DESCRIPTION

· The NCP1615 is a high voltage PFC controller designed for driving PFC boost stages using the Current Controlled Frequency Foldback (CCFF) method.

· It operates in critical conduction mode (CrM) when the inductor current exceeds a programmable value and reduces frequency to about 26 kHz at sinusoidal zero-crossing for light loads.

· The device features an integrated high voltage start-up circuit, eliminating the need for external start-up components and minimizing power consumption during normal operation.

· Packaged in a SOIC-16, it supports robust and compact PFC stages with minimal external components.

FEATURES

· Integrated high voltage start-up with brownout detection.

· Adjustable bulk voltage hysteresis in standby mode via Restart pin.

· Skip mode near line zero crossing and fast line/load transient compensation.

· Valley switching for improved efficiency and high drive capability (-500 mA/+800 mA).

· Wide VCC range from 9.5 V to 30 V and input voltage range detection.

· Power saving mode enabling < 30 mW no-load power consumption.

· Safety features include adjustable bulk undervoltage detection, soft overvoltage protection, overcurrent protection, and internal thermal shutdown.

APPLICATIONS

· PC power supplies.

· Off-line appliances requiring power factor correction.

· LED drivers.

· Flat TVs.