High-Side Current Sense DC/DC Converter
Wed, 08/20/2008 - 9:18am
Linear Technology announces the LT3755, a 60 V converter designed to drive high current LEDS. Its 4.5 V to 40 V input voltage range makes it ideal for a wide variety of applications. The converter uses an external N-channel MOSFET and can drive up to 14 1A white LEDs from a nominal 12 V input, delivering in excess of 50 watts. It incorporates a high-side current sense, enabling it to be used in boost, buck, buck-boost, or SEPIC and flyback topologies. The LT3755 can deliver efficiencies of over 94% in boost mode, eliminating any need for external heat sinking. A frequency adjust pin permits the user to program the frequency between 100 kHz and 1 MHz, optimizing efficiency while minimizing external component size and cost.