Corporation launched dual output buck LED driver

Corporation launched DC/DC buck converter LT3475 dual output 36V, up to 2MHz, the device is designed as a dual channel constant current LED driver operation. Each channel has an internal sense resistor and dimming control function, which is very suitable for driving up to 1.5A current of LED.

The way a channel to the difference between 180o and another phase of the channel switching operation, thereby reducing the input ripple. Each channel in the current range of 50mA to 1.5A in the independent to maintain high output current accuracy at the same time, the unique true color PWM (True Color PWMTM) circuit allows the dimming range of 3000:1, and no LED color light is usually associated with current relevant changes. The LT3475 has a wide input voltage range of 4V to 36V (transient voltage up to 40V), which can be regulated in a wide range of power supplies for two Li ion batteries and 5V logic rails to unregulated wall transformers and automotive power systems. The switching frequency by a single resistance set in the 200kHz to 2MHz range, so you can use tiny inductors and ceramic capacitors. The device uses a thermally enhanced TSSOP-20 package, which is a very compact solution for driving high current LED.

LT3475 adopts high side detection methods, to achieve the LED cathode grounding connection, so no LED loop in most applications. Each channel also has an integrated boost diode that further reduces the solution to the board area and reduces the cost. Other features include LED open circuit and short circuit protection. The LT3475EFE 20 TSSOP package is available in stock and is purchased in bulk at a price of $3.50 per piece. "I" version of the LT3475IFE also available from stock, in order to buy 1000 units in bulk, each starting price of $4.20.

Performance summary: LT3475 true color PWM in the 3000:1 dimming range provides constant color

Wide input range: 4V to 36V, the maximum value is 40V LED from 50mA to 1.5A current can be accurately controlled and adjustable high voltage side current detection allows the LED cathode grounding work accurate and adjustable 200kHz to 2MHz switching frequency inverting switch operation to reduce the ripple with small inductors and ceramic capacitors using compact 20 lead TSSOP thermally enhanced surface mount package