PWM Current-Mode Controller for Universal Off-Line Supplies Featuring Low Standby Power

Housed in SOIC−8 or PDIP−8 package, the NCP1200A enhances the previous NCP1200 series by offering a reduced optocoupler current together with an increased drive capability. Due to its novel concept, the circuit allows the implementation of complete off−line AC−DC adapters, battery charger or a SMPS where standby power is a key parameter.

FEATUREs
•No Auxiliary Winding Operation
•Auto−Recovery Internal Output Short−Circuit Protection
•Extremely Low No−Load Standby Power
•Current−Mode Control with Skip−Cycle Capability
•Internal Temperature Shutdown
•Internal Leading Edge Blanking
•250 mA Peak Current Capability
•Internally Fixed Frequency at 40 kHz, 60 kHz and 100 kHz
•Direct Optocoupler Connection
•SPICE Models Available for TRANsient and AC Analysis
•Pin to Pin Compatible with NCP1200
•Pb−Free Packages are Available

Typical Applications
•AC−DC Adapters for Portable Devices
•Offline Battery Chargers
•Auxiliary Power Supplies (USB, Appliances, TVs, etc.)