Microchip | MIC3231YTSE

The MIC3231YTSE/2 are constant current boost switching controllers specifically designed to power one or more strings of high power LEDs. The MIC3230/1/2 have an input voltage range from 6 V to 45 V and are ideal for a variety of solid state lighting applications. 

The MIC3230/1/2 utilizes an external power device which offers a cost conscious solution for high power LED applications. The powerful drive circuitry can deliver up to 70 W to the LED system. Power consumption has been minimized through the implementation of a 250 mV feedback voltage reference providing an accuracy of ±3%. The MIC323x family is dimmable via a pulse width modulated (PWM) input signal and also features an enable pin for low power shutdown. Multiple MIC3230 ICs can be synchronized to a common operating frequency. The clocks of these synchronized devices can be used together in order to help reduce noise and errors in a system.

An external resistor sets the adjustable switching frequency of the MIC3230/1. The switching frequency can be between 100 kHz and 1 MHz. Setting the switching frequency provides the mechanism by which a design can be optimized for efficiency (performance) and size of the external components (cost). The MIC323x family of LED drivers also offer the following protection features: Over voltage protection (OVP), thermal shutdown and under-voltage lock-out (UVLO). 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 or emissions by approximately 10 dB. The MIC3232 is a 400 kHz fixed frequency device offered in a small MSOP-10 package. The MIC3230/1 are offered in both the EPAD TSSOP-16 package and the 3 mm × 3 mm MLF®-12 package.

Key Features:

• 6 V to 45 V input supply range.
• Capable of driving up to 70 W.
• Ultra low EMI via dithering on the MIC3231.
• Programmable LED drive current.
• Feedback voltage = 250 mV ±3%.
• Programmable switching frequency (MIC3230/1) or 400 kHz fixed frequency operation (MIC3232).
• PWM Dimming and separate enable shutdown.
• Frequency synchronization with other MIC3230s.
• Protection features:
• Over Voltage Protection (OVP).
• Over temperature protection.
• Under-voltage Lock-out (UVLO).
• –40°C to +125°C junction temperature range.

Applications:

• Street lighting.
• Solid state lighting.
• General illumination.
• Architectural lighting.
• Constant current power supplies.