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TPS4H160-Q1: TPS4H160-Q1

Rahul Kumar
Prodigy 20 points
Part Number: TPS4H160-Q1

Hi,

I am using the TPS4H160BQPWPRQ1. If One channel output is shorted to VBAT (VBAT > VIn) and If all the channels are enabled, whether short to VBAT of one channel will affect the other enabled channels ?

I'm having 2 options for that :

1) In my design I have provided the clamped diode in Current Sense PIN which can clamp any voltage above than 1.8 V. So, If the above condition is true then shall I use the design with clamped diode to avoid the short to          VBAT failure on all channels ?

2) Or if I use 4 Schottky diode on each output channels will protect the short to VBAT failure on all channels. 

I want to know, which option will be better option for me, or Please suggest me if you have any option for this condition.

I have attached the schematic for reference.

 

                   

Thanks

  • 0
    TI__Mastermind 32650 points

    Hi Rahul,

    I assume by VIN you mean VS. Therefore the output voltage will be larger than VS and the condition is a reverse current condition. The device has no inbuilt protection for reverse current events. I would recommend wither using a single diode on the VS pin to stop the flow of current from VOUT back to VS or diodes on the output of every channel as you have mentioned in point 2.

    Thanks,

    Shreyas

  • 0 in reply to Shreyas Dmello
    Prodigy 20 points

    Hi Shreyas,

    Thanks for quick response

    So, As you mention single Diode on the VS Pin can protect the reverse current but If VBAT > VS and with enabled condition, output shorted to VBAT then through the body diode reverse current can impact other channels. 

    So, Will single diode on VS protect the above condition ?

    If above condition will satisfy then we can replace 4 series diodes on each channel with single diode on VS.

    Thanks 

    Rahul Kumar

  • +1 in reply to Rahul Kumar
    TI__Mastermind 32650 points

    Hi Rahul,

    A diode on the input will protect any current from flowing back into the supply voltage. Even in the case of reverse polarity, there is no path from GND to the supply with the upstream diode. It will not stop conduction to the other channels. There fore there can exist path that goes from OUT to VS through the body diode, then through to the other channel loads through the enabled channels. It is possible to recognize the short to BAT fault through software and then turn off all the other channels.

    If the channel is on and the SNS current is 0 when the expectation is high sense current, then it is a short to bat fault. The MCU can then disable all other channels which will protect the other channel loads.

    Thanks,

    Shreyas