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AP31261 - GREEN MODE PWM CONTROLLER

General Description

The AP31261 is a current mode PWM controller which is optimized for high performance, low standby power and cost effective offline flyback converters.

Key Features

  • are included, such as cycle-bycycle current limit (OCP), VCC Over Voltage Protection (VOVP), internal OTP, Over Load Protection (OLP) and pins’ fault protection. Features (Top View) Pin 1 Mark GND 1 FB 2 CTRL 3 6 GATE 5 VCC 4 SENSE SOT26.
  • Very Low Start-up Current.
  • Current Mode Control.
  • Non-audible-noise Green-mode Control.
  • Internal Slope Compensation.
  • Soft Start During Startup Process.
  • Frequency Fold Back for High Average Efficiency.
  • Secondary Winding Sho.

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Full PDF Text Transcription for AP31261 (Reference)

Note: Below is a high-fidelity text extraction (approx. 800 characters) for AP31261. For precise diagrams, and layout, please refer to the original PDF.

NEW PRODUCT Description A Product Line of Diodes Incorporated AP31261 GREEN MODE PWM CONTROLLER Pin Assignments The AP31261 is a current mode PWM controller which is opti...

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Assignments The AP31261 is a current mode PWM controller which is optimized for high performance, low standby power and cost effective offline flyback converters. The PWM switching frequency at normal operation is internally fixed (about 65kHz). In middle load, the IC will enter green mode to improve system efficiency with the help of frequency foldback. A minimum switching frequency (about 20kHz) is set to avoid the audible noise. In no load or light load, the IC will enter the burst mode to minimize standby power. Furthermore, the frequency dithering function is built-in to reduce EMI emission.