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AP3971 - PRIMARY SIDE POWER SWITCHER

Download the AP3971 datasheet PDF. This datasheet also covers the AP3965 variant, as both devices belong to the same primary side power switcher family and are provided as variant models within a single manufacturer datasheet.

General Description

The AP3965/66/71 consists of a primary side regulation controller and a high voltage transistor, and is specially designed for off-line power supplies within 12W output power or non-isolated buck applications within 5W.

Key Features

  • Primary Side Control for Eliminating Opto-coupler and Secondary CV/CC Control Circuitry.
  • Built-in NPN Transistor with 700VCBO.
  • Low Start-up Current: 0.2µA (Typ).
  • Internal Output Cable Voltage Drop Compensation.
  • Random Frequency Modulation for Low EMI.
  • Short Circuit Protection.
  • Low Total Cost Solution.
  • Output Power Range (Note 1):.
  • AP3965 for 5W Adapter and 3W Buck.
  • AP3966 for 10W Adapter and 4.5W Buck.
  • AP3971.

📥 Download Datasheet

Note: The manufacturer provides a single datasheet file (AP3965-Diodes.pdf) that lists specifications for multiple related part numbers.

📁 Similar Datasheet

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AP3902 LOW POWER PWM SWITCH BCD
AP393 LOW POWER LOW OFFSET VOLTAGE DUAL COMPARATORS Diodes Incorporated
AP393 LOW POWER LOW OFFSET VOLTAGE DUAL COMPARATORS Anachip

Other Datasheets by Diodes Incorporated

Part Number Description
AP3970 PRIMARY SIDE POWER SWITCHER
AP3917B UNIVERSAL AC VOLTAGE STEP DOWN POWER SWITCHER
AP3917D UNIVERSAL AC VOLTAGE STEP DOWN POWER SWITCHER
AP3927D HIGH-PERFORMANCE AC-DC OFFLINE REGULATOR
AP3928 UNIVERSAL AC VOLTAGE STEP-DOWN POWER SWITCHER

Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

View original datasheet text
A Product Line of Diodes Incorporated AP3965/66/71 PRIMARY SIDE POWER SWITCHER FOR FLYBACK/NON-ISOLATED BUCK SMPS Description The AP3965/66/71 consists of a primary side regulation controller and a high voltage transistor, and is specially designed for off-line power supplies within 12W output power or non-isolated buck applications within 5W. Typical applications include adapter for ADSL, auxiliary supplies or open frame types for appliances. The AP3965/66/71 operates at pulse frequency modulation (PFM), and provides accurate constant voltage, constant current (CV/CC) regulation without requiring an opto-coupler and secondary control circuitry. It has internal cable compensation function for tight constant voltage regulation.