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TPSI3050: TPSI3050s

Alok Ranjan
Prodigy 10 points
Part Number: TPSI3050

Hello ,

I'm utilizing the TPSI3050S to drive a MOSFET in a three-wire configuration. An IR detector is employed for the enable logic, which by default is active, holding the enable pin low. When the light is obstructed, the enable pin receives 4.66V.

On the driver's secondary side, there's a 10V power supply generating , and an RPXFR with a 20Kohm resistor is also in use.

However, the MOSFET's driving pin, VDRV, remains persistently low and does not switch to high.

I need assistance in determining the underlying cause of this issue.

Below is the attached schematic.

For my application, I've chosen an N-channel 200V 130A MOSFET, with the part number IRFP4668PBF from Infineon.

  • 0
    TI__Expert 7356 points

    Hello Alok,

     Thanks for joining E2E and reaching out to our team! S-variant is our one-shot device, which sends a 2.5 us pulse on VDRV whenever EN goes high. I’m guessing the MOSFET is turning on for 2.5 us. Swap out the TPSI3050S for a TPSI3050. Also, noticed your CDIVx capacitors are mismatching, is there a reason why you have 2.2 uF and 10 uF? Would normally recommend these to match, both being 2.2 uF would be sufficient.

    Best regards,
    Tilden Chen

    Solid State Relays | Applications Engineer