Analog internal soft-start and clamp circuit for switching...

Details Analog internal soft-start and clamp circuit for switching... Analog internal soft-start and clamp circuit for switching...

2008-05-27

2008-05-27

Han, Jessica (Department: 2838)

Electricity: power supply or regulation systems

Output level responsive

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

C323S288000

Reexamination Certificate

active

07378827

ABSTRACT:
An analog soft-start circuit for a switching regulator (e.g., a buck converter) including an analog ramp circuit and an open-loop analog voltage clamp circuit. The voltage ramp circuit utilizes a two-stage current divider circuit to generate a very low, stable current signal, and an integrator circuit including a relatively small, integral capacitor to generate the ramp voltage signal in response to the very low current signal. The analog voltage clamp circuit clamps the regulated output signal to the ramp voltage until the ramp voltage signal increases to a predetermined voltage level, thereby causing the regulated output voltage to exhibit the desired soft-start characteristics. The analog clamp circuit includes a current mirror circuit that generates a clamp current that pulls down the error amplifier output stage via a clamping element (e.g., a diode) until the ramp voltage signal reaches a predetermined level.

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