LM3405XEVAL Datasheet PDF - TI

The LM3405XEVAL evaluation board is configured to drive a series string of high power, high brightness LEDs at a forward current of 1A using the LM3405 constant current buck regulator. The board can accept a full input operating range of 3V to 15V. The converter output voltage adjusts as needed to maintain a constant current through the LED array. The LM3405 is a step down regulator with an output voltage range extending from a VO(MIN) of 205mV (the reference voltage) to a VO(MAX) determined by the maximum duty cycle (typically 94%). It can drive up to 3 LEDs in series at 1A forward current, with the single LED forward voltage of approximately 3.7V (Typical of white, blue and green LEDs using InGaN technology).

● Input voltage range of 3V to 15V

● 1.6MHz switching frequency

● EN/DIM input for enabling and PWM dimming of LEDs

● 300mR NMOS switch

● 40nA shutdown current at VIN = 5V

● Internally compensated current mode control

● Cycle by cycle current limit

● Input voltage UVLO

● Over current protection