12V LED driver circuit
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12V LED driver circuit
The buck/boost converter must be used when the input voltage can be higher or lower than the total voltage drop of the LED or LED string. A circuit based on the LT°C3783 buck/boost converter drives eight 1.5A series LEDs as shown in Figure 4. The input voltage range of the LED string driving circuit is 9~36V, and the total voltage drop range of the LED string is 18~37V. Under the condition of VIN=14.4V, Vo=36V and I0=1.5A, the output power is 54W, and the efficiency is up to 93%. The switching frequency of the circuit is determined by the IC pin FREQ
Resistor R5 is set (frequency range is 20kHz~1MHz). The voltage divider composed of R7 and R8 sets the output overvoltage protection level. R4 is connected between IC pin FBP and high side line to sense LED current. The LTC3783 supports multiple topologies. It can also be used to construct circuits such as boost converters and buck converters.
Flyback converters, single-ended primary inductor converters (SEPIC), and CUK regulators can all increase or decrease the input voltage.
The output and input voltage can be the same or opposite in polarity. Each topology has unique advantages, but is less efficient than a buck-boost regulator.
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