Texas Instruments TPS7A21EVM-059 Manuale utente

User’s Guide

TPS7A21EVM-059 Evaluation Module

ABSTRACT

Figure 1-1. TPS7A21EVM-059 Evaluation Module

This user's guide describes the operational use of the TPS7A21EVM-059 evaluation module (EVM) as a

reference design for engineering demonstration and evaluation of the TPS7A21 low-dropout linear regulator

(LDO). Included in this user's guide are setup and operating instructions, thermal and layout guidelines, a

printed-circuit board (PCB) layout, a schematic diagram, and a bill of materials (BOM).

Throughout this document, the terms evaluation board, evaluation module, and EVM are synonymous with the

TPS7A21EVM-059.

Table of Contents

1 Trademarks..............................................................................................................................................................................2

2 Introduction.............................................................................................................................................................................3

3 Setup........................................................................................................................................................................................3

3.1 LDO Input/Output Connector Descriptions.........................................................................................................................3

3.2 Optional Load Transient Input/Output Connector Descriptions..........................................................................................3

3.3 TPS7A21 LDO Operation...................................................................................................................................................5

3.4 Optional Load Transient Circuit Operation.........................................................................................................................6

4 Board Layout...........................................................................................................................................................................8

5 TPS7A21 EVM Schematic.................................................................................................................................................... 10

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

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TPS7A21EVM-059 Evaluation Module 1

List of Figures

Figure 1-1. TPS7A21EVM-059 Evaluation Module..................................................................................................................... 1

Figure 3-1. TPS7A21EVM-059 Turn On......................................................................................................................................5

Figure 3-2. TPS7A21EVM-059 With Current Probes Attached................................................................................................... 6

Figure 3-3. TPS7A21EVM-059 Load Transient Results.............................................................................................................. 7

Figure 4-1. Top Assembly Layer and Silk Screen........................................................................................................................8

Figure 4-2. Top Layer Routing..................................................................................................................................................... 8

Figure 4-3. Layer 2...................................................................................................................................................................... 8

Figure 4-4. Layer 3...................................................................................................................................................................... 8

Figure 4-5. Bottom Layer Routing................................................................................................................................................9

Figure 4-6. Bottom Assembly Layer and Silk Screen.................................................................................................................. 9

Figure 5-1. Schematic................................................................................................................................................................10

1 Trademarks

LeCroy™ is a trademark of Teledyne LeCroy.

Kapton® is a registered trademark of DuPont.

All trademarks are the property of their respective owners.

Trademarks www.ti.com

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2 Introduction

The Texas Instruments TPS7A21EVM-059 evaluation module (EVM) helps designers evaluate the operation and

performance of the TPS7A21 LDO voltage regulator. As shown in Table 2-1, the TPS7A21EVM-059 contains

one TPS7A21 LDO voltage regulator in the DSBGA package. An optional load transient circuit is also included

to assist the user with high-speed load transient testing. An input current loop is included that allows fast

measurements of the input current.

Table 2-1. Device Information

EVM ORDERABLE NUMBER VOUT PART NAME PACKAGE

TPS7A21EVM-059 3.3 V TPS7A2133PYWDJ 4-pin DSBGA

3 Setup

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

the TPS7A21EVM-059. Section 3.1 and Section 3.3 describe the test setup and operation for the TPS7A21

LDO. Section 3.2 and Section 3.4 describe the test setup and operation of the optional load transient circuit.

3.1 LDO Input/Output Connector Descriptions

3.1.1 VIN and GND

VIN and GND are the connection terminals for the input supply. The VIN terminal is the positive connection, and

the GND terminal is the negative (that is, ground) connection.

3.1.2 VOUT and GND

VOUT and GND are the connection terminals for the output load. The VOUT terminal is the positive connection,

and the GND terminal is the negative (that is, ground) connection.

3.1.3 EN

EN is a 3-pin header used to enable or disable the TPS7A21.

The center pin of the 3-pin header is tied to the TPS7A21 EN input. When the 2-pin shunt is placed across the

top two pins of the header, VIN is shorted to EN, and the TPS7A21 is enabled. When the 2-pin shunt is placed

across the bottom two pins of the header, GND is shorted to EN, and the TPS7A21 is disabled. Alternatively,

the 3-pin header can remain floating. The TPS7A21 includes an internal smart enable pulldown resistor, which

ties the EN pin to GND through an internal 500-kΩ resistor. If the 3-pin header is floating, the TPS7A21 remains

disabled.

When driving the EN terminal with an off-board supply or signal generator, the applied voltage must be kept

between 0 V and 6.5 V.

3.2 Optional Load Transient Input/Output Connector Descriptions

3.2.1 VDD and GND

VDD and GND are the connection terminals for the input supply of the load transient circuit. The VDD terminal is

the positive connection, and the GND terminal is the negative (that is, ground) connection.

3.2.2 J10

J10 is an optional connection for the user to make measurements or apply loads to the output of the LDO.

3.2.3 J12

J12 is an optional connection to insert a damping circuit across the load transient MOSFET drain to source

voltage.

3.2.4 J13

J13 is an optional connection to insert capacitance or additional load across the drain to source of the load

transient MOSFET.

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3.2.5 J16

J16 is a high-frequency kelvin connection that allows accurate measurements of the load transient MOSFET

drain to source voltage.

3.2.6 J17

J17 is the connection for the function generator to drive the gate driver device. J17 is terminated by the 50-Ω

resistor, R12.

3.2.7 J19

J19 is a high-frequency kelvin connection that allows accurate measurements of the load transient MOSFET

gate to source voltage.

3.2.8 TP2 and TP3

TP2 and TP3 allow the user to measure the gate drive resistance R8 when power is turned off to the EVM.

3.2.9 TP4

TP4 is the enable pin to enable the gate driver device. Tie this pin to GND to enable the gate driver.

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3.3 TPS7A21 LDO Operation

The TPS7A21EVM-059 evaluation module contains the TPS7A21 LDO with input and output capacitors

installed. These three components provide the minimum required solution size, as illustrated by the white boxes

in Figure 1-1. Additional pads are available to test the LDO with additional input and output capacitors beyond

what is already installed on the EVM. The TPS7A21 LDO can be enabled or disabled by using the J5 3-pin

header.

1. Place a 2-pin shunt across the header to tie VIN to EN to enable the device.

2. Place a 2-pin shunt across the header to tie GND to EN, or leave the 3-pin header floating to disable the

device.

Alternatively, by connecting an external function generator to TP1 (EN) and a nearby GND post (J6), the

user can enable or disable the TPS7A21 LDO after VIN is applied. Figure 3-1 shows the result of the

TPS7A21EVM-059 during turn on. The blue trace is the enable voltage, and the red trace is the output voltage.

Figure 3-1. TPS7A21EVM-059 Turn On

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TPS7A21EVM-059 Evaluation Module 5

If desired, a current probe can be inserted in the EVM as shown in Figure 3-2 to measure the input and output

current. The slots were sized to fit most current probes, such as the LeCroy™ AP015 or CP031 current probes.

Figure 3-2. TPS7A21EVM-059 With Current Probes Attached

The user has two options for providing a DC load on the output of the TPS7A21. J7 can be used to place a

DC load that flows through the current sense path on the output of the LDO. Alternatively, the J4 (VOUT) and

J9 (GND) banana connectors can be used for external measurements and loading; however, the IOUT loop

does not sense current flowing through these connectors. In cases where very fast transient tests are performed,

ringing may be observed on VIN or VOUT as a result of the parasitic inductance within the PCB of the EVM. A

strip of wire placed on the exposed copper in the current path can reduce this ringing. Select the correct size of

additional wire to fill the volume of the current probe. For most current probes, a 10 AWG wire can be used.

WARNING

The sensors of some current probes are tied to GND and cannot come into contact with energized

conductors. See the user manual of your current probe for details. If your current probe has this

limitation, use a thin strip of electrical or Kapton® tape to isolate the current sense path from the

current probe.

Optional kelvin sense points are provided using the SMA connectors J1 (VIN) and J2 (VOUT).

3.4 Optional Load Transient Circuit Operation

The TPS7A21EVM-059 evaluation module contains an optional high-performance load transient circuit to allow

efficient testing of the TPS7A21 LDO load transient performance. To use the optional load transient circuit, install

the correct components in accordance with the application. Modify the input and output capacitance connected

to the TPS7A21 LDO to match the expected operating conditions. Determine the desired peak current to test,

and modify the parallel resistor combination of R2, R3, R4, R5, and R6 as shown:

OUT

Peak

2 3 4 5 6

R R R R R

(1)

Setup www.ti.com

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The slew rate of the load step can be adjusted by C9, R7, and R8. In this section, only R8 is adjusted to set the

slew rate. For a 0-mA to 500-mA load step, use Table 3-1 to select a value of R8 that results in the desired rise

or fall time.

Table 3-1. Suggested Ramp Rate Resistor Values

R8 Rise Time Fall Time

54.9 kΩ 6 µs 10 µs

27.4 kΩ 3 µs 5 µs

13.6 kΩ 1.5 µs 2.8 µs

6.81 kΩ 750 ns 1.5 µs

3.4 kΩ 500 ns 750 ns

1.69 kΩ 200 ns 500 ns

845 Ω 100 ns 200 ns

422 Ω 50 ns 100 ns

210 Ω 30 ns 50 ns

105 Ω 20 ns 30 ns

After the EVM is modified (if needed), connect a power supply to banana connectors J14 (VDD) and J18 (GND)

with a 5-V DC supply and a 1-A DC current limit. As shown in Figure 3-3, the TPS7A21 transient response is

very fast and the output voltage recovers in well under 1 ms after the initial load transient. Therefore, use a load

transient pulse duration limit of 1 ms to prevent excessive heating of the pulsed resistors (R2, R3, R4, R5, and

R6). Configure a function generator for the 50-Ω output, in a 0-V DC to 5-V DC square pulse. If necessary, burst

mode can be configured in the function generator for repetitive, low duty cycle, load transient testing.

A 3.4-kΩ resistor is installed on the EVM at R8. This resistor provides approximately 1 A/μs slew rate from 0 mA

to 500 mA. Figure 3-3 provides example test data with R8 = 3.4 kΩ. The red trace is the output voltage and the

blue trace is the output current. J7 provides 1 mA of DC load current and R2, R3, R4, R5, and R6 provide 499

mA of pulsed load. The resulting test data shows a 1-mA to 500-mA load step on VOUT of the LDO, with only a

1-μF capacitor on the output of the LDO.

Figure 3-3. TPS7A21EVM-059 Load Transient Results

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4 Board Layout

Figure 4-1 through Figure 4-6 show the board layout for the TPS7A21EVM-059 PCB.

The TPS7A21EVM-059 dissipates power, which may cause some components to experience an increase in

temperature. The TPS7A21 LDO, LMG1020YFFR gate driver, and pulsed resistors R2, R3, R4, R5, and R6 are

most at risk of raising to a high junction temperature during normal operation.

Figure 4-1. Top Assembly Layer and Silk Screen Figure 4-2. Top Layer Routing

Figure 4-3. Layer 2 Figure 4-4. Layer 3

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Figure 4-5. Bottom Layer Routing Figure 4-6. Bottom Assembly Layer and Silk

Screen

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TPS7A21EVM-059 Evaluation Module 9

5 TPS7A21 EVM Schematic

Figure 5-1 shows a schematic for the TPS7A21EVM-059.

Re vis ion His tory

Rev Note sAppro ve d b yEC N # Appro ve d Da te

N/A N/A N/A N/A N/A

GND

3.40k

1.00k

TP1

GND

2.2µF

50V

2.2µF

50V

GND

2.2µF

10V

2.2µF

10V

1uF

10V

1uF

J3 J 4

J9J8

VOUT

GND

VIN

Vin Max = 6.5V

Vout Max = 6.5V

Iout Max = 500mA

1nF

100V

C14

TP2 TP3

VDD

A1 OUTH A2

OUTL B2

IN-

C2 GND B1

IN+

LMG1020YFFR

J17

J 14

VDD

J 18

GND

50V

10uF

C12

50V

10uF

C11

1.00k

GND B2

OUT A2

TPS7A2133PYWDJ

J 10

50V

0.1uF

C13

2.2µF

10V

2.2uF

154

1 2

3 4

J 11

GND

VIN

VOUT

154

100V

1pF

R10

5,6,84,7

1,2,

C S D173 13 Q2

J19 1nF

100V

C15

R11

J 12 J 13

J16

50V

0.015uF

C10

49.9

R12

GND

J 15

TP4

Figure 5-1. Schematic

TPS7A21 EVM Schematic www.ti.com

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