Texas Instruments ALM2402FQ1EVM Bedienungsanleitung

SBOU227–September 2019

ALM2402F-Q1 Evaluation Module

User's Guide

SBOU227–September 2019

ALM2402F-Q1 Evaluation Module

This user's guide contains information and support documentation for the ALM2402F-Q1 evaluation

module (EVM). Included are the circuit description, jumper settings, required connections, printed circuit

board (PCB) layout, schematic, and bill of materials of the ALM2402FQ1EVM. Throughout this document,

the terms evaluation board, evaluation module, and EVM are synonymous with the ALM2402FQ1EVM.

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ALM2402F-Q1 Evaluation Module

Contents

1 Introduction ................................................................................................................... 3

2 EVM Circuit Description..................................................................................................... 3

3 Jumper Settings.............................................................................................................. 3

4 Power-Supply Connections................................................................................................. 5

5 Input and Output Connections ............................................................................................. 6

6 Modifications.................................................................................................................. 6

7 Schematic, PCB Layout, and Bill of Materials ........................................................................... 7

7.1 Schematic............................................................................................................ 7

7.2 PCB Layout.......................................................................................................... 7

7.3 Bill of Materials .................................................................................................... 13

List of Figures

1 Simplified ALM2402FQ1EVM Schematic................................................................................. 3

2 ALM2402FQ1 Evaluation Module Default Jumper Settings............................................................ 4

3 ALM2402FQ1EVM Configured With Independent Input-Stage and Output-Stage Supplies ...................... 5

4 ALM2402FQ1EVM Input and Output Connections...................................................................... 6

5 ALM2402FQ1EVM Schematic ............................................................................................. 7

6 Top Overlay PCB Layout ................................................................................................... 8

7 Top Layer PCB Layout...................................................................................................... 9

8 Ground Layer PCB Layout................................................................................................ 10

9 Power Layer PCB Layout ................................................................................................. 11

10 Bottom Layer PCB Layout ................................................................................................ 12

List of Tables

1 Default Jumper Configuration.............................................................................................. 4

2 ALM2402FQ1EVM Supply-Range Specifications ....................................................................... 5

3 ALM2402FQ1EVM Input and Output Connections...................................................................... 6

4 ALM2402FQ1EVM Bill of Materials...................................................................................... 13

Trademarks

All trademarks are the property of their respective owners.

VCC_S

Vmid

VCC_S

SH_DN/OTF

VCC_S VCC_S VCC_S

VCC_S

VS VS_O1

IN1-

IN1+ EN

OUT1

VS_O2

IN2+

IN2- EN

OUT2

GND

Thermal

Shutdown

SH_DN/OTF EN

GND 156

GND

(TAB)

U1 ALM2402F-Q1

10kŸ

R12

10kŸC2

100nF

10kŸ

24.9kŸ

R16

10kŸ

R17

24.9kŸ

150nF

C17

150nF

R20

10kŸ

MBRS2040LT3G

C5 10uF

J7.1

C4 100nF C5

100nF

C10

100nF

J3.1

J3.4

J7.2

100nF

C14

100nF

J3.2

J3.3

SMA Connector

Power Supply

Connector

Output

Connector

INPUT1 -

INPUT2 -

OUTPUT1

OUTPUT2

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Introduction

SBOU227–September 2019

ALM2402F-Q1 Evaluation Module

1 Introduction

The ALM2402F-Q1 is an automotive-grade, dual high-voltage, high-current operational amplifier (op amp)

with protection features from Texas Instruments. For a full list of electrical characteristics for the

ALM2402F-Q1, see the ALM2402F-Q1 Automotive, Dual Operational Ampilfier With High Current Output

data sheet.

2 EVM Circuit Description

This EVM is designed to provide access to the features, and measure the performance, of the ALM2402F-

Q1. By default, the ALM2402FQ1EVM has both amplifiers configured in the inverting configuration with a

gain of –2.5 V/V. A simplified schematic of the ALM2402FQ1EVM is displayed in Figure 1. For a full

schematic of the ALM2402FQ1EVM, see Section 7.1.

Figure 1. Simplified ALM2402FQ1EVM Schematic

3 Jumper Settings

Figure 2 details the default jumper settings of the ALM2402FQ1EVM. Table 1 explains the configuration

for these jumpers.

Jumper Settings

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Figure 2. ALM2402FQ1 Evaluation Module Default Jumper Settings

Table 1. Default Jumper Configuration

Jumper Function Default Position Description

J5 VCC_S reverse polarity

protection Shunt 2-3 Shunt 2-3: Schottky diode blocks VCC-S supply reverse current

Shunt 1-2 bypasses VCC_S Schottky diode protection

J8 VCC1 source Shunt 1-2 Shunt 1-2 selects VCC_S for op amp1 output supply

Shunt 2-3 selects VCC_1 for op amp 1 output supply

J10 VCC2 source Shunt 1-2 Shunt 1-2 selects VCC_S for op amp2 output supply

Shunt 2-3 selects VCC_2 for op amp 2 output supply

J9 SH_DN / OTF Shunt 2-3 Overtemperature flag or shutdown:

Shunt 2-3 turns on amplifiers; pin works as overtemperature flag

Shunt 1-2 shuts down amplifiers

VCC_S VCC_1

VCC_2

VS VS_O1

IN1-

IN1+ EN

OUT1

VS_O2

IN2+

IN2- EN

OUT2

GND

Thermal

Shutdown

SH_DN/OTF EN

GND 156

GND

(TAB)

U1 ALM2402F-Q1

C4 100nF

100nF

C10

100nF

10uF

C18 100nF

C19

VCC_1

VCC_S

VCC_2

10uF

C22 100nF

C23

10uF

C25 100nF

C26

GND

1 2 3

J10

VCC_S

Power Supply

connector

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Power-Supply Connections

SBOU227–September 2019

ALM2402F-Q1 Evaluation Module

4 Power-Supply Connections

The power-supply connections for the ALM2402FQ1EVM are provided through connector J7 at the top of

the EVM. Table 2 summarizes the pin definition for supply connector J7, and the allowed voltage range for

each supply connection.

Table 2. ALM2402FQ1EVM Supply-Range Specifications

Pin Number Supply Connection Voltage Range

J7.1 Input stage supply (VCC) 4.5 V to 16 V

J7.2, J7.4, J7.6 Ground 0 V

J7.3 Op amp 1 output supply (VCC_1) 3 V to 16 V

J7.5 Op amp 2 output supply (VCC_2) 3 V to 16 V

By default, the ALM2402FQ1 is configured to use a single supply connected through J7.1 (VCC) and J7.2

(GND) with jumpers J8 and J10 set to shunt pins 1-2. Alternatively, the EVM can be configured to use

three independent power-supply connections: input stage supply (VCC), op amp 1 output supply (VCC_1),

and op amp 2 output supply (VCC_2). Setting jumpers J8 and J10 to shunt pins 2-3 allows the use of

independent voltage supplies as indicated in Figure 3.

Figure 3. ALM2402FQ1EVM Configured With Independent Input-Stage and Output-Stage Supplies

Vmid

SH_DN/OTF

VCC_S VCC_S

VCC_S

VS VS_O1

IN1-

IN1+ EN

OUT1

VS_O2

IN2+

IN2- EN

OUT2

GND

Thermal

Shutdown

SH_DN/OTF EN

GND 156

GND

(TAB)

U1 ALM2402F

R4 10k R3 24.9k

R16 10k R17 24.9k

C3 150n

C17 150n

C4 100n C5 100n

C10 100n

J3.1

J3.4

C14 10n

J3.2

J3.3

R14

C1 150n

C6 150n

TP1

TP2

TP7

TP10

C8 10n

TP3

TP6

TP8

TP9

SMA Connector

Output

Connector J3

SMA Connector

Note: SMA connectors J2 and J4 are not populated.

Resistor R6 and R14 are not populated.

IN1-

IN1+

IN2+

IN2-

DNP

Input and Output Connections

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5 Input and Output Connections

Input signal connections for the ALM2402FQ1EVM are provided through the use of the SMA connectors

and test points located at the left of the EVM. The dual output-amplifier connections are provided through

connector J3 and test points located at the right side of the EVM. A simplified diagram of the

ALM2402FQ1EVM input and output connections is displayed in Figure 4.

Figure 4. ALM2402FQ1EVM Input and Output Connections

Table 3 summarizes the input and output connectors and corresponding test points.

Table 3. ALM2402FQ1EVM Input and Output Connections

Connector

Designator Signal Comment Test Point

J1 IN1– SMA TP1

J2 IN1+ SMA (not populated) TP2

J4 IN2+ SMA (not populated) TP7

J6 IN2– SMA TP10

J3.1 OUT1 Screw terminal TP3

J3.2 GND Screw terminal TP8

J3.3 GND Screw terminal TP9

J3.4 OUT2 Screw terminal TP6

6 Modifications

By default, the ALM2402FQ1EVM is populated with both amplifiers set to the inverting configuration.

However, for flexibility, the PCB layout has additional unpopulated passive component footprints, and

additional input connections. These additional component footprints in the layout allow the user to change

the ALM2402FQ1 circuit to other common configurations, such as the buffer and noninverting amplifier

configurations. For a full schematic of the ALM2402FQ1EVM, see Figure 5.

10uF

C18 100nF

C19

10nF

50V

C12

24.9k

10.0k

R9 VCC_2

GND

100nF

C4 100nF

50V

100nF

C10

GND GND

GND

VCC_S VCC_1

R2 C2

GND

24.9k

R17

10.0k

R16

R11

R14

R19 C21

R18

C20

GND

R15

C16

R13

C13

GND

R10

10nF

50V

C14

GND

10.0k

R12

GND

VCC_S

100nF

C11

GND

VCC_1

VCC_S

VCC_2

10uF

C22 100nF

C23

10uF

C25 100nF

C26

GND

MBRS2040LT3G

GND

J10

VCC_S

TP1

IN1-

TP2

IN1+

GND

C24

GND

TP7

IN2+

TP10

IN2-

GND

TP4

GND

TP11

GND

TP14

GND

10.0k

R20

VCC_S

TP13

TP8

GND

TP3

OUT1

TP6

OUT2

TP9

GND

TP12

GND

TP5

GND

ALM2402FQPWPRQ1

IN1-

IN1+

SH_DN/OTF

IN2+

IN2-

GND

NC 7

NC 8

OUT2 9

VS_O2 10

VS_O1 12

OUT1 13

GND 14

Thermal

Shutdown

GND 15

150nF

50V

150nF

50V

150nF

50V

C15

150nF

50V

C17

DNP

DNP DNP DNP DNP

DNP DNP DNP

DNP

Note: DNP components are not populated.

DNP

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Schematic, PCB Layout, and Bill of Materials

SBOU227–September 2019

ALM2402F-Q1 Evaluation Module

7 Schematic, PCB Layout, and Bill of Materials

This section contains the schematic, bill of materials, and references for the ALM2402FQ1EVM.

7.1 Schematic

Figure 5 illustrates the EVM schematic.

Figure 5. ALM2402FQ1EVM Schematic

7.2 PCB Layout

The ALM2402FQ1EVM is a four-layer PCB design. Figure 6 to Figure 9 show the PCB layer illustrations.

The top layer consists of all signal path traces, and is poured with a solid ground plane. A symmetrical

board layout is used on amplifier 1 and amplifier 2 to keep good performance matching. Decoupling

capacitors C4, C5, and C10 are positioned on the top layer as close as possible to the power supply pins

of the device. The second internal layer is a dedicated solid GND plane. Independent vias are placed at

the ground connection of every component to provide a low-impedance path to ground. The third internal

layer and the bottom layer route the power-supply connections.

Schematic, PCB Layout, and Bill of Materials

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Figure 6. Top Overlay PCB Layout

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Schematic, PCB Layout, and Bill of Materials

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ALM2402F-Q1 Evaluation Module

Figure 7. Top Layer PCB Layout

Schematic, PCB Layout, and Bill of Materials

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Figure 8. Ground Layer PCB Layout

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