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MOSFET(Metal Oxide Semiconductor Field Effect Transistor) is a FET used for switching or amplifying signals

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Alex thomas
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Alex thomas
Asked: December 20, 2022In:
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Hello, I have a problem with the L6498D driver, the high- side doesn’t work designed a driver for a full h- bridge using two L6498D when I activate the LIN input the LVG output is activated and manages to turn ...Read more

Hello, I have a problem with the L6498D driver, the high- side doesn’t work designed a driver for a full h- bridge using two L6498D when I activate the LIN input the LVG output is activated and manages to turn on the low side MOSFET, but when I activate the HIN input I get a strange output of9.6 v on HVG and I’m using 12v at VCC of the L6498D. This strange voltage position always appears, when I always keep the HIN input high or when there’s a PWM in HIN, in both situations the HVG output is always the same,9.6 v.

What could be happening?

 

Thank You

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  1. vikas Nagpal

    Hi, In order to work properly, the bootstrap structure requires LIN to be active, and consequently, the OUT/S1 pin is connected to GND for the time needed to pre-charge the bootstrap capacitor. With an external bootstrap diode, alternately, the circuit topology/load should allow the OUT/S1 pin to goRead more

    Hi,

    In order to work properly, the bootstrap structure requires LIN to be active, and consequently, the OUT/S1 pin is connected to GND for the time needed to pre-charge the bootstrap capacitor.

    With an external bootstrap diode, alternately, the circuit topology/load should allow the OUT/S1 pin to go at GND level (or lower) from time to time in order to achieve the same result.
    Every time HIN is activated, there should be a residual charge/voltage in the bootstrap capacitor which is more advanced than the UVLO turn-on threshold (maximum).

    I hope this answer helps,
    Regards

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