A 60V DC/DC controller from Linear Technology has been designed to operate as a constant-current source and constant-voltage regulator.
Its features an internal PWM dimming generator for driving high current LEDs, but is also suitable for charging batteries and supercapacitors.
The LT3761 has a 4.5V to 60V input voltage range making it ideal for automotive, industrial and architectural lighting. This device uses an external N-channel MOSFET and can drive up to fifteen 1A white LEDs from a nominal 12V input, which the company advises can deliver in excess of 50 watts.
It incorporates a high-side current sense, enabling its use in boost mode, buck mode, buck-boost mode or SEPIC topologies.
Potential Efficiencies of over 94 percent are possible in the boost topology, eliminating 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.
This device has an internal PWM generator that delivers dimming ratios as high as 50:1.
Linear Technology Enter
