AP3304 MULTI-MODE PWM CONTROLLER Description Pin Assignments The AP3304 is a Peak-Current control, Multi-Mode CCM+ QR PWM controller which is optimized for high performance, low standby power (Top View) and cost effective offline flyback converters. Pin 1 M ark At light load, the AP3304 operates in burst mode with 23kHz switching frequency to minimize standby power consumption and avoid the audible noise. When the load increases, the AP3304 will enter QR mode with frequency fold-back to improve system efficiency and EMI GATE GND 1 6 performance. In QR mode, the maximum switching frequency is clamp to 100kHz to reduce switching power loss. If the switching frequency FB 5 VCC 2 reaches upper limit of the AP3304, the switching frequency starts to fall as the load increase until entering CCM with fixed switching frequency 80kHz to optimize power conversion efficiency. Furthermore, the DEM SENSE 3 4 frequency dithering function is built in to reduce EMI emission. Internal piecewise linear line compensation ensures constant output SOT26 (Type A1) power limit over entire universal line voltage range. Comprehensive protection features are included, such as brown out protection, cycle-by-cycle current limit (OCP), VCC Over Voltage Protection (VOVP), Secondary-side Output OVP (SOVP) and UVP Applications (SUVP), internal OTP, Over Load Protection (OLP) and pins fault protection. Switching AC-DC Adapter/Charger ATX/BTX Auxiliary Power Features Set -Top Box (STB) Power Supply Open Frame Switching Power Supply Very Low Start-Up Current Multi-Mode Control with CCM+QR Soft Start During Startup Process Frequency Fold Back for High Average Efficiency Constant Over Current Protection Secondary Winding Short Protection with FOCP Frequency Dithering for Reducing EMI Useful Pin Fault Protection: SENSE Pin Floating FB/Opto-Coupler Open/Short Comprehensive System Protection Feature: VCC Over Voltage Protection (VOVP) Over Load Protection (OLP) Brown Out Protection (BNO) Secondary Side OVP (SOVP) and UVP (SUVP) Mini Size Package of SOT26 (Type A1) Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2) Halogen and Antimony Free. Green Device (Note 3) For automotive applications requiring specific change control (i.e. parts qualified to AEC-Q100/101/200, PPAP capable, and manufactured in IATF 16949 certified facilities), please contact us or your local Diodes representative. AP3304 Typical Applications Circuit CY1 L2 F1 T1 R25 CON1 Q3 BD1 Vo L1 C1 C2 C5 R11 AC D - C3 C4 + D R19 C9 NTC1 D5 L 3 CC1 R10 CC2 Q2 GND R2 U3 C12 D6 C15 C10 DRISR VCC R13 SR IC R14 R15 VDET GND R20 D7 VDD REF R12 C11 Q1 R6 VCC PWR EN VBUS ISENP DEM C13 VCC GATE DN U4 R7 GND DP AP43771V SENSE C6 CC R 4 R18 OCDRV 1 R 8 AP3304 CC2 IFB VFB OTP V5V GND FB U2 C19 5 C20 C16 C18 RT2 C8 R22 Figure 1 Pin Descriptions Pin Number Pin Name Function 1 GND Signal ground. Current return for driver and control circuits 2 FB Feedback. Directly connected to the opto-coupler Valley detection for QR control, AC line voltage detection for Brown-in/Brown-out, Sample output 3 DEM voltage for SOVP and SUVP, OCP line compensation current setting. 4 SENSE Current sense 5 VCC Supply voltage of driver and control circuits 6 GATE Gate driver output 2 of 12 October 2021 AP3304 Diodes Incorporated www.diodes.com Document number: DS43559 Rev. 4 - 2