IP Library › Patent Application 13756060
Patent Application
App. No. 13/756,060

LED DRIVER WITH EXTENDED DIMMING RANGE AND METHOD FOR ACHIEVING THE SAME

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Quick Facts
Patent No.
US None
App. No.
13/756,060
Abstract

A circuit for powering of a Light Emitting Diode (LED) string has a switching power converter. A brightness control circuit is coupled to the switching power converter to allow a duration of a conductive state of the power converter to exceed a duration of a conductive state of the LED string for maintaining a current magnitude in the LED string constant.

Claims (5)

1 . A method of achieving wide dimming range in an LED driver of a boost type having an inductor and a current control feedback comprising:

storing a state of a current control feedback upon a falling edge of the PWM signal; and

disabling switching of the LED driver after the falling edge of the PWM signal and upon an inductor meeting a reference corresponding to a stored state of a current control feedback.

2 . A method of claim 1 further comprising disconnecting an LED load from an output of the LED driver upon the falling edge of the PWM signal.

3 . A method of claim 1 further comprising synchronizing switching of the LED driver with a rising edge of a PWM signal.

Assignments (3)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Dec 22, 2014
From: SUPERTEX LLC
To: MICROCHIP TECHNOLOGY INCORPORATED
Reel/Frame 034689/0257 →
CHANGE OF NAME Recorded Dec 19, 2014
From: SUPERTEX, INC.
To: SUPERTEX LLC
Reel/Frame 034682/0134 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded May 14, 2013
From: MEDNIK, ALEXANDER; TIRUMALA, ROHIT
To: SUPERTEX, INC.
Reel/Frame 030415/0496 →