AP3125A

AP3125A GREEN MODE PWM CONTROLLER Description The DIODES™ AP3125A is a current mode PWM controller 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. Internal slope compensation allows more stable Peak-Current Mode control over wide range of input voltage and load conditions. Internal line compensation ensures constant output power limit over entire universal line voltage range. Pin Assignments (Top View) Pin 1 Mark GND 1 FB 2 CTRL 3 6 GATE 5 VCC 4 SENSE SOT26 (K Package) Comprehensive protection features are included, such as cycle-bycycle current limit (OCP), VCC Overvoltage Protection (VOVP), internal OTP, Overload Protection (OLP), and pins’ fault protection. The versatile latch functions can be implemented using a minimal number of external components. Features  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 Sh...