Opto-Electronics


LED driver

2 March 2011 Opto-Electronics

Supertex introduced the HV9967, an open loop, average-mode current control LED driver that operates in a constant off-time mode. The IC includes a 60 V, 0,8 Ω MOSFET that can be used as a standalone buck converter or connected as a source driver output for driving an external MOSFET to operate at offline AC line voltages. The HV9967 features a proprietary control method that achieves fast, accurate LED current control through sensing only the switch current. It delivers LED current accuracy of ±3% without sensitivity to external component variation. It utilises average-mode current control, which does not produce a peak-to-average error, and therefore greatly improves LED current accuracy and line and load regulation without requiring loop compensation or direct current sensing.



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