Texas Instruments LM63635DNEVM User manual

User’s Guide

LM63635DNEVM EVM User’s Guide

ABSTRACT

The Texas Instruments LM63635DNEVM evaluation module (EVM) helps designers evaluate the operation and

performance of the LM636x5CAQDRRQ1 buck regulator. The LM636x5CAQDRRQ1 is a family of easy-to-use

synchronous step-down DC/DC converters capable of driving up to 3.5 A of load current from an input voltage

of 3.5 V to 36 V. 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. Please note that this EVM

is designed for the LM636x5CAQDRRQ1. This device has a different pin-out than the other devices in the

LM636x5-Q1 product family.

Table 1-1. Device and Package Configurations

EVM DEVICE OUTPUT

VOLTAGE

OUTPUT

CURRENT

SWITCHING

FREQUENCY PACKAGE

LM63635DNEVM LM63635CAQDRRQ1 5 V 3.25 A 2.1 MHz DRR0012

(WSON)

Figure 1-1. LM63635DNEVM Board Image

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LM63635DNEVM EVM User’s Guide 1

Table of Contents

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

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

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

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

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

6 Bill of Materials..................................................................................................................................................................... 10

List of Figures

Figure 1-1. LM63635DNEVM Board Image.................................................................................................................................1

Figure 1-1. EVM Board Connections........................................................................................................................................... 3

Figure 1-2. EVM Card Edge Connections................................................................................................................................... 4

Figure 1-3. Jumper Locations...................................................................................................................................................... 4

Figure 1-4. FRA Setup.................................................................................................................................................................5

Figure 3-1. Efficiency: AUTO Mode, VOUT = 5 V, fSW = 2100 kHz............................................................................................... 6

Figure 3-2. Line and Load Regulation: AUTO Mode, VOUT = 5 V, fSW = 2100 kHz......................................................................6

Figure 4-1. LM63635DNEVM Schematic.....................................................................................................................................7

Figure 5-1. Top View of EVM....................................................................................................................................................... 8

Figure 5-2. Bottom View of EVM..................................................................................................................................................8

Figure 5-3. EVM Top Copper Layer............................................................................................................................................. 9

Figure 5-4. EVM Mid Layer One.................................................................................................................................................. 9

Figure 5-5. EVM Mid Layer Two.................................................................................................................................................. 9

Figure 5-6. EVM Bottom Copper Layer....................................................................................................................................... 9

List of Tables

Table 1-1. Device and Package Configurations...........................................................................................................................1

Table 6-1. BOM for LM63625DNEVM........................................................................................................................................10

Trademarks

All trademarks are the property of their respective owners.

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1 Setup

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

the LM63635DNEVM. Either the banana jacks on the top of the board or the card edge connector can be used

for connections. See Figure 1-1 for the top of board connections and Figure 1-2 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).

LOAD

Input Power

Supply

Output

Voltage

DMM

Input Voltage

DMM

(+)

(-)

(+)

(-)

(+)

(-)

(+)

(-)

Figure 1-1. EVM Board Connections

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LM63635DNEVM EVM User’s Guide 3

GND VOUT

GNDS

VOS

TOP FRONT

BOTTOM FRONT

VIS

VINEMI

INPUT

SUPPLY LOAD

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

(+)

(-)

DMM

(-)(+)

(+) (-)

CM Choke

Input *

* = Optional Connections

Input

Voltage

Output

Voltage

Figure 1-2. EVM Card Edge Connections

1.1 Jumpers

See Figure 1-3 for jumper locations.

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.

Mode Selec on

Jumper

EN Control

Jumper

Figure 1-3. Jumper Locations

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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.

•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 1-4 for details of connections.

Signal

Injection

^_/v‰µšš}

network analyzer

^_/v‰µšš}

network analyzer

Figure 1-4. FRA Setup

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LM63635DNEVM EVM User’s Guide 5

2 Operation

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

The EVM is configured for a 5-V output. The output voltage can be changed by changing the values of

resistors R2 (RFBT) and or R3 (RFBB). Depending on the output capacitors and the desired loop performance, a

feed-forward capacitor, C5 (CFF) can be desirable. A space is available on the EVM for this optional component.

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 MODE jumper; this selection can be made

on-the-fly.

The RESET flag is used to indicate when the output voltage is within +/- 5 % of the regulated value. This EVM is

configured with a 100 kΩ pull-up resistor from RESET to VCC (about 5V). A low on RESET indicates the output

voltage is out of regulation. The pull-up resistor can be removed and the open-drain RESET pin can be used to

control a system processor from the EVM. Be sure to limit the voltage on the RESET 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 1-4.

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

Curves showing typical performance data are found in Figure 3-1and Figure 3-2. For other conditions and/or

other data, consult the device data sheet.

Output Current (A)

Efficiency (%)

0 0.5 1 1.5 2 2.5 3

13.5V

18V

24V

Figure 3-1. Efficiency: AUTO Mode, VOUT = 5 V, fSW

= 2100 kHz

Output Current (A)

Output Voltage (V)

0 0.5 1 1.5 2 2.5 3

5.01

5.02

5.03

5.04

5.05

13.5V

18V

24V

Figure 3-2. Line and Load Regulation: AUTO Mode,

VOUT = 5 V, fSW = 2100 kHz

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4 Schematic

Figure 4-1. LM63635DNEVM Schematic

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5 Board Layout

CAUTION

Caution Hot surface.

Contact may cause burns.

Do not touch.

Figure 5-1. Top View of EVM

Figure 5-2. Bottom View of EVM

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Figure 5-3. EVM Top Copper Layer Figure 5-4. EVM Mid Layer One

Figure 5-5. EVM Mid Layer Two Figure 5-6. EVM Bottom Copper Layer

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LM63635DNEVM EVM User’s Guide 9

6 Bill of Materials

Table 6-1. BOM for LM63625DNEVM

DESIGNATOR COMMENT DESCRIPTION MANUFACTURER PART NUMBER QUANTITY

C1 CB CAP, CERM, 0.22 µF, 16 V,+/- 10%, X7R, AEC-Q200

Grade 1, 0603 Samsung CL10B224KO8VPNC 1

C2,C3 CO1,CO2 CAP, CERM, 22 uF, 25 V, +/- 20%, X7R, 1210 Taiyo Yuden TMK325B7226MM-TR 2

C6 CVCC CAP, CERM, 1 µF, 16 V,+/- 10%, X7R, AEC-Q200

Grade 1, 0603 Taiyo Yuden EMK107B7105KAHT 1

C7,C14 CINHF,COUTHF CAP, CERM, 0.22 uF, 50 V, +/- 10%, X7R, AEC-Q200

Grade 1, 0603 TDK CGA3E3X7R1H224K080AB 2

C8,C9,C13 CIN1,CIN2,CF2 CAP, CERM, 4.7 µF, 50 V,+/- 10%, X7R, AEC-Q200

Grade 1, 1206 TDK CGA5L3X7R1H475K160AE 3

C10 CBLK CAP, AL, 47 uF, 63 V, +/- 20%, AEC-Q200 Grade 2,

SMD Panasonic EEE-HA1J470UP 1

C11,C12 CF1,CF3 CAP, CERM, 1 µF, 50 V,+/- 10%, X7R, AEC-Q200

Grade 1, 1206 Taiyo Yuden UMK316B7105KLHT 2

J1, J2 EN, SYNC/MODE Header, 100mil, 3x1, Gold, TH Samtec HTSW-103-07-G-S 2

J3, J4,J5 VOUT, VIN, GND Standard Banana Jack, Uninsulated, 8.9mm Keystone 575-8 3

L1 L1 Inductor, Shielded, Composite, 2.2 uH, 6.1 A, 0.0201

ohm, AEC-Q200 Grade 1, SMD Coilcraft XEL4030-222MEB 1

L2 Lf2 Inductor, Shielded, Metal Composite, 4.7 uH, 2.9 A,

0.076 ohm, SMD Wurth Elektronik 74438356047 1

L3 Lf1 Ferrite Bead, 600 Ω at 100 MHz, 3 A, 1210 Taiyo Yuden FBMH3225HM601NT 1

L4 L4 Coupled inductor, 0.015 Ω, AEC-Q200 Grade 1, SMD TDK ACM70V-701-2PL-TL00 0

R1 RINJ RES, 49.9, 1%, 0.1 W, AEC-Q200 Grade 0, 0603 Vishay-Dale CRCW060349R9FKEA 1

R2,R4 RFBT,RPU RES, 100 k, 1%, 0.1 W, AEC-Q200 Grade 0, 0603 Vishay-Dale CRCW0603100KFKEA 2

R3 RFBB RES, 24.9 k, 1%, 0.1 W, 0603 Yageo RC0603FR-0724K9L 1

TP1, TP2, TP3,

TP4, TP5, TP6,

TP7, TP8, TP9,

TP10,TP11,TP12

VINS, VOUTS, VIN_EMI,

EN, VOUT, GND,

TPGND2, TPGND1,

GNDS, RESET, SYNC

Terminal, Turret, TH, Double Keystone 1593-2 12

SH-J1, SH-J2 EN, SYNC/MODE Shunt, 100mil, Gold plated, Black Samtec SNT-100-BK-G 2

U1 LM63635CAQDRRRDN 3.5-V to 36-V, Automotive Step-down Voltage

Converter Texas Instruments LM63635CAQDRRRDN 1

Bill of Materials www.ti.com

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