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DK503 Datasheet Adjustable Buck Switching Power Supply

Manufacturer: Dongke Semiconductor

Overview: DK503 Small household appliances adjustable BUCK switching power supply PRODUCT OVERVIEW DK503 is a wide output voltage non-isolated low-power AC/DC converter chip. The chip is designed in high integrated CMOS circuit, and has the protection functions of output short circuit, over temperature, over voltage and so on. Built-in high-voltage start-up and self-power module, can real-time monitoring and response to load conditions.

General Description

Chip power pin Chip power pin Feedback foot Power supply pin Input Pin, external rectified DC input voltage http://.dkpower.cn 2 EXTREME WORKING RANGE Project Symbols Min Supply voltage VDD US -0.3 PIN voltage UPV -0.3 Breakdown Voltage UPP -0.3 Peak current IPEAK Total dissipation power PTOT Operating temperature -25 TR range Storage temperature -55 TSTG range Welding temperature TW DK503 Typ 800 280/5S Max 7 VDD+0.3 700 700 125 150 Unit V V V mA mW ℃ ℃ ℃ ELECTRICAL CHARACTERISTICS（TA = 25℃ Unless otherwise stated） Description VDD operating voltage VDD startup voltage VDD restart voltage VDD protection voltage Power tube withstand voltage Peak current protection PWM output frequency Temp

Key Features

  • Full voltage input 85V-265V.
  • Built-in 700V high voltage power tube.
  • High voltage constant current starting circuit is integrated inside, no external starting resistance is needed.
  • Patented self-powered technology, no external auxiliary winding power supply.
  • Built-in peak current adjustment function, according to the load real-time adjustment peak current, stable working frequency.
  • The output voltage can be adjusted by FB resistance.
  • Over-temperature, over-vol.

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