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US 2014/0111090 A1Published application
Temperature foldback circuit for led load control by constant current source
AssigneeMarvell World Trade Ltd.
InventorWanfeng ZHANG
Life of this patent
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Abstract
An apparatus includes an input node, a light-emitting diode (LED) string to receive a current from the input node, a voltage divider to output a control voltage, and a switch to receive the control voltage. The switch coupled to the LED string controls the current through the LED string according to the control voltage.
Claims20
An apparatus comprising:
- an input node;
- a light-emitting diode (LED) string configured to receive a current from the input node, the LED string including a first portion and a second portion, each of the first and second portions including at least one LED;
- a voltage divider configured to output a control voltage;
- and
- a switch configured to receive the control voltage, the switch coupled to the LED string and configured to control the current through the LED string according to the control voltage.
2 more elements
A method comprising:
- supplying a current from an input node to an LED string including a first portion and a second portion, each of the first and second portions including at least one LED;
- outputting a control voltage from a voltage divider to a switch to control the switch;
- and
- controlling the current through the LED string according to the control voltage.
1 more element
Dependencies are inferred from the claim text.