Contents
How does bootstrap capacitor work?
A bootstrap capacitor is connected from the supply rail (V+) to the output voltage. When the low-side N-FET is on, current from the power rail (V+) flows through the bootstrap diode and charges the bootstrap capacitor through that low-side N-FET.
What is bootstrap supply voltage?
The maximum voltage across the bootstrap capacitor under normal operating conditions is VREG max. However, in some circumstances, the voltage may transiently reach a maximum of 18 V, which is the clamp voltage of the Zener diode between the C terminal and the S terminal.
How does bootstrap Mosfet work?
Simple in structure, a bootstrap circuit is a step-up charge pump composed of a switch, a capacitor, and a diode, where a voltage equal to the switch voltage (Vin) plus the internal supply voltage is used as the gate drive for the high-side Nch MOSFET.
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Why does a bootstrap capacitor need to be used?
First, the bootstrap capacitor is used because the voltage on the high side drivers gate need to be about 10-15 volts higher than the voltage on its drain. However , if my input supply is about 20 V and the gate voltage is not higher than the source voltage as well. Is it possible to turn on?
How is bootstarp capacitor used in switch mode?
This bootstarp capacitor, allows to keep the high side MOSFET gate voltage greater than the input voltage. As you can see in the figure 1 from the datasheet, a diode is connected to the BS pin allowing to charge the boost capacitor when the SW is low.
What is the bootstrap gate drive circuit used for?
Bootstrap gate drive circuits are used with H-bridge and half-bridge MOSFET topologies. The overall idea of the bootstrap gate drive circuits is this: Initial conditions: Q1 is turned off. Q2 is turned on. The Gate of Q2 is at V cc.
Is the bootstrap circuit a low cost solution?
4 Conclusion The bootstrap circuit is a very simple and low-cost solution for high-side MOSFET control on class-D audio amplifiers. Overdischarging on the bootstrap capacitors can occur in very extreme test cases. Using lower-frequency PWM settings (for example, 400 kHz) or a larger bootstrap capacitor (for example, 0.47 µF) can avoid this issue.