Variable start-up circuit for switching regulators

Details Variable start-up circuit for switching regulators Variable start-up circuit for switching regulators

2006-10-31

2006-10-31

Patel, Rajnikant B. (Department: 2838)

Electricity: power supply or regulation systems

Output level responsive

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

C323S222000

Reexamination Certificate

active

07129684

ABSTRACT:
The variable start-up circuits basically include a sensor, triggering transistors, current mirror, current source, an N-bit triggering circuit array, and a feedback line. If the sensing voltage does not reach the expected voltage compared to the midpoint voltage of the sensor, the output voltage of the sensor turns on the triggering transistors, which provide a total current to its output through the current mirror until the voltage at feedback reaches the midpoint voltage. The time to reach the midpoint voltage at a load is simply equal to the charge stored at the load divided by the total current, which is controlled by an N-bit digital input and a device aspect ratio of each triggering transistor. Consequently, all variable start-up circuits provide an output voltage level closer to the output voltage level that reaches the equilibrium according to schedule.

REFERENCES:
patent: 5367247 (1994-11-01), Blocher et al.
patent: 6969978 (2005-11-01), Dening
patent: 6975047 (2005-12-01), Pippin

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