The LM3464/64A is a 4-channel high voltage current regulator that provides a simple
solution for LED lighting applications. The LM3464/64A provides four individual current regulator
channels and works in conjunction with external N-channel MOSFETs and sense resistors to give
accurate driving current for every LED string. Additionally, the Dynamic Headroom Control (DHC)
output can be interfaced to the external power supply to adjust the LED supply voltage to the
lowest level that is adequate to maintain all the string currents in regulation, yielding the
optimal overall efficiency.
Digital PWM or analog voltage signals can be used to control the duty cycle of the all
the channels. When analog control is used, the dimming frequency can be programmed via an external
capacitor. A minimum duty cycle control is provided in the conditions that the analog dimming is
configured as thermal feedback.
Protection features include VIN under-voltage lock-out, LED open/short circuit and
over-temperature fault signaling to the system controller.
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