MIC3230/31TE BOOST EVALUATION BOARD 

The MIC3230/1 are constant current boost switching controllers specifically designed to power one or more strings of high power LEDs. The MIC3230/1 have an input voltage range from 6V to 45V and are ideal for a variety of applications.

The MIC3230/1 utilizes an external power device which offers a cost conscious solution for driving high power LED applications. Power consumption has been minimized through the implementation of a 250mV feedback voltage reference providing an accuracy of ±3%. The MIC3230/1 are dimmable via a PWM input signal and also features an enable pin for low power shutdown. 

The LED current is regulated by keeping the voltage drop across the current sense resistor (R7) constant. The LED current can be set by selecting the value of R7. In this version of the eval board, the output current is limited to 750mA.

Multiple MIC3230 ICs can be synchronized to a common operating frequency by connecting the ICs together through the SYNC pin. This feature is only good on the MIC3230. The clocks of these synchronized devices can be used together which help reduce noise and errors in a system. 

The MIC3231 offers a dither feature to assist in the reduction of EMI. This is particularly useful in sensitive EMI applications, and provides for a reduction in emissions by approximately 10dB.