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Home Electronics News

Diodes Incorporated’s Power Switcher with HV Transistor Improves Efficiency of Line-Powered Chargers

Electronics Maker by Electronics Maker
February 21, 2017
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AP3984Plano, Texas – February 21st, 2017 – Offering a cutting-edge solution for consumer and industrial applications with its unique integrated high-voltage (HV) start-up circuit, the AP3984 introduced by Diodes Incorporated is a high-performance power switcher for line-powered chargers and adaptors. Delivering increased conversion efficiency with better voltage and current accuracy, the AP3984 also features ultra-low power consumption and improved protection functions.
Designed as a primary-side controller, the AP3984 realizes excellent transient characteristics when combined with secondary-side ICs such as the AP4341/2, supplying outputs above 4.3V. This is achieved with current and voltage tolerances of just ±5%. The built-in start-up circuit with integrated 700V bipolar junction transistor also eliminates external resistors, simplifying system design and allowing the AP3984 to directly switch the line input. The AP3984 also has a programmable line voltage drop-compensation function.
With protection features such as over-voltage, open- and short-circuit protection, and over-temperature protection (OTP) with auto-restart, the AP3984 provides a high- performance, highly integrated and cost-effective solution that also meets Energy Star 6.0 efficiency criteria with a standby power of less than 10mW. Multiple PWM/PFM switching modes combined with a frequency dithering function further aid efficiency while improving EMC performance and reducing audible noise.

Tags: Semiconductor & IC
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