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User’s Guide
ALM2403-Q1 Evaluation Module
ABSTRACT
This user's guide contains information and support documentation for the ALM2403-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 ALM2403Q1EVM. Throughout this document, the terms evaluation
board, evaluation module, and EVM are synonymous with the ALM2403Q1EVM.
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Table of Contents
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Table of Contents
1 Overview..................................................................................................................................................................................3
1.1 Related Documentation......................................................................................................................................................3
1.2 Electrostatic Discharge Caution......................................................................................................................................... 3
1.3 Hot Surface Warning.......................................................................................................................................................... 3
2 EVM Circuit Description.........................................................................................................................................................4
3 Jumper Settings......................................................................................................................................................................5
4 Power-Supply Connections................................................................................................................................................... 6
5 Input and Output Connections.............................................................................................................................................. 7
6 Modifications...........................................................................................................................................................................8
7 Schematic, PCB Layout, and Bill of Materials......................................................................................................................8
7.1 Schematic.......................................................................................................................................................................... 8
7.2 PCB Layout........................................................................................................................................................................ 8
7.3 Bill of Materials.................................................................................................................................................................14
8 Revision History................................................................................................................................................................... 15
List of Figures
Figure 2-1. ALM2403Q1EVM Simplified Schematic.................................................................................................................... 4
Figure 3-1. ALM2403Q1EVM Default Jumper Settings............................................................................................................... 5
Figure 4-1. ALM2403Q1EVM Voltage Supply Connections........................................................................................................ 6
Figure 7-2. Top Overlay PCB Layout........................................................................................................................................... 9
Figure 7-3. Top Layer PCB Layout............................................................................................................................................ 10
Figure 7-4. Ground Layer PCB Layout.......................................................................................................................................11
Figure 7-5. Power Layer PCB Layout........................................................................................................................................ 12
Figure 7-6. Bottom Layer PCB Layout.......................................................................................................................................13
List of Tables
Table 1-1. Related Documentation.............................................................................................................................................. 3
Table 3-1. Default Jumper Configuration..................................................................................................................................... 5
Table 4-1. ALM2403Q1EVM Supply-Range Specifications......................................................................................................... 6
Table 5-1. ALM2403Q1EVM Input and Output Connections....................................................................................................... 7
Table 7-1. ALM2403Q1EVM Bill of Materials.............................................................................................................................14
Trademarks
All trademarks are the property of their respective owners.
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Overview
1 Overview
The ALM2403-Q1 is an automotive-grade, high-voltage, high-current, dual operational amplifier (op amp) with
wide bandwidth and thermal protection from Texas Instruments. For a full list of electrical characteristics for the
ALM2403-Q1, see the ALM2403-Q1 24-V, High Current, Wide-Bandwidth, Dual Operational Amplifier data sheet.
1.1 Related Documentation
The following document provides information regarding Texas Instruments integrated circuits used in the
assembly of the ALM2403Q1EVM. This user's guide is available from the TI website under literature number
SBOU236. Any letter appended to the literature number corresponds to the document revision that is current
at the time of the writing of this document. Newer revisions may be available from the TI website at http://
www.ti.com/, or call the Texas Instruments Literature Response Center at (800) 477-8924 or the Product
Information Center at (972) 644-5580. When ordering, identify the document by both title and literature number.
Table 1-1. Related Documentation
Device
Literature Number
ALM2403-Q1
SBOS928
1.2 Electrostatic Discharge Caution
Many of the components on the ALM2403Q1EVM are susceptible to damage by electrostatic discharge (ESD).
Customers are advised to observe proper ESD handling precautions when unpacking and handling the EVM,
including the use of a grounded wrist strap at an approved ESD workstation.
1.3 Hot Surface Warning
WARNING
Device may become hot under high-current conditions. Take care when handling the EVM.
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EVM Circuit Description
2 EVM Circuit Description
This EVM provides access to the features, and measure the performance, of the ALM2403-Q1. By default,
the ALM2403Q1EVM has both amplifiers configured in the inverting configuration with a gain of –2.5 V/V.
A simplified schematic of the ALM2403Q1EVM is displayed in Figure 2-1. For a full schematic of the
ALM2403EVM, see Figure 7-1.
Power Sup ply
Conne ctor
R3
24.9 k
D1
J7.1
J7.2
VCC_S
C18
10 …F
VCC_S
C10
100 nF
VCC_S
C4
100 nF
C5
100 nF
U1 ALM2403-Q1
SMA
Conne ctor
11
R4
10 k
1
INP UT1 ± J1
VCC
VCC
IN1±
Output
Conne ctor
A1
2
IN1 +
12
+
OUT1
13
EN
+
J3.1 OUTPUT1
VCC_S
J3.2
Vmid
VCC 10
4
SMA
Conne ctor
INP UT2 ± J6
R16
10 k
J3.3
IN2 +
+
+
A2
5
IN2±
OUT2
-
6
NC
SH_DN/OTF
EN
8
7
NC
Thermal
Shu tdo wn
GND
J3.4 OUTPUT2
EN
SH_DN/OTF
3
9
GND
GND
14
15
R17
24.9 k
VCC_S
R20
10 k
R21
10 k
SH_DN/OTF
C22
100 nF
Figure 2-1. ALM2403Q1EVM Simplified Schematic
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Jumper Settings
3 Jumper Settings
Figure 3-1 details the default jumper settings of the ALM2403Q1EVM. Table 3-1 explains the configuration for
these jumpers.
Figure 3-1. ALM2403Q1EVM Default Jumper Settings
Table 3-1. Default Jumper Configuration
Jumper
Function
J5
VCC_S reverse polarity
protection
Default Position
Shunt 2-3
Shunt 2-3: Schottky diode blocks VCC-S supply reverse current
Shunt 1-2 bypasses VCC_S Schottky diode protection
Description
J8
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
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Power-Supply Connections
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4 Power-Supply Connections
The power-supply connections for the ALM2403Q1EVM are provided through connector J7 at the top of the
EVM. Table 4-1 summarizes the pin definition for supply connector J7, and the allowed voltage range for each
supply connection.
Table 4-1. ALM2403Q1EVM Supply-Range Specifications
Pin Number
Supply Connection
Voltage Range
J7.1
Input stage supply (VCC)
5 V to 24 V
J7.2
Ground
0V
The ALM2403Q1 is configured to use a single supply connected through J7.1 (VCC) and J7.2 (GND). By default,
jumper J5 is set to shunt pins 2-3 placing a Schottky diode (D1) in series with the power supply connection. The
Schottky diode blocks any reverse current into the VCC_S supply during a fault condition when the output of
the amplifier is shorted to a higher potential than the VCC_S supply. Place J5 to shunt pins 1-2 to bypass the
optional diode (D1). Figure 4-1 shows the ALM2403Q1EVM voltage supply connections.
VCC_S
VCC_S
C4
100 nF
1 2 3
11
J5
1
Power-Supply
Connector
GND
U1 ALM2403-Q1
VCC
IN1±
VCC
D1
1
VCC_S
C18
10 µF
C19
100 nF
GND
2
IN1+
+
OUT1
IN2+
VCC_S
IN2±
+
OUT2
-
EN
NC
3
6
SH_DN/OTF
GND
C10
100 nF
10
+
A2
5
13
EN
+
VCC
4
12
A1
J7
2
C5
100 nF
EN
Thermal
Shutdown
NC
GND
GND
9
8
7
14
15
Figure 4-1. ALM2403Q1EVM Voltage Supply Connections
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Input and Output Connections
5 Input and Output Connections
Input signal connections for the ALM2403Q1EVM 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 ALM2403Q1EVM input and
output connections is displayed in Figure 5-1.
SMA
Conne ctor
IN1±
TP1
C3
150 nF
R3
24.9kŸ
J1
VCC_S
VCC_S
TP3
Output
Conne ctor
J3
J3.1
SMA
Conne ctor
IN1 +
TP2
C6
150 nF
11
R6
DNP
1
J2
VCC
VCC
IN1±
-
DNP
A1
2
IN1 +
+
OUT1
VCC_S
VCC
IN2 +
IN2 +
A2
TP7
R14
DNP
5 IN2±
OUT2
-
EN
SH_DN/OTF
J4
3
DNP
6
NC
SH_DN/OTF
GND
J3.2
10
TP9
+
+
SMA
Conne ctor
TP8
13
EN
+
Vmid
4
12
EN
NC
Thermal
Shu tdo wn
GND
GND
J3.3
9
8
TP6
7
14
J3.4
15
U1 ALM2403-Q1
SMA
Conne ctor
IN2±
TP10
R16
10 k
R17 24 .9 k
J6
Note: SMA connectors J2 and J4 are not populated. Resistors R6 and R14 are not populated.
Figure 5-1. ALM2403Q1EVM Input and Output Connections
Table 5-1 summarizes the input and output connectors and corresponding test points.
Table 5-1. ALM2403Q1EVM 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
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Modifications
6 Modifications
By default, the ALM2403Q1EVM 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 ALM2403Q1
circuit to other common configurations, such as the buffer and noninverting amplifier configurations. For a full
schematic of the ALM2403Q1EVM, see Figure 7-1.
7 Schematic, PCB Layout, and Bill of Materials
This section contains the schematic, bill of materials, and references for the ALM2403Q1EVM.
7.1 Schematic
Figure 7-1 illustrates the EVM schematic.
GND
TP1
J1
R4
1
150nF
50V
GND
C7
TP4
GND
DNP C6
150nF
50V
GND
VCC_S
TP5
GND
J4
R12
10.0k
GND
TP7
R7
2
0
R11
C11
100nF
4
0
GND
5
DNP
C13
GND
GND
1
C9
R9
3
DNP
C15
R13
R14
1
DNP
IN2+
DNP
VCC_S
6
150nF
50V
C5
100nF
U1
GND
11
DNP
DNP
R8
10.0k
GND
GND
5.6pF
DNP R5
DNP
IN1+
C2
0
24.9k
VCC_S
10.0k
R6
1
DNP
R2
C4
100nF
TP2
J2
R1
DNP
R3
C3
IN1-
C1
DNP
DNP C16
GND
VCC
VCC
IN1-
OUT1
A1
IN1+
EN
VCC
IN2+
OUT2
A2
IN2-
EN
SH_DN/OTF
NC
NC
EN
Thermal
Shutdown
GND
GND
GND
TP3
12
OUT1
13
VCC_S C10
10
50V
100nF
9
8
7
DNPC8
J3
1
2
3
4
DNP
R10
GND
DNP C12
TP6
GND
OUT2
DNPC14
14
15
TP8 TP9
GND GND
GND
ALM2403QPWPRQ1
TP10
J6
GND
DNP R15
C17
R16
1
IN2-
TP11
GND
150nF
50V
TP12
GND
GND
10.0k
R17
GND
GND
24.9k
5.6pF
0
DNP DNP
GND
C20
VCC_S
GND
GND
GND
GND
R20
10.0k
J8
1
2
3
R18
R19
C21
TP13
J5
R21
10.0k
TP14
GND
GND
C22
GND
GND
1 2 3
J7
2
1
D1
VCC_S
C18
10uF
GND
C19
100nF
GND
Note: DNP components are not populated.
Figure 7-1. ALM2403Q1EVM Schematic
7.2 PCB Layout
The ALM2403Q1EVM is a four-layer PCB design. Figure 7-2 to Figure 7-6 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.
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Figure 7-2. Top Overlay PCB Layout
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Schematic, PCB Layout, and Bill of Materials
Figure 7-3. Top Layer PCB Layout
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Figure 7-4. Ground Layer PCB Layout
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Schematic, PCB Layout, and Bill of Materials
Figure 7-5. Power Layer PCB Layout
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Figure 7-6. Bottom Layer PCB Layout
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Schematic, PCB Layout, and Bill of Materials
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7.3 Bill of Materials
Table 7-1 lists the ALM2403Q1EVM bill of materials (BOM).
Table 7-1. ALM2403Q1EVM Bill of Materials
Designator
Quantity
Value
Description
!PCB1
1
C3, C7, C15, C17
4
0.15uF
CAP, CERM, 0.15 uF, 50 V, +/- 10%, X7R, 0805
C2, C21
2
5.6pF
C4, C5, C10, C11, C19
5
C22
1
C18
1
D1
1
H1, H2, H3, H4
Package Reference
Part Number
Manufacturer
AMPS086
Any
0805
C0805C154K5RACTU
Kemet
CAP, CERM, 5.6 pF, 50 V, +/- 5%, C0G/NP0, 0805
0805
08055A5R6CAT2A
AVX
0.1uF
CAP, CERM, 0.1 uF, 50 V, +/- 10%, X7R, 0805
0805
08055C104KAT2A
AVX
0.01uF
CAP, CERM, 0.01 uF, 50 V, +/- 10%, X7R, 0805
0805
08055C103KAT2A
AVX
10uF
CAP, CERM, 10 uF, 35 V, +/- 10%, X7R, 1206
1206
'C3216X7R1V106K160AC
TDK
40V
Diode, Schottky, 40 V, 2 A, SMB
SMB
MBRS2040LT3G
ON Semiconductor
4
Machine Screw, Round, #4-40 x 1/4, Nylon, Philips
panhead
Screw
NY PMS 440 0025 PH
B&F Fastener Supply
H5, H6, H7, H8
4
Standoff, Hex, 0.5"L #4-40 Nylon
Standoff
1902C
Keystone
J1, J6
2
Connector, End launch SMA, 50 ohm, SMT
End Launch SMA
142-0701-801
Cinch Connectivity
J3
1
Terminal Block, 3.5mm, 4x1, Tin, TH
Terminal Block, 3.5mm, 4x1, TH
0393570004
Molex
J5, J8
2
Header, 100mil, 3x1, Gold, TH
PBC03SAAN
PBC03SAAN
Sullins Connector Solutions
J7
1
Terminal Block, 3.5mm, 2x1, Tin, TH
Terminal Block, 3.5mm, 2x1, TH
ED555/2DS
On_shore Technology
R3, R17
2
24.9k
RES, 24.9 k, 0.5%, 0.1 W, 0805
0805
RR1220P-2492-D-M
Susumu Co Ltd
R4, R8, R12, R16, R20, R21
6
10.0k
RES, 10.0 k, 0.5%, 0.125 W, 0805
0805
RT0805DRE0710KL
Yageo America
4
0
RES, 0, 5%, 0.125 W, AEC-Q200 Grade 0, 0805
0805
ERJ-6GEY0R00V
Panasonic
SH-J1, SH-J2
2
1x2
Shunt, 100mil, Flash Gold, Black
Closed Top 100mil Shunt
SPC02SYAN
Sullins Connector Solutions
TP1, TP2, TP3, TP4, TP5,
TP6, TP7, TP8, TP9, TP10,
TP11, TP12, TP13, TP14
14
Test Point, Miniature, SMT
Test Point, Miniature, SMT
5019
Keystone
U1
1
24-V, High-Current, Wide-Bandwidth, Dual Operational
Amplifier, PWP0014H (HTSSOP-14)
PWP0014H
ALM2403QPWPRQ1
Texas Instruments
C1, C6, C8, C9, C13, C14,
C16, C20
0
0.01uF
CAP, CERM, 0.01 uF, 50 V, +/- 10%, X7R, 0805
0805
08055C103KAT2A
AVX
C12
0
0.22uF
CAP, CERM, 0.22 uF, 50 V, +/- 5%, X7R, 1206
1206
C1206C224J5RACTU
Kemet
J2, J4
0
Connector, End launch SMA, 50 ohm, SMT
End Launch SMA
142-0701-801
Cinch Connectivity
R1, R5, R7, R10, R13, R15,
R18
0
24.9k
RES, 24.9 k, 0.5%, 0.1 W, 0805
0805
RR1220P-2492-D-M
Susumu Co Ltd
R6, R14
0
10.0k
RES, 10.0 k, 0.5%, 0.125 W, 0805
0805
RT0805DRE0710KL
Yageo America
R2, R9, R11,
R19
14
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Revision History
8 Revision History
Changes from Revision * (February 2020) to Revision A (March 2021)
Page
• Added C2 (5.6 pF) and C21 (5.6 pF) to Figure 2-1, ALM2403Q1EVM Simplified Schematic ........................... 4
• Added C2 (5.6 pF) and C21 (5.6 pF) to Figure 5-1, ALM2403Q1EVM Input and Output Connections .............7
• Changed Figure 7-1, ALM2403Q1EVM Schematic to show C2 (5.6 pF), R2 (0 Ω) C21 (5.6 pF), and R19 (0 Ω)
as populated components...................................................................................................................................8
• Changed BOM table to show C2, C21, R2, and R19 as populated..................................................................14
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