Texas Instruments LM74930Q1EVM User manual

EVM User's Guide: LM74930Q1EVM LM74930-Q1
LM74930-Q1 Evaluation Module for Ideal Diode Controller
Description
The LM74930-Q1 Evaluation Module
(LM74930Q1EVM) helps designers evaluate the
operation and performance of the LM74930-Q1 ideal
diode controller with power path ON/OFF control,
overcurrent, short-circuit and overvoltage protection.
The wide input supply of LM74930-Q1, 4V to 65V,
allows protection and control of 12-V and 24-V
automotive battery powered ECUs. The LM74930-
Q1 can drive back-to-back external N-Channel
MOSFETs connected in common source topology
to realize surge stopper functionality. With first
MOSFET in the power path, the device allows load
disconnect (ON/OFF control) in case of overcurrent
and surge/overvoltage events using HGATE control.
An integrated ideal diode controller (DGATE) drives
the second MOSFET to replace a Schottky diode for
reverse input protection and output voltage holdup.
Features
• Reverse current blocking feature required for
ORing application
• Input reverse battery protection
• Drives external back-to-back N-Channel MOSFETs
in common source configuration
• Surge protection against transients like 200 V
unsuppressed load dump
• Adjustable overcurrent and short circuit protection
• Analog current monitor output with 10% accuracy
(IMON)
• Adjustable overvoltage and undervoltage
• MODE pin to allow bi-directional current flow
(MODE = Low)
Applications
• 12 V/24 V automotive reverse battery protection
•Industrial transport
• Redundant power supply ORing
LM74930Q1EVM
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1 Evaluation Module Overview
1.1 Introduction
This user’s guide describes the LM74930Q1EVM evaluation module for evaluating the performance of the
LM74930-Q1 ideal diode controller devices. The LM74930-Q1 ideal diode controller drives and controls external
back to back N-Channel MOSFETs to emulate an ideal diode rectifier with power path ON/OFF control, as well
as overcurrent, short-circuit, and overvoltage protection. This document provides EVM configuration information
and test setup details for evaluating the LM74930-Q1 device. The EVM schematic, board layout, and bill of
materials (BOM) are also included.
Table 1-1. LM74930Q1EVM Evaluation Board Options and Setting
Part Number EVM Function Vin Range Vin UVLO Vin OVP ENABLE
(EN)
Overcurrent
Protection Features
Low
Setting
Hi
Setting
LM74930Q1EVM
Ideal diode with
surge stopper
functionality,
circuit breaker,
under and
overvoltage
protection with
fault output
4 V to 65 V 5.3 V 36.96 V Active high 4 A 6 A
Selectable
overcurrent
threshold and timer
setting
1.2 Kit Contents
Table 1-2. LM74930Q1EVM Kit Contents
Item Description Quantity
LM74930Q1EVM PCB 1
1.3 Specification
• 4-V to 65-V input range
• 4-A and 6-A adjustable overcurrent protection using on-board jumpers
• Programmable circuit breaker timer
• Load current monitoring output
• Programmable auto-retry and latch options
• LED for fault indication
• LED indication for output ON/OFF detection
1.4 Device Information
LM74930-Q1 is an ideal diode with surge stopper, circuit breaker, overvoltage protection and fault output. The
LM74930-Q1 ideal diode controller drives and controls external back to back N-Channel MOSFETs to emulate
an ideal diode rectifier with power path ON/OFF control with overcurrent and overvoltage protection. The wide
input supply of 3 V to 65 V allows protection and control of 12-V and 24-V automotive battery powered ECUs.
The device can withstand and protect the loads from negative supply voltages down to –65 V.
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2 Hardware
2.1 Test Points and Connectors
Table 2-1 lists the LM74930Q1EVM evaluation board input and output connector functionality. Table 2-2 and
Table 2-3 describe the test point availability and the jumper functionality.
Table 2-1. Input and Output Connector Functionality
Connector Label Description
J1 VIN Power input connector to the positive rail of the input power supply.
J3 PGND Ground connection for the power supply.
J2 VOUT Power output connector to the positive side of the load.
J9 VOUT_LC Power output connector after the output CLC Filter.
J4 PGND Ground connection for the load.
Table 2-2. Test Points Description
Test Points Label Description
TP1 VIN Input power supply to the EVM.
TP2 VOUT Output from the EVM.
TP3, TP4, TP14 PGND EVM ground.
TP5 EN Enable input.
TP6 VS Input power supply to the IC.
TP7 DGATE Diode controller gate drive output.
TP8 HGATE GATE driver output for the HSFET.
TP9 FLT/ Active low open drain fault output.
TP10 MODE MODE input to disable reverse current blocking function of DGATE.
TP11 TMR Fault timer input.
TP12 IMON Analog current monitor output.
TP13 C Cathode of the ideal diode.
TP15 VREG Onboard regulated voltage supply
Table 2-3. Jumper and LED Descriptions
Jumper Connection Description
J5 1-2 EN connected to VREG. EN pulled High.
2-3 EN connected to GND. EN pulled Low.
J6 1-2 MODE connected to VREG.
2-3 MODE connected to GND. RCB disabled.
J7 1-2 Output high D5 LED indication.
J8
1-2 OVCLAMP connected to OV for overvoltage clamp with timer functionality.
2-3 OVCLAMP connected to GND when OV clamp not needed.
J10
1-2 TIMER duration set to 0.14ms.
3-4 TIMER duration set to 0.68ms,
5-6 Controller set in latch-off mode,
J11
1-2 Overcurrent protection disabled.
3-4 Overcurrent protection threshold set to 4A.
5-6 Overcurrent protection threshold set to 6A.
J12 1-2 IMON voltage set to 0.65V/A.
3-4 IMON voltage set to 0.43V/A.
J13
1-2 Pulls FLT/ pin to external supply
2-3 Pulls FLT/ pin to onboard VREG supply.
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Table 2-3. Jumper and LED Descriptions (continued)
Jumper Connection Description
J14
1-2 Pulls OV resistor divider to VIN
2-3 Pulls OV resistor divider to VOUT
2.2 Test Equipment and Setup
2.2.1 Power Supplies
One adjustable power supply with 0-V to 60-V output and 0-A to 10-A output current limit.
2.2.2 Meters
One DMM minimum needed.
2.2.3 Oscilloscope
A DPO2024 or equivalent, 3 × 10 voltage probes, and a DC current probe.
2.2.4 Loads
One resistive load or equivalent that can tolerate up to 50-A DC load at 60 V and capable of the output short.
2.3 Test Setup and Procedures
Make sure the evaluation board has default jumper settings as shown in Table 2-4.
Table 2-4. Default Jumper Setting for LM74930Q1EVM Evaluation Board
Jumper Default Setting Functionality
J5 1-2 EN connected to VREG. EN pulled High.
J6 1-2 MODE connected to VREG.
Reverse current blocking enabled.
J7 1-2 D5 LED indication when output High.
J8 2-3 OVCLAMP connected to GND.
OVCLAMP functionality disabled.
J10 1-2 TIMER set to 0.14 ms.
J11 3-4 Overcurrent protection threshold set to 4 A.
J12 1-2 IMON voltage set to 0.65 V/A.
J13 2-3 FLT/ pulled up to VREG.
J14 1-2 OV resistor ladder pulled to VIN.
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Figure 2-1. LM74930Q1EVM Setup With Test Equipment
Use the following instructions before starting any test and repeat again before moving to next test.
1. Set the power supply output VIN to 0 V.
2. Turn ON the power supply and set the power supply output VIN to 12 V and current limit of 10 A.
3. Turn OFF the power supply.
4. Set the jumper setting on EVM to default position as shown in Table 2-4.
2.3.1 Power-up and Power-down with Input Voltage
Use the following instructions to capture the precharging current profile.
1. Set the input supply voltage VIN to 12 V and current limit of 10 A.
2. Verify that the J5 jumper setting is set to 1-2.
3. Turn ON the input power supply.
4. Observe the start-up profile of charge pump voltage VCAP , HGATE, DGATE and output voltage.
5. Turn OFF the input power supply.
6. Observe the shutdown profile of charge pump voltage (VCAP – VVS), output voltage, HGATE, and DGATE.
Figure 2-2 shows an example of power-up with EN profile captured on the LM74930Q1EVM evaluation board.
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Figure 2-2. LM74930-Q1 Start-Up With VIN - HGATE, DGATE and VOUT
Figure 2-3. LM74930-Q1 Start-Up With VIN - VS, CAP and HGATE
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2.3.2 Unsuppressed Load Dump 200 V - Output Clamp
Use the following instructions to verify the overvoltage protection feature of LM74930-Q1.
1. To test 200 V Unsuppressed Load Dump, the LD200N or similar equipment is needed as the input power
supply.
2. Make sure the J8 jumper setting is set to 2-3.
3. Set the input supply voltage VIN to 24 V and current limit of 5 A.
4. Turn ON the power supply and observe start-up of output voltage.
5. Now apply 200 V Unsuppressed Load Dump using LD200N equipment.
6. Observe OVCLAMP operation of LM74930-Q1 when input voltage is above OV threshold.
Figure 2-4. Unsuppressed Load Dump 200 V - Output Clamp (OVCLAMP = GND)
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2.3.3 Overcurrent Protection Test
Use the following instructions to perform the overcurrent test on the LM74930Q1EVM.
1. Set the input supply voltage VIN to 12 V and current limit of 10 A.
2. Turn ON the power supply and observe start-up of output voltage, HGATE, and DGATE.
3. By default the EVM is configured for 4-A overcurrent protection.
4. Apply 4-A load at the output with rheostat or electronic load and gradually increase the load current to 6 A.
5. Observe the overload behavior of LM74930-Q1.
Figure 2-5 and Figure 2-6 show test waveforms for an overcurrent fault.
Figure 2-5. Overcurrent Response of LM74930-Q1 for a Load Step From 3.8 A to 6 A With 4-A
Overcurrent Protection Setting
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Figure 2-6. Auto-Retry Response of LM74930-Q1 for an Overcurrent Fault
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2.3.4 Output Hot-Short Test
Use the following instructions to perform output the hot-short test.
1. Set the input supply voltage VIN to 12 V and current limit of 10 A.
2. Turn ON the power supply and observe start-up of output voltage, HGATE, and DGATE.
3. Short the output to GND. That is, VOUT to GND with a cable and observe the short-circuit response of
LM74930-Q1 using an oscilloscope.
Figure 2-7 shows hot-short response of LM74930-Q1 on LM74930Q1EVM evaluation board.
Figure 2-7. Output Hot-Short Response of LM74930-Q1 Device
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