW (10 V/div)

IOUT (1 A/div)

Time = 20 ms/div

Performance Curves

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Figure 15. Output Voltage Ripple

Auto Mode 2 VIN, 3.3 VOUT, 0 A Figure 16. Output Voltage Ripple

Auto Mode 2 VIN, 5 VOUT, 0 A

Figure 17. IC Temperature = 48.2°C

2 VIN, 3.3 VOUT, IOUT = 2.5 A, fSW = 2.1 MHz Figure 18. IC Temperature = 49.1°C

2 VIN, 5 VOUT, IOUT = 2.5 A, fSW = 2.1 MHz

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Schematic

SNVU599A–February 2019–Revised October 2019

LM63625EVM EVM User’s Guide

Advance Information

4 Schematic

Figure 19. LM63625EVM Schematic

CAUTION

Caution Hot surface.

Contact may cause burns.

Do not touch.

Board Layout

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5 Board Layout

Figure 20. Top View of EVM

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