ON Semiconductor NCP1927DR2G

Description
The NCP1927 is a combination IC that integrates the primary side control blocks for power factor correction (PFC) and flyback controllers with sequencing circuitry. It is designed for use in compact, highly efficient Flat Panel TV Switched Mode Power Supplies.

Features

Common General Features
Wide Vcc range from 10 V to 30 V
Very low startup current consumption (≤ 20 μA MAX)
Inverter enable output
Shutdown pin to disable IC
Go to standby input
Pb-Free Device

PFC Controller Features
Critical Conduction Mode (CIM) with Constant On Time Control
Internal Frequency Clamp
Skip Mode Operation During Light Load Conditions
Fast Line / Load Transient Compensation
Accurate and Programmable Maximum On Time Control
Negative Current Sensing
Programmable Overvoltage/Undervoltage Protection
800 mA Source / 1200 mA Sink Gate Drive

Flyback Controller Features
65 kHz Fixed-Frequency Operation with Built-In Ramp Compensation
Frequency Jittering for Softened EMI Signature
Frequency Foldback then Soft-Skip for Improved Performance in Standby
Timer-Based Overload Protection with Auto-Recovery
Protection Against Winding Short-Circuit
4 ms Soft-Start Timer
800 mA Source / 1200 mA Sink Gate Drive

Applications
Flat Panel TV Switched Mode Power Supplies