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

  • Dear Sir 

                 Thanks for your reply , I had understood the point no. 1 suggested by you also these was in my mind ,But sir rest all points you had suggested could you elaborate it so i could understood concept and importance behind all of them and I could implement in my circuit to solve my issue and we could conclude with success full run of our circuit.

    Warm Regards

    Sujay

  • 0
    •  Analog Employees 
    on Mar 30, 2018 7:54 PM

    Hi

    I have added explanation to the recommendations that I made in previous post.  See below.

    2. Add catch diode close to TS pin to GND.  See explanation below.

    3. D5, use BAS116.  See explanation below.

    4. C28, Use 1uF, 50V ceramic capacitor.  Capacitor C28 is used to charge C6 via diode D5.  Therefore, the capacitor value at C28 should be larger than the value at C6 by at least 5 to 10 times.  The recommended value is about 5 times higher than the value at C6.

  • 0
    •  Analog Employees 
    on Aug 2, 2018 4:03 PM
    This question has been assumed as answered either offline via email or with a multi-part answer. This question has now been closed out. If you have an inquiry related to this topic please post a new question in the applicable product forum.

    Thank you,
    EZ Admin
  • Hi

    My suggestion would be to monitor VCC pin to GND and BST pin to TS pin with a 10 MEG input impedance digital multimeter.  Typical BST to TS voltage should be around 12V.

    The LTC7004 should work as long as BST pin to TS pin voltage is maintained at around 12V.  If not, check for leakage current from BST pin to other nodes in the circuit.  Check and clear solder flux residue around the circuit.

    I would recommend putting a Schottky diode close to TS pin to GND especially the load includes long length cable. mobdro app


  • I was testing the MOSFET driver LTC7004 and tried to supply power to VCC and GND from an Arduino Mega with a PWM signal. The schematic resembles a Bootstrap circuit. I connected an LED between pins connected to Gate and Source but the LED doesn't blink. Can I really drive an LED with a MOSFET driver krogerfeedback survey?