Power_electronics Features

A New Approach to Circuit Breaker Design Using Silicon Carbide Switches - Nov 21
Mechanical circuit breakers can be low cost with minimal losses, but they operate slowly and wear out. Solid state versions overcome the problems and are becoming increasing viable as replacements at...
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Power Electronics Europe News
Primary-side switcher raises efficiency
Operating up to 80kHz, the 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 noise-free performance for chargers, ADSL adapters and home appliance power supplies.

As a primary side device with an integrated 650 or 700V BVDSS MOSFET, the family eliminates opto-couplers and secondary-side CV/CC control circuitry to minimise 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 (0.6μA, max) combined with a no-load power consumption (75mW, max) and load transient stability are also attributes, says the company.

Devices in the family support adapter power ratings (6.0 to 20W), package types (SO-7 or PDIP-7), and MOSFET voltage ratings (650 or 700V). Members in the family are the 650 AP3983BMTR-G1, 6W in an SO-7 package, the AP3983CMTR-G1, 650V, 7.5W, in an SO-7 package, the 650V AP3983CP7-G1, 10W in a PDIP-7 package, the 650V AP3983DP7-G1,      18W in a PDIP-7 package, the 700V, AP3983EP7-G1, 20W in a PDIP-7 package and the 700V, AP3983RMTR-G1,10W in an SO-7 package.



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