Texas Instruments LM63635EVM User manual

SNVU617–January 2020

LM63635EVM EVM User’s Guide

User's Guide

SNVU617–January 2020

LM63635EVM EVM User’s Guide

The Texas Instruments LM63635EVM evaluation module (EVM) helps designers evaluate the operation

and performance of the LM63635-Q1 buck regulator. The LM63635-Q1 is a family of easy-to-use

synchronous step-down DC/DC converters capable of driving up to 3.25 A of load current from an input

voltage of 3.5 V to 32 V. The LM63635EVM features a selectable output voltage of 3.3 V or 5 V and a

switching frequency of 400 kHz. 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

LM63635EVM LM63635DQPWPRQ1 400 kHz / 3.25 A

Contents

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

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

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

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

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

6 Bill of Materials ............................................................................................................. 12

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 = 400 KHz............................................. 6

6 Efficiency Without Input Filter AUTO Mode, VOUT = 5 V, fSW = 400 KHz.............................................. 6

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7 LM63635EVM Schematic................................................................................................... 7

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

9 Bottom View of EVM ........................................................................................................ 9

10 EVM Top Copper Layer..................................................................................................... 9

11 EVM Mid Layer One ....................................................................................................... 10

12 EVM Mid Layer Two ....................................................................................................... 10

13 EVM Bottom Copper Layer ............................................................................................... 11

List of Tables

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

2 BOM for LM63635EVM.................................................................................................... 12

Trademarks

All trademarks are the property of their respective owners.

LOAD

POWER

SUPPLY

DMM

(+)

(-)

(+)

(-)

(+)

DMM

(+)

(-)

VIN

VOUT

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Setup

SNVU617–January 2020

LM63635EVM 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 LM63635EVM. 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

VINEMI

INPUT

SUPPLY LOAD

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

(+)

(-)

DMMDMM

(-)(+)

(+)(-)

Filtered

VOUT *

(+) (-)

CM Choke

Input *

* = Optional Connections

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

Signal

Injection

^_/v‰µšš}

network analyzer

^_/v‰µšš}

network analyzer

GND

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Setup

SNVU617–January 2020

LM63635EVM EVM User’s Guide

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

Figure 4. FRA Setup

Output Current (A)

Efficiency (%)

0.001 0.01 0.1 1 55

eff_

13.5V

18V

24V

Output Current (A)

Efficiency (%)

0.001 0.01 0.1 1 55

100

eff_

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

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.

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

of the PCB. 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.

The EVM is equipped with several EMI filter options. These are accessed through the edge connector as

shown in Figure 2. Refer to Figure 2,Figure 7, and Table 2 for details.

Loop gain measurements can be made using the setup shown in Figure 4.

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 = 400 KHz

Figure 6. Efficiency Without Input Filter

AUTO Mode, VOUT = 5 V, fSW = 400 KHz

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Schematic

SNVU617–January 2020

LM63635EVM EVM User’s Guide

4 Schematic

Figure 7. LM63635EVM Schematic

CAUTION

Caution Hot surface.

Contact may cause burns.

Do not touch.

Board Layout

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LM63635EVM EVM User’s Guide

5 Board Layout

Figure 8. Top View of EVM

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Board Layout

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LM63635EVM EVM User’s Guide

Figure 9. Bottom View of EVM

Figure 10. EVM Top Copper Layer

Board Layout

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LM63635EVM EVM User’s Guide

Figure 11. EVM Mid Layer One

Figure 12. EVM Mid Layer Two

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