Problem regarding Mosfet Driver IC LTC7004

Dear Sir /Mam

                         There is one issue regarding LTC Mosfet driver IC 7004. IC is working fine with input from SMPS of about 28 Volts 8 amps , But as soon as we connect Battery input of about 24 Volts , IC gets damged , I am using IC7004 as high side application driver in my application to switch 28 volts from smps or battery output of about 24 Volts. Also I am not violating the pin voltage rating of INP and VCC of the IC both are in safe margin of about 7 Volts and 12 Volts Respectively. Also I had checked the current rating of INP pin when driver IC is on it is about 11 ampere. Reply as early as possible If required I could also share the circuit schematic.

Warm Regards

Sujay Kulkarni

Parents
  • 0
    •  Analog Employees 
    on Mar 23, 2018 8:48 PM

    Hi

    I think this design needs input and output high voltage transient protection when the user connect this circuit to the battery manually.

    I added my recommendations to the schematic.  See below for a list of recommendations and schematic.

    1. Add TVS at input and output close to LTC7004.

    2. Add catch diode close to TS pin to GND.

    3. D5, use BAS116.

    4. C28, Use 1uF, 50V ceramic capacitor.

Reply
  • 0
    •  Analog Employees 
    on Mar 23, 2018 8:48 PM

    Hi

    I think this design needs input and output high voltage transient protection when the user connect this circuit to the battery manually.

    I added my recommendations to the schematic.  See below for a list of recommendations and schematic.

    1. Add TVS at input and output close to LTC7004.

    2. Add catch diode close to TS pin to GND.

    3. D5, use BAS116.

    4. C28, Use 1uF, 50V ceramic capacitor.

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