ON Semiconductor Corp. (Phoenix, AZ) introduced the NCP1207, a pulse-width modulated (PWM), current-mode controller with quasi-resonant switching capability that reduces power consumption and component count. The NCP1207 is suitable for ac/dc adapters for computer notebooks, offline battery chargers, and power supplies for consumer electronics such as televisions, DVD players, set top boxes and game boxes.
The quasi-resonant design of the NCP1207 minimizes electromagnetic interference and reduces switching losses. An adjustable skip-mode capability under light loads minimizes audible noise generation. The high-voltage start-up, current source offers a clean, loss-less, startup sequence. The NCP1207 is self-supplied from a 40Vdc to 500Vdc rail, so it requires no transformer auxiliary winding or associated passive components. The NCP1207 also features comprehensive protection circuitry, including over-voltage protection, over-current protection and over-temperature shutdown.
The NCP1207 is offered in two space-saving packages - the 7.62mm x 10mm, PDIP-8 package and the 5mm x 6.2mm, SO-8 package. Pricing is $0.55 per unit in 10,000-unit quantities for both package options.
