Diodes Incorporated AP3125 AC/DC PWM Controllers are optimized for high performance and low standby power in cost-effective offline fly-back converters. Designed to improve operating efficiency and eliminate no-load losses, AP3125 devices feature three operating modes. In normal mode, switching frequency is either 65kHz or 100kHz under full load. At lighter loads, the AP3125 controllers automatically enter green mode, where frequency fold-back is used to back-off the frequency and raise average efficiency. Finally, in conditions of no-load or a very light load, AP3125 devices enter a burst mode to minimize standby power. To help minimize audible noise in the system, the SOT26-packaged AP3125 controllers have a minimum switching frequency setting of 20kHz, while a built-in frequency dithering function in normal and green modes ensures a reduction in EMI emissions. In order to help increase system reliability, AP3125 controllers integrate a complete range of protection functions. Internal over-temperature protection and fast over-current protection are included, along with over-voltage and overload protection. The AP3125B and AP3125HB variants also integrate brownout and line over-voltage protection, easily configured using a few divider resistors.
The AP3125 family current mode PWM controllers from Diodes Incorporated are optimized for high performance, low standby power in cost effective offline fly-back converters. They are available in SOT26 package. The AP3125 has three modes of operation to minimize power losses dependent on load. Fixed 65 kHz/100 kHz PWM switching frequency: under full-load. Green mode: At lighter loads the AP3125 automatically switches to PFM with switching frequency fold-back, improving system efficiency. A 20 kHz minimum switching frequency avoids audible noise. Burst mode: under light- or no-load to minimize standby power. Frequency dithering is built-in to reduce EMI emissions. The AP3125 family includes comprehensive protection features such as cycle-by-cycle current limit (OCP), VCC over-voltage protection (VOVP), internal OTP, over-load protection (OLP). The AP3125B/HB has additional brownout (BNO) and line over-voltage protection (LOVP). The AP3125A/V/R/L/HA has different versatile latch/auto protection functions. The AP3125HB/HA has a 100 kHz nominal switching frequency plus.
IC PWM CTLR CURR MODE SOT26
