AP3917C UNIVERSAL AC VOLTAGE STEP DOWN POWER SWITCHER Description Pin Assignments The AP3917C is a universal AC voltage step-down power switcher, (Top View) which is specially designed for home appliance and IoT applications with non-isolated buck solution or offline flyback solution. 1 Drain NC 7 The device integrates a 650V high-performance Power MOSFET. Coordinating with a single-winding inductor, it uses fewer external 2 NC components and provides a low Bill of Material (BOM) cost solution. S 3 6 FB The AP3917C can achieve excellent regulation and high-power efficiency. The peak current and switching frequency continuously 4 5 BP S reduce as the load decreases, so it can get excellent efficiency performance at light load and improve the overall system efficiency. SO-7 The AP3917C has multiple protection features to enhance system safety and reliability. It has over-temperature protection, under- voltage lock function, output short protection, overload protection, and open-loop protection. The AP3917C is available in the SO-7 package. Features Applications Non-Isolated Home Appliances: AC Fans, Rice Cookers, Universal 85VAC to 300VAC Input Range Shavers Milk Machines Internal MOSFET of 650V IoT Applications Maximal Peak Current: 420mA Typical Industrial Controls Improved Constant Voltage: 5% Standby and Auxiliary Maximum 270mA Rated Output Current No Load Power Consumption: < 30mW with External Bias Frequency Modulation to Suppress EMI Various Protections: OTP (Over Temperature Protection), OLP (Overload Protection), SCP (Short Circuit Protection) Fewer Components Low Audible Noise Solution SO-7 Package Moisture Sensitivity: MSL Level 3 per J-STD-020 Terminals: Finish Matte Tin Plated Leads, Solderable per M2003 JESD22-B102, Method 208 Weight: 0.077 grams (Approximate) 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. AP3917C Typical Applications Circuit D2 R1 C4 DB1 L1 C5 C6 R3 R2 L2 BP S +V F1 L FB S N NC C1 C2 R4 C 3 D1 Drain NC U1 AP3917C GND Pin Descriptions Pin Number Pin Name Function 1, 2 N/C Not Connected Internally. Recommend to connect to Source for better heat dissipation. 3, 4 S Internal Power MOSFET Source. Ground Reference for BP and FB Pins. 5 BP Connection Point of External Bypass Capacitor for Internally Generated Control Circuit Power Supply. 6 FB Regulator Feedback. 7 Drain Internal Power MOSFET Drain. High-Voltage Current Source Input. 2 of 12 October 2020 AP3917C Diodes Incorporated www.diodes.com Document number: DS41542 Rev. 5 - 2