What is the difference between high side driver & low side drivers..??

[deepakchikane]

Can anyone tell me diff between high side driver & low side driver..??

 

[Venkadesh_M]

A low side driver means driving the lower side MOSFET of a Hbridge, switching between 0 to 15 V is enough..
but the upper mosfet cant be driven with ordinary 15V from Gnd because its source terminal is doesnt connected with the GND. so it needs a floating drive(which gives the 15V between the source and Gate).

 

[Fidelis Anyanti]

Re: What is the difference between high side driver & low side drivers..??

Moreover, to deliver the voltage that fires the gate of the high side fet, you normally will have to use a bootstrap capacitor to trap enough voltage and use it to fire between the gate and source of the high side fet.

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[deepakchikane]

Re: What is the difference between high side driver & low side drivers..??

Moreover, to deliver the voltage that fires the gate of the high side fet, you normally will have to use a bootstrap capacitor to trap enough voltage and use it to fire between the gate and source of the high side fet.

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Moreover, to deliver the voltage that fires the gate of the high side fet, you normally will have to use a bootstrap capacitor to trap enough voltage and use it to fire between the gate and source of the high side fet.

what is bootstrap..??
how it can be designed..??

 

[Venkadesh_M]

IR2110 is a bootstrap driver, it charges the capacitor when lower mosfet ON and use it when higher side is to be turned ON....
refer this document,

 

[Fidelis Anyanti]

Yes that is right, however, just to be specific, This is bootstrap Capacitor :