GP4504MTR-G1

GP4504 PRIMARY SIDE POWER SWITCHER FOR OFF-LINE SMPS Description Pin Assignments The GP4504 is a power switcher for power supplies with better conversion efficiency, better voltage & current accuracy, and improved protection functions. Typical applications include charger, adapter for ADSL, home appliance power supply and PC auxiliary power supplies. The GP4504 with built in BJT, regulates the output voltage and current in the primary side by piece-wise pulse frequency modulation (p-PFM) and primary current peak amplitude modulation (AM) 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 operating frequency is fixed at medium load by varying primary current peak amplitude. (Top View) FB 1 CBC 2 VCC CS The GP4504 has good transient characteristics in combination with the secondary side IC like AP4341/AP43410. Typically, minimal voltage of 4.3V at PCB side can be achieved for dynamic test of 5V application system. The GP4504 provides operating frequency dithering function to improve EMC performance of power supply. The GP4504 also has programmable cable voltage drop compensation function by external resistor. The GP4504 is packaged in SO-7. 7 GND 3 6 C 4 5 C SO-7 Applications     Adapters Set Top Boxes Auxiliary Supplies Appliances Features        Primary Side Control for Eliminating Opto-coupler Built-in 700V BJT Excellent Transient Characteristics High Voltage and Super-speed Start up External Adjustable Output Cable Voltage Drop Compensation Ultra-low No-load Power Consumption(