Linear has 110V led controller for lighting applications
Linear Technology has unveiled the LT3795; a 110V, high side current sense dc/dc converter designed to regulate a current or voltage to a constant value.
Suitable for driving high brightness leds, the device's 4.5 to 110V input voltage range makes it ideal for applications including automotive, industrial and architectural lighting.
The LT3795 uses an external, low side N-channel mosfet and can drive up to 90V of white leds from a nominal 12V input, delivering in excess of 50W. Spread spectrum frequency modulation reduces EMI emissions, while an internal PMOS switch driver delivers robust short circuit protection in boost and buck-boost topologies.
Linear says the device can deliver efficiencies of more than 94% in boost mode, minimising the need for external heat sinking. A frequency adjust pin permits the user to program the frequency between 100kHz and 1MHz, optimising efficiency while minimising external component size and cost.
