SX1308 DC To DC Step Up Converter Circuit

The SX1308 DC to DC step up converter module is a adjustable power boost converter circuit board, which can convert the input DC 2-24V to DC 2-28V output at a 95% efficiency rate, using 1.2 MHz switching frequency, and capable of delivering a maximum output current of 2 Amp.

SX1308 DC To DC Step Up Converter Circuit Board

The internal soft-start of the IC SX1308 ensures smooth operation, while the automatic shifting to pulse frequency modulation mode at light loads further enhances the boost converter energy-saving capabilities and extends battery life.

Here, we will discuss and explain the workings of this compact DC-DC step-up converter along with its circuit diagram.

Circuit Diagram

Schematic of sx1308 dc to dc step up converter circuit is shown below.

Schematic of SX1308 dc to dc step up converter circuit

Working Explanation

The working principle of the SX1308 DC to DC Step Up Converter circuit is simple. The main component SX1308 6-pin B628 IC (U1) has an error amplifier, PWM comparator, control logic, integrated 80mΩ power MOSFET, current sense amplifier, and OSC.

The input DC supply charged the capacitor (C1), and capacitor (C2) through series setup of inductor (L1) & Schottky diode (D1).

Initially, the Vin pin of the IC (U1) receives the input DC supply and starts switching trough its SW pin and current is passed through inductor (L1) directly from the input DC source. SW is the drain of the internal MOSFET switch and swing between GND and 2-28V.

IC's EN pin is On/Off control input, which is usually connected to the input supply for automatic startup.

During the IC turn-on stage, it inducing a magnetic field in the insuctor, generating a high voltage spike. In the IC turn-off stage, the voltage spike passes through diode, which blocks reverse current to the circuit and increases the voltage of capacitor (C2), up to 28 volts.

The output voltage is controlled through a potentiometer (R1) and resistor (R2) voltage divider setup, which is reffering a 0.6V signal voltage to the IC FW pin. The internal control logic easily adjusts to the required output voltage level and continously mainting the set voltage in a load condition.

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