General Description
The LM3464 is a 4-channel high voltage current regulator that
provides a simple solution for LED lighting application. It incorporates
four individual current regulator channels, work 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 interface with the external power supply to adjust the LED
supply voltage to the lowest level that adequate to maintain
all the string currents in regulation, yielding the optimal overall
efficiency.
Digital PWM or analog voltage signal can be used to control
the duty cycle of the all the channels. When analog control is
selected, the dimming frequency can be programmed via an
external capacitor. A minimum duty cycle control is provided
in condition the analog dimming is configured as thermal
feedback.
Protection features includes VIN under-voltage lock-out, LED
open/short circuit and over