AP3983EP7-G1

AP3983E HIGH FREQUENCY PRIMARY SIDE POWER SWITCHER FOR OFF-LINE SMPS ADVANCED PRODUCT NEW INFORMATION Description Pin Assignments The AP3983E is high frequency power switcher for power supplies with better conversion efficiency, better voltage & current accuracy, and improved protection functions. Typical applications include adapter for ADSL, home appliance power supply, LED lighting power supply and PC auxiliary power supplies. The AP3983E with built in MOSFET, regulates the output voltage and current in the primary side by piece-wise Pulse Frequency Modulation (p-PFM) in discontinuous conduction mode (DCM). The system operating frequency reduces linearly from heavy load to light load in each interval of the p-PFM, and enters constant current mode when the load current equals to the maximum system output current. The AP3983E provides operating frequency dithering function to improve EMC performance of power supply. The AP3983E also has built-in fixed cable voltage drop compensation and adjustable line voltage compensation. The AP3983E solution has fewer component number, smaller size, and lower total cost. The AP3983E is packaged in PDIP-7. (Top View) CPC 1 7 GND FB 2 VCC 3 6 D CS 4 5 D PDIP-7 For AP3983E Applications      Adapters Set Top Boxes Auxiliary Supplies Appliances LED Driver Features     Primary Side Control for Eliminating Opto-coupler Valley Switching Turn on for Higher Efficiency and Better EMI Performance Better Transient Characteristics Built-in N Channel MOSFET with 700 BVDSS          Low Start-up Current: 0.2A (Typ.) Internal Output Cable Voltage Drop Compensation Hiccup Function to Improve Short Circuit Protection Better Over Voltage Protection Better Over Temperature Protection Low Total Cost Solution Output Power Range (Note 1) AP3983E for 20W Adapter and 25W in Open Frame Design Totally Lead-free & Fully RoHS Compliant (Note 2 & 3)  Halogen and Antimony Free. “Green” Device (Note 4) Note: 1. Typical continuous power in a non-ventilated enclosed adapter measured at +50°C ambient. 2. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant. 3. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green" and Lead-free. 4. Halogen- and Antimony-free "Green” products are defined as those which contain