Phoenix, Ariz.—ON Semiconductor's NCP1603, a combination power factor correction and pulse width modulation (PFC/PWM) controller with integrated standby and high-voltage startup circuitry, simplifies the design of off-line, AC/DC power supplies. The integrated solution, versus separate PFC and PWM controllers, saves up to 10 additional (external) components. Target applications for this device include notebook and LCD adapters.
The NCP1603’s PFC stage, which is disabled in light-load and no-load conditions to easily meet the limits on standby power consumption established by such "Green Supply" organizations as the California Energy Commission and Energy Star (current guidelines limit standby power consumption to 500 mW), provides near-unity power factor. Normally, it works in the fixed frequency, discontinuous conduction mode (DCM), which reduces EMI. Under demanding operating conditions, it operates in the critical (conduction) mode (CRM) to maintain supply stability, also without power factor degradation. The voltage-mode stage features programmable switching frequency for DCM operation and can synchronize PWM and PFC operation to improve noise immunity. The PFC stage includes inrush current detection, programmable over-current protection, and over-voltage protection.
The current-mode PWM stage can be implemented in the continuous conduction or discontinuous conduction modes. In the standby mode, the PFC bias voltage is disabled and the circuit enters in skip mode, which yields a no-load power consumption of less than 200 mW. This PWM stage features an internal 2.5-ms soft start, and low jitter for improved EMI performance.
The datasheet can be secured by clicking here. The NCP1603 is offered in an SOIC-16 package and priced at 96 cents each in 10k quantities.
ON Semiconductor, 1-602-244-6600,