Texas Instruments TPSM84424EVM User manual

SNVU581A–November 2017–Revised March 2018

Using the TPSM84824, TPSM84624, and TPSM84424EVM

User's Guide

SNVU581A–November 2017–Revised March 2018

Using the TPSM84824, TPSM84624, and TPSM84424EVM

The TPSM84824, TPSM84624, and TPSM84424 evaluation module (EVM) is designed as an easy-to-use

platform that facilitates an extensive evaluation of the features and performance of the TPSM84x24 power

module. This guide provides information on the correct usage of the EVM and an explanation of the

numerous test points on the board.

Contents

1 Description.................................................................................................................... 2

2 Getting Started............................................................................................................... 2

3 Test Point Descriptions ..................................................................................................... 3

4 Performance Data ........................................................................................................... 4

5 Bill of Materials (BOM) ...................................................................................................... 6

6 Schematic..................................................................................................................... 8

7 PCB Layout................................................................................................................... 9

List of Figures

1 EVM User Interface.......................................................................................................... 2

2 Efficiency (VIN = 12 V)....................................................................................................... 4

3 Efficiency (VIN = 5 V) ........................................................................................................ 4

4 EN Start-up Waveforms..................................................................................................... 4

5 EN Shutdown Waveforms .................................................................................................. 4

6 Transient Performance...................................................................................................... 4

7 TPSM84824EVM Schematic............................................................................................... 8

8 Topside Component Layout (Top View).................................................................................. 9

9 Topside Copper (Top View)................................................................................................ 9

10 Layer 2 Copper (Top View)............................................................................................... 10

11 Layer 3 Copper (Top View)............................................................................................... 10

12 Bottom-Side Copper (Top View) ......................................................................................... 11

13 Bottom-Side Component Layout (Bottom View) ....................................................................... 11

List of Tables

1 Output Voltage and Switching Frequency Jumper Settings............................................................ 3

2 Test Point Descriptions ..................................................................................................... 3

3 EVM Bill of Materials ........................................................................................................ 6

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Description

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1 Description

This EVM features the TPSM84824/624/424 synchronous buck power module configured for operation

with a 4.5-V to 17-V input voltage range. The output voltage can be set to one of six popular values by

using a configuration jumper. Similarly, the switching frequency can be set to one of six values with a

jumper. Additionally, the RTT resistor value, which selects the TurboTrans feature for improved transient

response, is also selectable using a jumper. The full output current rating of the device can be supplied by

the EVM. Input and output capacitors are included on the board to accommodate the entire range of input

and output voltages. Monitoring test points are provided to allow measurement of efficiency, power

dissipation, input ripple, output ripple, line and load regulation, and transient response. Control test points

and component footprints are provided for use of the ENABLE, PGOOD, and CLK features of the device.

The EVM uses a recommended PCB layout that maximizes thermal performance and minimizes output

ripple and noise.

2 Getting Started

Figure 1 highlights the user interface items associated with the EVM. The VIN Power terminal block (J1) is

used for connection to the host input supply and the VOUT Power terminal block (J2) is used for

connection to the load. These terminal blocks can accept up to 16-AWG wire.

Figure 1. EVM User Interface

The S+ and S- test points for both VIN and VOUT, located near the power terminal blocks are intended to

be used as voltage monitoring points where voltmeters can be connected to measure VIN and VOUT. Do

not use these S+ and S- monitoring test points as the input supply or output load connection

points. The PCB traces connecting to these test points are not designed to support high currents.

The VIN Scope (J3) and VOUT Scope (J4) test points can be used to monitor VIN and VOUT waveforms

with an oscilloscope. These test points are intended for use with un-hooded scope probes outfitted with a

low-inductance ground lead (ground spring) mounted to the scope probe barrel. The two sockets of each

test point are on 0.1 inch centers. The scope probe tip should be inserted into the socket marked with a

white dot, and the scope ground lead should be inserted into the other socket.

The control test points located to the left of the device are made available to test the features of the

device. The UVLO feature can be adjusted by changing resistors R24 and R25 on the bottom of the

board. An external voltage can be applied to the PULL_UP test point for the PGOOD signal. Refer to the

Test Points Descriptions section of this guide for more information on the individual control test points.

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Test Point Descriptions

SNVU581A–November 2017–Revised March 2018

Using the TPSM84824, TPSM84624, and TPSM84424EVM

The Fsw SELECT jumper (P1), the VOUT SELECT jumper (P2) and the RTT SELECT jumper (P3) are

provided for selecting the desired output voltage, the appropriate switching frequency and the appropriate

TurboTrans resistor value. Before applying power to the EVM, ensure that the jumpers are present and

properly positioned for the intended output voltage, switching frequency, and TurboTrans resistor value.

Refer to Table 1 for the recommended jumper settings. Always remove input power before changing the

jumper settings.

Table 1. Output Voltage and Switching Frequency Jumper Settings

VOUT Select Fsw Select RTT Select

1 V 350 kHz 2 kΩ

1.2 V 450 kHz 3 kΩ

1.8 V 600 kHz 6 kΩ

3.3 V 1000 kHz 11 kΩ

5 V 1250 kHz 18 kΩ

7.5 V 1350 kHz 28 kΩ

3 Test Point Descriptions

Wire-loop test points and two scope probe test points have been provided as convenient connection

points for digital voltmeters (DVM) or oscilloscope probes to aid in the evaluation of the device. A

description of each test point follows:

(1) Refer to the product datasheet for absolute maximum ratings associated with above features.

Table 2. Test Point Descriptions(1)

VIN S+ Input voltage monitor. Connect the positive lead of a DVM to this point for measuring efficiency.

VIN S– Input voltage monitor. Connect the negative lead of a DVM to this point for measuring efficiency.

VOUT S+ Output voltage monitor. Connect the positive lead of a DVM to this point for measuring efficiency, line

regulation, and load regulation.

VOUT S– Output voltage monitor. Connect the negative lead of a DVM to this point for measuring efficiency, line

regulation, and load regulation.

AGND Analog ground test point.

PGND Power ground test point.

VIN Scope (J3) Input voltage scope monitor. Connect an oscilloscope to this set of points to measure input ripple voltage.

VOUT Scope (J4) Output voltage scope monitor. Connect an oscilloscope to this set of points to measure output ripple

voltage and transient response.

ENABLE Enable test point. Connect this test point to AGND to disable the device. Leave this test point open to

enable the device.The UVLO resistor divider (R24 and R25) is connected at this point.

PGOOD Monitors the power good signal of the device. This is an open drain signal.

PULL_UP Test point provided for applying a pull-up voltage for the PGOOD signal. A 100-kΩpull-up resistor (R26) is

present on the EVM between this test point and the PGOOD signal.

CLK Synchronization clock input test point. An AC coupling capacitor (C13) is present on the EVM between this

test point and the SYNC pin of the device. Pads for a termination resistor (R27) are present between this

test point and PGND. An external clock signal can be applied to this point to synchronize the device to an

appropriate frequency.

Output Current (A)

Efficiency (%)

0 1 2 3 4 5 6 7 8

100

D001

VOUT, FSW

9.0 V, 1.3 MHz

7.5 V, 1.3 MHz

5.0 V, 1.2 MHz

3.3 V, 1.0 MHz

2.5 V, 800 kHz

1.8 V, 600 kHz

1.2 V, 450 kHz

1.0 V, 400 kHz

0.8 V, 300 kHz

Output Current (A)

Efficiency (%)

0 1 2 3 4 5 6 7 8

100

D002

VOUT, FSW

3.3 V, 1.0 MHz

2.5 V, 800 kHz

1.8 V, 600 kHz

1.2 V, 450 kHz

1.0 V, 400 kHz

0.8 V, 300 kHz

Performance Data

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4 Performance Data

Figure 2 through Figure 5 demonstrate the TPSM84824EVM performance. For more data regarding the

TPSM84824, TPSM84624, or the TPSM84424, please see the product data sheet.

Figure 2. Efficiency (VIN = 12 V) Figure 3. Efficiency (VIN = 5 V)

Figure 4. EN Start-up Waveforms Figure 5. EN Shutdown Waveforms

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Performance Data

SNVU581A–November 2017–Revised March 2018

Using the TPSM84824, TPSM84624, and TPSM84424EVM

Figure 6. Transient Performance

Bill of Materials (BOM)

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5 Bill of Materials (BOM)

See Table 3 for the TPSM84824EVM, TPSM84624EVM, or TPSM84424 bill of materials.

Table 3. EVM Bill of Materials

Designator Qty Value Description Package

Reference Part Number Manufacturer

C1, C2 2 10µF CAP, CERM, 10 µF, 25 V,+/- 10%, X7R, 1210 1210 GRM32DR71E106KA12L MuRata

C3, C4, C5, C6 4 47µF CAP, CERM, 47 µF, 10 V,+/- 10%, X7R, 1210 1210 GRM32ER71A476KE15L MuRata

C12 1 100µF CAP, AL, 100 µF, 50 V, +/- 20%, 0.162 ohm, TH EEUFC1H101B Panasonic

C13 1 47pF CAP, CERM, 47 pF, 50 V,+/- 1%, C0G/NP0, 0603 0603 GRM1885C1H470FA01J MuRata

J1, J2 2 Terminal Block, 5.08 mm, 2x1, Brass, TH 2x1 5.08 mm

Terminal Block ED120/2DS On-Shore Technology

J3, J4 2 Socket Strip, 2x1, 100mil, Black, Tin, TH Socket Strip,

100mil, 2pin 310-43-102-41-001000 Mill-Max

P1, P2, P3 3 Header, 100mil, 6x2, Tin, TH Header, 6x2,

100mil, Tin PEC06DAAN Sullins Connector Solutions

R1 1 10.0k RES, 10.0 k, 1%, 0.063 W, 0402 0402 CRCW040210K0FKED Vishay-Dale

R5 1 15.0k RES, 15.0 k, 1%, 0.1 W, 0603 0603 CRCW060315K0FKEA Vishay-Dale

R6 1 10.0k RES, 10.0 k, 1%, 0.1 W, 0603 0603 CRCW060310K0FKEA Vishay-Dale

R7 1 4.99k RES, 4.99 k, 1%, 0.1 W, 0603 0603 CRCW06034K99FKEA Vishay-Dale

R8 1 2.21k RES, 2.21 k, 1%, 0.1 W, 0603 0603 CRCW06032K21FKEA Vishay-Dale

R9 1 1.37k RES, 1.37 k, 1%, 0.1 W, 0603 0603 CRCW06031K37FKEA Vishay-Dale

R10 1 866 RES, 866, 1%, 0.063 W, 0603 0603 CRCW0603866RFKEA Vishay-Dale

R11 1 143k RES, 143 k, 1%, 0.1 W, 0603 0603 CRCW0603143KFKEA Vishay-Dale

R12 1 110k RES, 110 k, 1%, 0.1 W, 0603 0603 CRCW0603110KFKEA Vishay-Dale

R13 1 82.5k RES, 82.5 k, 1%, 0.1 W, 0603 0603 CRCW060382K5FKEA Vishay-Dale

R14 1 48.7k RES, 48.7 k, 1%, 0.1 W, 0603 0603 CRCW060348K7FKEA Vishay-Dale

R15 1 38.3k RES, 38.3 k, 1%, 0.1 W, 0603 0603 CRCW060338K3FKEA Vishay-Dale

R16 1 35.7k RES, 35.7 k, 1%, 0.1 W, 0603 0603 CRCW060335K7FKEA Vishay-Dale

R17, R28 2 2.00k RES, 2.00 k, 1%, 0.1 W, 0603 0603 CRCW06032K00FKEA Vishay-Dale

R18 1 3.01k RES, 3.01 k, 1%, 0.1 W, 0603 0603 CRCW06033K01FKEA Vishay-Dale

R19 1 6.04k RES, 6.04 k, 1%, 0.1 W, 0603 0603 CRCW06036K04FKEA Vishay-Dale

R20 1 11.3k RES, 11.3 k, 1%, 0.1 W, 0603 0603 CRCW060311K3FKEA Vishay-Dale

R21 1 18.2k RES, 18.2 k, 1%, 0.1 W, 0603 0603 CRCW060318K2FKEA Vishay-Dale

R22 1 28.0k RES, 28.0 k, 1%, 0.1 W, 0603 0603 CRCW060328K0FKEA Vishay-Dale

R23 1 0 RES, 0, 5%, 0.1 W, 0603 0603 ERJ-3GEY0R00V Vishay-Dale

R24 1 86.6k RES, 86.6 k, 1%, 0.1 W, 0603 0603 CRCW060386K6FKEA Vishay-Dale

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Bill of Materials (BOM)

SNVU581A–November 2017–Revised March 2018

Using the TPSM84824, TPSM84624, and TPSM84424EVM

Table 3. EVM Bill of Materials (continued)

Designator Qty Value Description Package

Reference Part Number Manufacturer

R25 1 30.9k RES, 30.9 k, 1%, 0.1 W, 0603 0603 CRCW060330K9FKEA Vishay-Dale

R26 1 100k RES, 100 k, 5%, 0.063 W, 0402 0402 CRCW0402100KJNED Vishay-Dale

SH-P1,

SH-P2

SH-P3 3 1x2 Shunt, 2mm, Gold plated, Black 2mm Shunt,

Closed Top 2SN-BK-G Samtec

TP1, TP2 2 Test Point, Multipurpose, Red, TH Multipurpose

Testpoint Red 5010 Keystone

TP3, TP4, TP9,

TP10 4 Test Point, Multipurpose, Black, TH Multipurpose

Testpoint Black 5011 Keystone

TP5, TP16, TP7,

TP8 4 Test Point, Multipurpose, White, TH Multipurpose

Testpoint White 5012 Keystone

U1 1 TPSM84824 MOL0024A (QFN-24) MOL0024A TPSM84824MOL Texas InstrumentsTPSM84624 MOL0024A (QFN-24) TPSM84624MOL

TPSM84424 MOL0024A (QFN-24) TPSM8424MOL

C7, C8, C9, C10 0 CAP, CERM, 1210 1210

C11 0 CAP, Tantalum Polymer, 7343-40 SMD 7343-40

C14 0 CAP, CERM, 0402 0402

C15, C16 0 CAP, CERM, 1210 1210

D1 0 Diode, Schottky, 30 V, 0.2 A, SOD-323 SOD-323 BAT54WS-7-F Diodes Inc.

R2, R3 0 RES, 0.1 W, 0603 0603

R4 0 RES, 0.063 W, 0402 0402

R27 0 RES, 1W, 2512 2512

TP11 0 Test Point. No entry in BOM. N/A

VIN

PGND

VOUT

PGND

VIN

AGND

TP5

TP3 TP4

15.0k

VIN

AGND

PGOOD

TP2

100µF

C12

PGND

VOUT

TP1

PGOOD TP7

2.00k

R28

PGND

10µF

VIN: 4.5V-17V VOUT: 0.6V-10V

TP9

TP10

VIN

PGND

DNC 4

PGOOD

AGND

9AGND 3

FB 2

SW 16

VOUT 1

VIN

PGND

RT/CLK

VOUT 8

PGND 12

PGND 21

SW 17

PGND

20 PGND

TT 5

SS/TRK 6

TPSM84824MOL

C14

47pF

C13

RTT

SELECT

1 2

3 4

5 6

7 8

9 10

11 12

C11

VOUT

SELECT

2.21k

10.0k

866

R10

1.37k

1.8V

1.2V

4.99k

Fsw

SELECT

1 2

3 4

5 6

7 8

9 10

11 12

48.7k

R14

143k

R11

110k

R12

82.5k

R13

1250kHz

1000kHz

450kHz

600kHz

38.3k

R15

350kHz

AGND

30.9k

R25

PGND

VOUT

R23

100k

R26

7.5V

910

1112

1.0V

3.01k

R18

10µF

VIN

11k

3.3V

PGND

CLK

VOUT

86.6k

R24

18k

28k

11.3k

R20

18.2k

R21

28.0k

R22

AGND

10.0k

AGND

PGND

R27

6.04k

R19

2.00k

R17

PULLUP TP6

TP8

47µF

35.7k

R16

1350kHz

C9 C10

C15 C16

TP12

Schematic

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6 Schematic

Figure 7 is the schematic for the TPSM84824EVM. The schematic for the TPSM84624EVM and TPSM84424EVM is identical with the only

difference is the U1 IC.

Figure 7. TPSM84824EVM Schematic

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PCB Layout

SNVU581A–November 2017–Revised March 2018

Using the TPSM84824, TPSM84624, and TPSM84424EVM

7 PCB Layout

Figure 8 through Figure 13 show the PCB layers of the TPSM84824EVM, TPSM84624EVM and

TPSM84424EVM.

Figure 8. Topside Component Layout (Top View)

Figure 9. Topside Copper (Top View)

PCB Layout

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Figure 10. Layer 2 Copper (Top View)

Figure 11. Layer 3 Copper (Top View)

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