HV9967B

Supertex inc. Integrated LED Driver with Average-Mode Current Control HV9967B Features ►► 3% accurate LED current ►► Integrated 60V, 0.8Ω MOSFET ►► Low sensitivity to external component variation ►► Single resistor LED current setting ►► Fixed off-time control ►► PWM dimming input ►► Output short circuit protection with skip mode ►► Over-temperature protection ►► Available in compact 8-Lead MSOP and 8-Lead DFN packages Applications ►► DC/DC or AC/DC LED drivers ►► RGB backlighting drivers for flat panel displays ►► General purpose constant current source ►► Signage and decorative LED lighting ►► Chargers General Description The HV9967B is an average-mode current control LED driver IC operating in a constant off-time mode. The IC features an integrated 60V, 0.8Ω MOSFET that can be used as a stand-alone buck converter switch, or connected as a source driver for driving an external high-voltage depletion-mode MOSFET. The HV9967B is powered through its switching output when the integrated switch is off. Hence, the same external MOSFET can be used as a high-voltage linear regulator for powering the IC. The LED current is programmed with one external resistor. The average-mode current control method does not produce a peakto-average error, and therefore greatly improves current accuracy and line and load regulation of the LED current without any need for loop compensation or direct sensing of the LED current at a high-voltage potential. The auto-zero circuit cancels the effects ...