Functional description

The HC2502 chip is a special small power switch power supply control chip, widely used in power adapter, LED power supply, induction cooker, air

Adjust, DVD and other small household appliances.

I. product features

• double chip design and bipolar transistor design for hv switch tube to reduce product cost; Control circuit mining

Large scale MOS digital circuit design and E - pole drive mode drive bipolar crystal chip to improve the high - voltage switch

The safe withstand voltage of the tube. Built - in self - powered circuit, the chip does not need external power supply, effectively reduce external elements

Quantity and cost of parts.

• the chip is integrated with a high-voltage constant current startup circuit without external startup resistance.

• built-in overcurrent protection circuit, overload protection circuit, output short circuit protection circuit, temperature protection circuit and optical lotus root failure

Protective circuit.

• built-in slope compensation circuit to ensure circuit stability at low voltage and high power output.

• built-in PWM oscillation circuit, and equipped with buffeting function, ensures good EMC characteristics.

• the built-in frequency conversion function automatically reduces the working frequency when standby, which meets the European green energy standard (< 0.3w)

The output voltage ripple is reduced.

• built-in high voltage protection, when the input bus voltage is higher than the protection voltage, the chip will be shut down automatically and the delay restart will be performed.

• built - in ramp current drive circuit reduces the power consumption of the chip and increases the circuit efficiency.