Texas Instruments LM76202-Q1 User manual

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LM76202-Q1 Evaluation Module
User's Guide
SLVUBM3B–January 2019–Revised December 2019
LM76202-Q1 Evaluation Module
This user’s guide describes the evaluation module (EVM) for the Texas instruments LM76202-Q1 and
LM74202-Q1 Ideal diodes. The document provides EVM configuration information and test setup details
for evaluating the LM76202-Q1 or LM74202-Q1 device. The EVM schematic, board layout and bill of
materials (BOM) are also included.
Contents
1 Introduction ................................................................................................................... 2
2 Description.................................................................................................................... 2
3 Schematic..................................................................................................................... 3
4 Connector, Jumper and LED Descriptions ............................................................................... 3
5 Test Equipment and Setup ................................................................................................. 4
6 Test Procedure and Results................................................................................................ 5
7 Board Layout................................................................................................................ 12
8 Bill of Materials ............................................................................................................. 13
9 Evaluating LM74202-Q1 on LM76202-Q1EVM ........................................................................ 14
List of Figures
1 LM76202-Q1EVM Schematic .............................................................................................. 3
2 LM76202-Q1 EVM Setup................................................................................................... 5
3 LM76202-Q1EVM Output Slew Rate with Inrush Current Limiting (VIN = 12.5 V, CdVdT = 12 nF, COUT
= 47 µF, No-load)............................................................................................................ 6
4 LM76202-Q1EVM Current Limit Operation (VIN = 12.5 V, ILIM = 2.23 A, ROUT = 3 Ω, MODE = RTN)........ 7
5 LM76202-Q1EVM Output Hot Short (VIN = 12.5 V, ILIM = 2.23 A, MODE = RTN)................................ 8
6 LM76202-Q1EVM Output Overvoltage Protection (VIN = 36 V, ILIM = 2.23 A, ROUT = 28 Ω, MODE = RTN) 9
7 LM76202-Q1EVM Wake-up Into Short (VIN = 12.5 V, ILIM = 2.23 A, MODE = RTN)............................ 10
8 LM76202-Q1EVM Negative Input Voltage Transient Test (12-V battery voltage, transient voltage = –150
V , RLOAD = 12 Ω)............................................................................................................ 11
9 LM76202-Q1EVM Positive Input Voltage Transient Test (12-V battery voltage, transient voltage = 36 V ,
RLOAD = 14 Ω)................................................................................................................ 12
10 LM76202-Q1EVM Top Assembly ........................................................................................ 12
11 LM76202-Q1EVM Bottom Assembly .................................................................................... 12
12 LM76202-Q1EVM Top Layer ............................................................................................. 12
13 LM76202-Q1EVM Bottom Layer ......................................................................................... 12
List of Tables
1 LM66202-Q1EVM Operating Range and Jumper Settings............................................................. 2
2 Input and Output Connector Description ................................................................................. 3
3 Test Points Description ..................................................................................................... 3
4 Jumper Description.......................................................................................................... 3
5 Default Jumper Setting for LM76202-Q1EVM ........................................................................... 5
6 Bill of Materials ............................................................................................................. 13

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Trademarks
The LM74202-Q1 device is 4.5 V to 40 V, 2.23-A ideal diode with reverse battery protection, overvoltage,
short-circuit and reverse current blocking protection. are trademarks of others.
1 Introduction
The LM76202-Q1EVM allows reference circuit evaluation of TI's LM76202-Q1 and LM74202-Q1 ideal
diodes. The LM76202-Q1 device is 4.5 V to !~5560 V, 2.23-A ideal diode with reverse battery protection,
overvoltage, short-circuit and reverse current blocking protection. The LM74202-Q1 device is 4.5 V to 40
V, 2.23-A ideal diode with reverse battery protection, overvoltage, short-circuit and reverse current
blocking protection.
1.1 EVM Features
LM76202-Q1EVM features include:
• 4.2-V to 60-V Operating voltage (without TVS on Input)
• 4.2-V to 33-V (with 33-V TVS on input for transient protection)
• 0.2 A to 2.23 A programmable current limit using onboard jumpers
• MODE pin configuration using onboard jumpers
• Output overvoltage protection (34 V)
• Load protection from transients: ISO 7637-2 Pulse 1 and ISO 16750-2 Pulse 5b
• UVLO configuration using onboard jumpers
• LED status indication for FLT output and VOUT
1.2 EVM Applications
• Automotive ECU protection
• Camera supply protection
• Telematics
• Industrial transport
2 Description
The LM76202-Q1EVM enables evaluation of LM76202-Q1 and LM74202-Q1 ideal diodes. Table 1
provides the operating range and jumper settings for this EVM. To test this EVM, setup the EVM as per
steps provided in Section 5.5. Test procedure and results for this EVM are provided in Section 6. To
configure the EVM for another configuration (non-default), see Table 4. To probe different signals on this
EVM, see Table 3. Equipments required to test this EVM are listed in Section 5. To connect power supply
and load to this EVM, see Section 4.1.
Table 1. LM66202-Q1EVM Operating Range and Jumper Settings
Part Number EVM
Function VIN Range (T1) VIN UVLO (J2, J6) Output Overvoltage
ILIM Pin
Configuration
(J5)
MODE Configuration
(J4)
LM76202-Q1EVM 4.2 V to 60 V, 2.23 A Ideal
Diode
4.2 V to 60 V
4.2 V to 33 V
(with 33-
VTVS)
4 V
6 V (With R2,
R5) 34 V 0.2 A to 2.23 A
• Current Limit with
Auto-Retry (Default)
• Current Limit with
Latch-Off
• Current Limit with
Latch-Off
• Circuit breaker with
Auto-Retry

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3 Schematic
Figure 1 provides the schematic for LM76202-Q1EVM.
Do not use R9 between OVP and GND. For Programmable OV clamp, see Overvoltage Protection in the LM76202-
Q1 datasheet.
Figure 1. LM76202-Q1EVM Schematic
4 Connector, Jumper and LED Descriptions
4.1 Input and Output Connector Description
Table 2. Input and Output Connector Description
Connector Label Description
T1 VIN1 Power input connector for connecting power supply.
T2 VOUT1 Power output connector for connecting load.
4.1.1 Test Points Description
Table 3. Test Points Description
Test Points Label Description
TP1 FLT FLT Signal output
TP2 VIN1 Positive voltage input
TP3 VOUT1 Positive voltage output
TP6 RTN1 RTN signal
TP7 GND Input ground signal
TP8 GND Output ground signal
Table 4. Jumper Description
Jumper Label Description
J1 Pull-up for FLT This jumper is used for pulling up FLT to VOUT.
OPEN: For pulling-up FLT with any other voltage (like VIN), Open this jumper and connect
Pin 2 of J1 externally to the desired voltage (< 60 V).
CLOSED: FLT is pulled-up from VOUT.
J2 UVLO Selection This jumper is used for selecting UVLO input 1-2: UVLO configured through R2 and R5 resistors. Close Jumper J6 with this configuration.
2-3: UVLO set to 4-V (POR). Open Jumper J6 with this configuration.
J3 VOUT Indication Close this jumper for powering D4(Green) LED from VOUT

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Table 4. Jumper Description (continued)
Jumper Label Description
J4 MODE
Configuration
This jumper configures the device mode for overcurrent and over-load conditions.
OPEN: Circuit breaker mode with auto-retry (MODE = Open)
1-2: Current limit with auto-retry (MODE = RTN, Default)
2-3: Current limit with latch-off. (402-kΩresistor connected MODE and RTN)
J5 ILIM
Configuration
This jumper sets the overcurrent limit.
1-2: ILIM = 2.23 A
3-4: ILIM = 1.5 A
5-6:ILIM = 1 A
7-8: ILIM = 0.2 A
J6 UVLO
Configuration This jumper configures the input voltage level for UVLO.
OPEN: R2 and R5 resistor are not used for setting UVLO.
CLOSED: R2 and R5 resistor are used for setting UVLO
5 Test Equipment and Setup
5.1 Power Supplies
One adjustable power supply 0-V to 60-V output, 0-A to 10-A output current limit. UCS 200N and LD 200N
for generating transient voltages as per ISO 7637-2 and ISO 16750-2 specifications
5.2 Meters
One DMM needed
5.3 Oscilloscope
A DPO2024 or equivalent, three 10x voltage probes, and a DC current probe
5.4 Loads
One resistive load or equivalent which can tolerate up to 10-A DC load at 60 V and capable of the output
short.
5.5 Test Setup
Before performing any of the test listed in Section 6, setup the EVM as per steps below:
• Make sure that jumper settings on EVM are set to default position as shown in Table 5
• Connect the power supply, load, oscilloscope and voltmeter to the EVM as shown in Figure 2
• Set the power supply output to zero volts.
• Turn ON the power supply and set the power supply output to 12.5 V and current limit to 10 A.
• Turn OFF the power supply

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Table 5. Default Jumper Setting for LM76202-Q1EVM
Jumper J1 J2 J3 J4 J5 J6
Position Closed Closed between
Pin 2 and 3 Closed Closed between Pin 1 and 2 Closed
between Pin 1
and 2 Open
Description D1 (RED) Is powered from
VOUT UVLO = 4 V D4 (Green) Is
powered from
VOUT
Current limit with
auto-retry (MODE
= RTN) ILIM = 2.23 A UVLO is not set from R2 and
R5 resistors.
Figure 2. LM76202-Q1 EVM Setup
6 Test Procedure and Results
6.1 Hot-Plug Test
Use the following instructions to measure the output slew rate and input inrush current during Hot-Plug
event.
• Set the input supply voltage VIN to 12.5 V and current limit of 10 A. Enable the power supply.
• Hot-plug the supply at input connector T1.
• Observe the waveform at VIN, VOUT, FLT and IIN with an oscilloscope to measure the output slew
rate and rise time .
Figure 3 shows an example of inrush current captured on the LM76202-Q1EVM.

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Figure 3. LM76202-Q1EVM Output Slew Rate with Inrush Current Limiting (VIN = 12.5 V, CdVdT = 12 nF,
COUT = 47 µF, No-load)
6.2 Current Limit Test
Use the following instructions to perform current limit test.
• Set the input supply voltage VIN to 12.5 V and current limit of 10 A and enable the power supply.
• Connect the power supply on connector T1 of the EVM.
• By default, the EVM is configured for 2.23 A current limit.
• Connect a load of 3 Ω(20 W) at connector T2 of the EVM.
• The device limits the current to 2.23 A, turns off the internal MOSFET after reaching the thermal
shutdown temperature (TSD) and auto-retries after a time of tretry (512 ms)
Figure 4 shows an example of current limit at 2.23 A on the LM76202-Q1EVM

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Figure 4. LM76202-Q1EVM Current Limit Operation (VIN = 12.5 V, ILIM = 2.23 A, ROUT = 3 Ω, MODE =
RTN)
6.3 Output Hot-Short Test
Use the following instructions to perform output Hot-Short test
• Set the input supply voltage VIN to 12.5 V and current limit of 10 A and enable the power supply.
• Short the output of the device on connector T2, VOUT to GND with a short and thick wire (5cm long
and 4 sq. mm thick).
• Observe the waveforms of VIN, VOUT, FLT and IIN using an oscilloscope.
Figure 5 shows an example of output hot short on the LM76202-Q1EVM. FLT is pulled-up from VIN for
this test.

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Figure 5. LM76202-Q1EVM Output Hot Short (VIN = 12.5 V, ILIM = 2.23 A, MODE = RTN)
6.4 Overvoltage Cut-off Protection Test
Use the following instructions to perform output overvoltage protection test
• Set the input supply voltage VIN to 36 V and current limit of 10 A and enable the power supply.
• Connect a load of 28 Ω(30 W) at connector T2 of the EVM.
• Observe the waveforms of VIN, VOUT, FLT and IOUT using an oscilloscope.
Figure 6 shows an example of overvoltage cutoff protection on the LM76202-Q1EVM. FLT is pulled-up
from VIN for this test.

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Figure 6. LM76202-Q1EVM Output Overvoltage Protection (VIN = 36 V, ILIM = 2.23 A, ROUT = 28 Ω, MODE
= RTN)
6.5 Wake-up Into Short Test
Use the following instructions to perform Wake-up into Short test
• Set the input supply voltage VIN to 12.5 V and current limit of 10 A and enable the power supply.
• Short the output of the device on connector T2, VOUT to GND with a short and thick wire (5cm long
and 4 sq. mm thick).
• Observe the waveforms of VIN, VOUT, FLT and IIN using an oscilloscope.
Figure 7 shows an example of Wake-up into Short on the LM76202-Q1EVM. FLT is pulled-up from VOUT
for this test.

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Figure 7. LM76202-Q1EVM Wake-up Into Short (VIN = 12.5 V, ILIM = 2.23 A, MODE = RTN)
6.6 Negative Input Voltage Transient Test (ISO 7637-2 Pulse 1)
Use the following instructions to perform negative input voltage transient test
• Select the ISO 7637-2 Pulse 1 in UCS 200N simulator.
• Set the parameters for pulse as:
– Battery voltage = 12 V
– Us= –150 V
– Ri= 10 Ω
– tr= 1 µs
– t1= 0.5 s
– t2= 200 ms
• Connect the output of UCS 200N to input connector T1 of the EVM.
• Connect a load of 12 Ωon the output connector T2 of the EVM.
• Enable the output of UCS 200N and start the test.
• Observe the waveforms of VIN, VOUT and IOUT using an oscilloscope.
Figure 8 shows the protection of load during a negative input voltage transient of –150 V (with
specifications as per ISO 7637-2 pulse 1). The TVS diode D2 clamps the input voltage to –40 V during the
transient event.