Secondary side post regulation for LED backlighting

Details Secondary side post regulation for LED backlighting Secondary side post regulation for LED backlighting

2011-04-12

2011-04-12

Choi, Jacob Y (Department: 2821)

Electric lamp and discharge devices: systems

Plural load device systems

C315S320000, C315S257000, C315S291000, C345S082000

Reexamination Certificate

active

07923943

ABSTRACT:
A secondary side post regulator arrangement for a plurality of LED strings. For each secondary winding, a first electronically controlled switch is provided arranged to control the power output, and a LED string is connected thereto. A second electronically controlled switch is further connected in series with the LED string, arranged to receive a PWM signal, thereby pulsing current through the LED string. A current sensing element is further provided outputting a voltage representation of the current through the LED string, and a synchronized sampling circuit is provided arranged to sample the voltage representation during the on period of the second electronically controlled switch. The sampled and held voltage representation is compared with a reference signal and fed back to control the first electronically controlled switch. The voltage output associated with each secondary winding is controlled, responsive to the reference voltage.

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Texas Instruments Application Note “A Revolutionary Power Management Solution for Highly Efficient, Multiple Output Applications”, published 2001, Dallas, Texas.

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