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LM74700-Q1: What is VGATE voltage? Does it have immunity against ANODE voltage transient?

Part Number: LM74700-Q1

Hi team, 

What is VGATE voltage? I guess it is as same voltage as ANODE-VCAP voltage, is it correct?

In addition, in the case voltage transient of ANODE pin occur, then is ANODE-VCAP voltage within 15V?
Its datasheet says ANODE recommended voltage is -60V ~ 60V but GATE-ANODE voltage rating says 15V. Is there an internal zener diode between ANODE-VCAP?


  • Hi Ochi,

    I will check with the designer and get back by this weekend. 

    Thanks, Rakesh 

  • Hi Ochi,

    In our test waveforms VGATE voltage refers to the voltage of GATE pin with reference to ground. 

    The FET Vgs = GATE - Anode. In full conduction mode of operation, GATE is connected to VCAP. So, Vgs = V(VCAP) – V(ANODE)

    The internal charge pump regulates the voltage to max 15V. 

    Thanks, Rakesh