Primary-side switcher integrates 700V MOSFET

September 12, 2016 // By Graham Prophet
A family of primary-side power switchers is designed to enable the high conversion efficiency needed to meet Energy Star Level 6 and EU CoC Tier 2 requirements.

Operating up to 80 kHz, Diodes’s AP3983 series employs piecewise Pulse Frequency Modulation (p-PFM) in discontinuous conduction mode to regulate the primary-side voltage and current to better than ±5% and provide an audible noise-free solution for chargers, ADSL adapters and home appliance power supplies.

As a primary side device with an integrated 650V or 700V BVDSS MOSFET, the AP3983 family eliminates opto-couplers and secondary-side CV/CC control circuitry to minimize external component count. Other features include built-in fixed cable voltage-drop compensation, adjustable line-voltage compensation and a range of safety functions, such as, over-voltage and over-temperature protection, and a hiccup function to improve response to short circuits.

A low start-up current (0.6 μA, max) combined with a no-load power consumption (75 mW, max) and high load transient stability all contribute to an integrated and cost-effective solution for consumer power supplies.

Devices in the AP3983 family support ranges of adapter power ratings (6W to 20W), package types (SO-7 or PDIP-7), and MOSFET voltage ratings (650V or 700V). These specifications and the respective unit pricing in 1000 piece quantities are as follows:

  • AP3983BMTR-G1 6W SO-7 650V $0.22
  • AP3983CMTR-G1 7.5W SO-7 650V $0.25
  • AP3983CP7-G1 10W PDIP-7 650V $0.27
  • AP3983DP7-G1 18W PDIP-7 650V $0.31
  • AP3983EP7-G1 20W PDIP-7 700V $0.36
  • AP3983RMTR-G1 10W SO-7 700V $0.31

Diodes Inc.: