Guaranteed bootstrap hold-up circuit for buck high side switch

Details Guaranteed bootstrap hold-up circuit for buck high side switch Guaranteed bootstrap hold-up circuit for buck high side switch

2006-04-11

2006-04-11

Sterrett, Jeffrey (Department: 2838)

Electricity: power supply or regulation systems

Output level responsive

Using a three or more terminal semiconductive device as the...

C323S285000, C323S288000, C323S901000

Reexamination Certificate

active

07026801

ABSTRACT:
A buck regulator switching power supply (10) selectively enabling a low side device to effectively recharge a bootstrap capacitor (Cboot) during a high duty cycle of operation. The switching power supply (10) includes a gate driver (12) driving a gate of a high side FET (Q1) responsive to a controller circuit (14). Controller circuit (14) includes a controller (16) responsively controlled by a comparator (18). Comparator (18) senses the charge of the charging side of the bootstrap capacitor (Cboot) as compared to a voltage (Vref). The comparator (18) also responsively generates an output signal on an output line (20) as a function of the voltage at the phased output.

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patent: 6037760 (2000-03-01), Borghi et al.
patent: 6172493 (2001-01-01), Grant
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patent: 6650100 (2003-11-01), Kohout et al.
patent: 6812782 (2004-11-01), Grant
patent: 6897643 (2005-05-01), Stone

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