Based LT3756 buck - boost mode drive circuit diagram

Posted on Mar 28, 2007

A common LED driver requirements are: The LED string voltage and the input voltage is very wide and overlapping. In fact, some designers prefer to use with a LED driver circuit

Based LT3756 buck - boost mode drive circuit diagram
Click here to download the full size of the above Circuit.

for a variety of battery power, and a plurality of different LED strings. Such universal configuration needs to sacrifice some efficiency, component costs and board space expense, in exchange for simplicity of design time to market and product. Figure 1 is a buck-boost mode driver using a single inductor. It accepts 9V to 36V input, it is designed to 400mA of current to drive the LED strings 10V ~ 50V. Inductor current is the input current to the LED string currents; peak inductor current is equal to the peak switch current. In the case of less than 9V input, CTRL analog dimming the LED current will be correspondingly reduced, so that the inductor current under control. UVL0 functional circuit at less than 6VIN off LED. Here, COUT, Dl and MI can withstand up to 95V.

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