High Performance Off-line PWM Converters - DK1203 Datasheet

Oct 12, 2026

This technical document provides a comprehensive overview of the DK1203, a high-performance fly-back AC-DC switched-mode power supply control chip developed by Dongke Semiconductor. Designed with advanced CMOS integration, the chip features a built-in 700V high-voltage BJT and patented self-power supply circuitry, which minimizes the need for external components and simplifies transformer design. It supports global input voltages from 85V to 265V AC, offering a switching frequency of 65KHz and low no-load power consumption of under 0.3W. The DK1203 includes robust built-in protection mechanisms against over-temperature, over-voltage, over-current, and short-circuit conditions, making it an ideal choice for diverse applications such as AC-DC power adapters, LED lighting, air conditioning systems, and consumer electronics like DVD players or monitors. The document also includes pin configuration details and power ratings for both ordinary and top-grade DIP-8 packaged versions, serving as a critical reference for engineers designing isolated power supply circuits.

LanguageEnglish

CategoryTechnology

FormatPDF

Pages1

Reading Time3 min

AccessFree to download

Product Overview

Applications

Main Features

Package and Order Information

Function Structure Diagram

FAQs

What are the primary applications for the DK1203 chip?

The DK1203 is suitable for AC-DC power adapters, LED power supplies, air conditioner power supplies, and power supplies for DVD, VCD, TV, and monitor equipment.

What protection functions are integrated into the DK1203?

It includes protection against short-circuit output, secondary-side open circuit, over-temperature, over-voltage, and over-current conditions.

How does the DK1203 simplify power supply design?

The chip features a built-in 700V high-voltage BJT and a patented self-power supply circuit, which significantly reduces the number of required external components and enables a simple two-winding transformer design.

Oct 12, 2026

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