Apparatus and method for high-frequency PWM with soft-start

Details Apparatus and method for high-frequency PWM with soft-start Apparatus and method for high-frequency PWM with soft-start

2006-09-12

2006-09-12

Nguyen, Matthew V. (Department: 2838)

Electricity: power supply or regulation systems

Output level responsive

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

C323S284000

Reexamination Certificate

active

07106036

ABSTRACT:
A boost regulator circuit with soft-start is arranged for high-frequency pulse width modulation of LED current. When a shutdown signal is asserted, all circuitry in the boost regulator circuit is disabled, except for circuitry needed for a shutdown delay timer. Also, when the shutdown signal is asserted, the shutdown delay timer begins. If the shutdown signal is de-asserted before the shutdown delay timer expires, the boost regulator circuit resumes normal operation and soft-start is not employed. If the timer expires before the shutdown signal is de-asserted, a soft-start timer is reset, and the entire boost regulator circuit is disabled. When the shutdown signal is de-asserted after the soft-start timer is reset, soft-start is employed.

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Maxim Integrated Products, “High-Efficiency, 26V Step-Up Converter for White LED Main and Subdisplay Backlighting”, MAX 1582. Apr. 2003, Can be found at www.maxim-ic.com.

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