Micrel rolled out the MIC3203, a new step-down high-brightness LED (HBLED) driver controller IC with high-side current sense and PWM dithering feature for EMI control. This device is targeted at LED driver solutions for high-current MR-16 lamps, track/pathway lighting and other architectural lighting applications.
The MIC3203 is capable of driving multiple HBLEDs in series at more than 90% efficiency with ±5% current accuracy from input voltages of 4,5 V to 42 V. With its hysteretic control architecture and high-side current sense scheme, the device is optimised to drive the HBLEDs with constant current. Operating frequency is adjustable up to 1,5 MHz to allow flexibility in the design. The chip features a dedicated PWM dimming pin, an enable pin for low-power shutdown, over-temperature protection and an under-voltage lockout. The MIC3203 has an external power switch and requires no external compensation.
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