Invention Grant
US08258852B2 Bootstrapped high-side driver control without static DC current for driving a motor bridge circuit 有权
引导式高边驱动器控制,无静态直流电流,用于驱动电机桥电路

Bootstrapped high-side driver control without static DC current for driving a motor bridge circuit
Abstract:
A motor driver circuit for driving the gate node of a high-side driver transistor to a boosted voltage from a charge pump draws little or no static current from the charge pump. The gate node is pulled to the boosted voltage by a p-channel pullup-control transistor that is driven by p-channel transistors that are pumped by capacitors that cut off current flow to ground from the charge pump. An n-channel output-shorting transistor shorts the gate node to the output when the high-side driver is turned off. A coupling capacitor initializes the shorting transistor for each output transition. A p-channel output-sensing transistor generates a feedback to a second stage that drives the coupling capacitor. P-channel diode transistors and an n-channel equalizing transistor control the voltage on the coupling capacitor.
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