Bootstrap mosfet gate driver

gate driver IC is the bootstrap power supply. The bootstrap power supply consists of a bootstrap diode and a bootstrap capacitor; this circuit is illustrated in Figure 1. The bootstrap circuit is useful in a high−voltage gate driver and operates as follows. When the VS goes below the IC supply voltage VDD or is pulled down to ground (the low −side switch is turned on and the highside switch is turned of f), the bootstrap capacitor, CBOOT, charges through the bootstrap resistor, RBOOT, and bootstrap diode, DBOOT.  · Gate Driver A MOSFET driver IC translates TTL or CMOS logical signals, to a higher voltage and higher current, with the goal of rapidly Missing: bootstrap.

Gate Driver A MOSFET driver IC translates TTL or CMOS logical signals, to a higher voltage and higher current, with the goal of rapidly and completely switching the gate of a MOSFET. The bootstrap circuit is useful in a high−voltage gate driver and operates as follows. When the VS goes below the IC supply voltage VDD or is pulled down to ground (the low −side switch is turned on and the highside switch is turned of f), the bootstrap capacitor, CBOOT, charges through the bootstrap resistor, RBOOT, and bootstrap diode, DBOOT. You must drive the MOSFET between its gate and source terminals. Since the source terminal voltage of a high side MOSFET will be floating, you need a separate voltage supply (VBS: \$V_\text{Boot Strap}\$) for the gate drive circuit. In the schematic below, VCC is the voltage source of the rest of the circuit.

A bootstrap circuit is used for the gate drive of the high-side (upper-leg) devices of a bridge circuit. Generally, the gate of N-channel MOSFETs or IGBTs. 01/04/ For devices that works with a bootstrap approach, meaning the high side gate drive voltage which should be larger than supply voltage in the N-. 1. BOOT. Bootstrap Supply for High Side Gate Driver. 2. PWM. PWM Signal Input. Connect this pin to the PWM output of the controller. 3. NC.