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 peak-to-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 of the input offset voltage and of the propagation delay of the current sense comparator.

  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