DC/DC controller touts 6-100V input voltage
Keywords:DC/DC controller? high brightness LED? N-channel MOSFET?
The LT3796 uses an external N-channel MOSFET and can drive up to 85V of white LEDs from a nominal 12V input, delivering in excess of 50W. The LT3796 is engineered for charging batteries or supercaps at constant current and voltage. It incorporates a high-side current sense, enabling its use in boost, buck, buck-boost or SEPIC and flyback topologies. Additionally, it offers both input and output current limiting and monitoring for added reliability and design flexibility.
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The LT3796 is geared for driving high brightness LEDs. |
The LT3796 can deliver efficiencies of more than 94 percent in boost mode, minimizing the need for external heat sinking. A frequency adjust pin enables the user to program the frequency between 100kHz and 1MHz, optimizing efficiency while minimizing external component size and cost, added Linear Tech. Combined with a thermally enhanced TSSOP-28 package, the LT3796 offers a highly compact HB LED driver or charger solution.
The LT3796 uses True Color PWM dimming that delivers constant LED color with dimming ranges of up to 3,000:1. For less demanding dimming requirements, the CTRL pin can be used to offer a 10:1 analog dimming range. Its fixed frequency, current-mode architecture ensures stable operation over a range of supply and output voltages.
Robust open and short-circuit protection maximize overall system reliability, whereas C/10 detection optimizes both battery and supercap charging designs. Additional features include frequency synchronization, programmable UVLO and a programmable fault restart timer.
The LT3796EFE is available in a thermally enhanced TSSOP-28 package. Pricing starts at $3.45 each. An extended temperature version, or I-grade, the LT3796IFE, is also available, priced starting at $3.86 each. Finally, a high temperature, or H-grade option, is available, the LT3796HFE with pricing starting at $4.11 each. All prices are in 1,000-piece quantities and all versions are available from stock.
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