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LED dimming circuit using LT3492

This LED dimming circuit based on the LT3492 triple output DC DC converter introduced by Linear Technology.
LT3492 triple output DC DC converter is designed to operate as a constant-current source  . The LT3492 works buck, boost or buckboost mode and is ideal for driving LEDs. The switching frequency of the LT3492 can be programmed between 330KHz and 2.1 MHz .

The external PWM input provides 3000:1 LED dimming on each channel. The LT3492 has three channels and each channel has a built-in gate driver to drive an external LED-disconnect P-channel  MOSFET, allowing high dimming range. The output current range for each channel of the LT3492 is programmed with an external sense resistor.

The LT3492 use a CTRL pin to adjust the LED current either for analog dimming or overtemperature protection.

The main features of the LT3492 IC are : True Color PWM Dimming Delivers Up to 3000:1 Dimming Ratio , Built-In Gate Driver for PMOS LED Disconnect , Three Independent Driver Channels with 600mA , CTRL Pin Accurately Sets LED Current Sense Threshold Over a Range of 10mV to 100mV ,  Adjustable Frequency: 330kHz to 2.1MHz , Open LED Protection , Input Voltage Range from 3V to 30V  .

LT3492 3000:1 LED dimming circuit

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