LM3405XEVAL

TEXAS INSTRUMENTS LM3405XEVAL LM3405 LED Driver Evaluation Board with Thermal Shutdown and Over-Current Protection

The evaluation board is configured to drive a series string of high power, high brightness s 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 VOMIN of 205mV the reference voltage to a VOMAX 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