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Bootstrap Amplifier Circuit using Transistors
https://circuitdigest.com/electronic-circuits/bootstrap-amplifier-circuit-using-transistors
Bootstrap capacitor is used to provide AC signal’s positive feedback to the base of the transistor. This positive feedback help in improving the effective value of the base resistance. This increment in the base resistance also determined by the voltage gain of the amplifier circuit. Why do we need High Input Impedance for Amplifier Transistor?
TPA31xxDx Bootstrap Circuit Application Report
https://www.ti.com/lit/an/sloa259/sloa259.pdf
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.
Passive Component Selection Guide for Class-D …
https://www.ti.com/lit/pdf/slaa903
Bootstrap capacitor The bootstrap capacitor needs to be connected between the bootstrap pin and respective Class-D output pin. Applicable for non-boosted audio amplifiers. Charge pump capacitor Connect on high-side gate CP regulator output with respect to power stage supply. Applicable for boosted audio amplifiers. Boost inductor
Class D Amplifier Design Basics II - irf.com
http://www.irf.com/product-info/audio/classdtutorial2.pdf
charging bootstrap capacitor C BS with current I 3 from V CC. • Note that V BS = V CC – (forward drop voltage of D BS). •I 4 turns off the low-side MOSFET. Then, I 5 turns on the high-side MOSFET, lifting VS up to +B. As long as the high side is ON, bootstrap diode D BS isolates the floating power supply VBS and bootstrap capacitor C BS ...
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