MIC3223TE-BOOST EVALUATION BOARD

The MIC3223 is a constant-current boost switching controller specifically designed to power a string of highpower LEDs. The MIC3223 has an input voltage range from 4.5V to 20V and is ideal for a variety of applications. The MIC3223 evaluation board is designed to accommodate for a VIN of 6V to 20V.

The MIC3223 utilizes an internal power device which offers a cost-conscious solution for driving high-power LED applications. Power consumption has been minimized through the implementation of a 200mV feedback-voltage reference providing an initial accuracy of ±5%. The MIC3223 controller is dimmable via a PWM input signal. An external FET (Q1) is in series with the LED string and is used to PWM Dim the LEDs. The MIC3223 also features an enable pin for low-power shutdown. The LED current is regulated by keeping the voltage drop across the current-sense resistor (R5) constant. The LED current can be set by selecting the value of R5. In this version of the evaluation board, the output current is limited to 700mA.