The ADD5211 is a 4-channel, white LED driver for backlight applications based on high efficiency, current mode, step-up converter technology. The boost controller drives an external MOSFET switch for step-up regulation from an input voltage of 4.5 V to 40 V and a pin adjustable operating frequency between 200 kHz and 1.2 MHz. An adjustable UVLO function is implemented to reduce input current during power-off.
The ADD5211 contains four regulated current sinks for uniform brightness intensity. Each current sinks can be driven from 40 mA up to 200 mA and the LED driving current is pin adjustable by an external resistor. The ADD5211 with an input PWM interface drives up to four parallel strings of multiple series connected LEDs with ±1.5% current matching between strings.
Additional features include fault indicator output LED short protection, LED open protection, boost output short protection, overvoltage protection, cycle-by-cycle current limit, and thermal shutdown for both the IC and LED array. The programmable soft start is implemented to reduce inrush current during startup.
LCD monitor and TV LED backlights
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