AP3127/H GREEN MODE PWM CONTROLLER Description Pin Assignments The AP3127/H is a current mode PWM controller which is optimized for high performance, low standby power and cost effective offline (Top View) flyback converters. The AP3127/H coordinating with Diodes secondary side controller AP4320 and protocol decoding IC AP4370 provide a Flyback charger/adapter solution compatible to Qualcomm Pin 1 Mark Quick Charge 2.0 protocol. The PWM switching frequency at normal operation is internally fixed (about 65kHz for AP3127 and 100kHz for AP3127H). In middle load, 6 GATE GND 1 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 VCC 5 FB 2 IC will enter the burst mode to minimize standby power. Furthermore, the frequency dithering function is built-in to reduce EMI emission. SENSE 3 4 SOVP/UVP 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. Comprehensive protection features are included, such as cycle-by- SOT26 cycle current limit (OCP), VCC Over Voltage Protection (VOVP), internal OTP, Over Load Protection (OLP) and pins fault protection. AP3127/H combines secondary side OVP (SOVP) and UVP. Applications Features Quick Charger Very Low Start-up Current Switching AC-DC Adapter/Charger Current Mode Control ATX/BTX Auxiliary Power Non-audible-noise Green-mode Control Set-top Box (STB) Power Supply Internal Slope Compensation Open Frame Switching Power Supply Soft Start During Startup Process Frequency Fold Back for High Average Efficiency Secondary Winding Short Protection with FOCP Soft Switching for Reducing EMI VCC Maintain Mode 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) Secondary Side OVP (SOVP) and UVP Mini Size Package of SOT26 Totally Lead-free & Fully RoHS Compliant (Notes 1 & 2) Halogen and Antimony Free. Green Device (Note 3) Notes: 1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant. 2. See AP3127/H Typical Applications Circuit USB Port F1 V OUT Xcap L1 R1 D- L2 CE5 CE7 MOV AC D1~D4 T 1 R27 C8 D+ R26 CE2 C4 R11 R12 R2 CE1 NTC1 Q2 GND U 6 R 25 R10 D 7 R17 R16 1 6 ICTRL GND AREF AR345 5 2 DRISR CCM D6 R15 R14 4 3 VDET VCC D8 D5 C5 CE4 CE3 R13 R20 U 4 D8 R7 CY1 R23 R22 4 3 R21 D- VCC Q1 5 AP4370 2 R6 C10 1 6 GND D+ VCC U 3 GATE R17 5 6 3 6 R3 V1 V2 V CTRL VCC R24 C6 U 1 4 SENSE SOVP/ C 7 AP4320 UVP R4/1 R 5 R4/2 R4/3 3 C 1 2 1 AP 3127/H GND VSENSE 2 R18 FB C9 5 4 R8 U 2 VOUT I CTRL GND ICTRL 1 C2 R9 R19 C11 C Y2 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 3 SOVP/UVP Sense pin for secondary side OVP and UVP 4 SENSE Current Sense 5 VCC Supply voltage of driver and control circuits 6 GATE Gate driver output 2 of 13 AP3127/H September 2015 Diodes Incorporated www.diodes.com Document number: DS37920 Rev. 2 - 2 NEW PRODUCT