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TPS7B7702-Q1: The device is broken when doing the short circuit test

Sherry Liang
Genius 10255 points
Part Number: TPS7B7702-Q1

Dear team,

Today my customer did the short circuit, but the device is broken. Then the customer measured the resistance between each pin and ground,  and finally found that the output pin is shorted to ground. 

Their short circuit test operation is as follows(this test method is required by the OEM)，

Except for the ground and output pins, all pins are properly connected. The GND pin is disconnected with the ground, and then the output pin is connected to the GND pin. They tested 3 devices, and all are broken. Could you please help analyze this phenomenon?

And my customer thinks maybe this is related to the diode as below, and they wants to ask for the specs of this diode(Maximum Repetitive Peak Reverse Voltage, Peak Forward Voltage, Average Output Rectitifed Current, Peak One Cycle Surge Forward Current, Volt-ampere characteristic curve). Could you please provide these information?

In addition, the schematic and layout is as below,

Thanks & Best Regards,

Sherry

  • 0
    TI__Mastermind 23361 points

    Hi Sherry, 

    First, will you help to clarify which diode you were referring to? The only diodes currently in the schematic are D1609 and D1610 and they are external diodes. 

    I also have some questions regarding the method of how the short circuit tests were conducted by the OEM. 

    1. As you mentioned, this method is required by the OEM. Normally for short-circuit tests on automotive devices, the standard is to use the AEC-Q100-012 method. I am trying to understand what is the usage case for them to lift grounds. 

    2. Can you provide more details on what the short-circuit is doing after the ground being lifted? 

    Regards, 
    Jason Song