DK1203 Datasheet – Power Supply Control Chip – DongKe

Part Number: DK1203

Function: Off-line switching power supply control chip

Package: DIP 8 Pin Type

Manufacturer: DongKe


DK1203 Power Supply Control Chip


The DK1203 is Low-power off-line switching power supply control chip.

An off-line switching power supply control chip is an integrated circuit specifically designed for controlling and regulating the operation of an off-line switching power supply. Off-line power supplies are commonly used in applications where the power source is connected directly to the AC mains, such as in desktop computers, televisions, and household appliances.

These control chips are responsible for managing the power supply’s input voltage, providing necessary control signals, and implementing various protection and regulation functions.

  1. Pulse Width Modulation (PWM) Control: These chips generate a PWM signal that controls the switching of the power supply’s primary-side switches, such as MOSFETs or IGBTs. The duty cycle of the PWM signal determines the on-time and off-time of the switches, regulating the output voltage or current.
  2. Voltage Feedback Control: Off-line power supply control chips incorporate feedback control loops to regulate the output voltage. They compare the output voltage with a reference voltage and adjust the PWM signal accordingly to maintain a stable and desired output voltage.
  3. Power Factor Correction (PFC): Many off-line power supply control chips include power factor correction functionality. PFC helps improve the power supply’s input power factor, reducing harmonic distortion and maximizing power efficiency.
  4. Protection Features: These chips provide protection mechanisms to safeguard the power supply and connected components. Common protection features include overvoltage protection, undervoltage lockout, overcurrent protection, overtemperature protection, and short circuit protection.



1. Input voltage 85V to 265V full voltage range

2. Built-in 700V power tube

3. Built-in self-powered circuit (patented), no auxiliary winding power supply

4. Integrated self-starting circuit

5. Current mode PWM control

6. VCC operating voltage range of 4V to 6V

7. 65Khz switching frequency

8. Auto-enter skip cycle mode at light load

9. Over-temperature, over-current, over-voltage, overload protection

10. Standby power consumption is less than 0.3W

11. Frequency jitter reduces EMI filtering cost



DK1203 datasheet pdf

1. AC / DC power adapter
2. DVD / VCD power supply
3. Air conditioning power supply
4. Induction cooker power
5. LED power supply
6. Set-top box power supply



DK1203 Datasheet PDF


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