Description The HA16178P/FP is a power-factor correction (PFC) controller IC. This IC adopts continuous conduction mode as PFC operation. Various functions such as over voltage detection, over current detection, soft start, feedback-loop disconnection detection, are incorporated in a single chip. This eliminates a significant amount of external circuitry. PFC operation can be turned on and off by an external control signal. By using this function, PFC operation can be disabled at low input voltage, allowing remote control from the secondary side. A soft-start control pin provides for the easy adjustment of soft-start operation, and can be used to prevent overshooting of the output voltage. Features · Maximum ratings Power-supply voltage Vcc: 24 V Operating junction temperature Tjopr: ­40 to 125°C · Electrical characteristics VREF output voltage VREF: 5.0 V ± 3% UVLO operation start voltage VH: 10.5 ± 0.7 V UVLO operation stop voltage VL: 9.0 ± 0.5 V PFC output maximu