Off-line switcher integrates HV transistor for higher charger efficiency
Designed as a primary-side controller, the AP3984 optimises 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 ±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 highly integrated solution that also meets Energy Star 6.0 efficiency criteria with a standby power of less than 10 mW. Multiple PWM/PFM switching modes combined with a frequency dithering function further aid efficiency while improving EMC performance and reducing audible noise.
In SO-7 package the AP3984MTR-G1 power switcher is priced at $0.27 (1000).
Diodes Inc.; www.diodes.com
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