NCP1200D40R2G - 

Housed in SOIC-8 or PDIP-8 package, the NCP1200 represents a major leap toward ultra-compact Switchmode Power Supplies. Due to a novel concept, the circuit allows the implementation of a complete offline battery charger or a standby SMPS with few external components. Furthermore, an integrated output short-circuit
protection lets the designer build an extremely low-cost AC-DC wall adapter associated with a simplified feedback scheme. With an internal structure operating at a fixed 40 kHz, 60 kHz or 100 kHz, the controller drives low gate-charge switching devices like an IGBT or a MOSFET thus requiring a very small operating power. Due to current-mode control, the NCP1200 drastically simplifies the design of reliable and cheap offline converters with extremely low acoustic generation and inherent pulse-by-pulse control. When the current setpoint falls below a given value, e.g. the output power demand diminishes, the IC automatically enters the skip cycle mode and provides excellent efficiency at light loads. Because this occurs at low peak current, no acoustic noise takes place. Finally, the IC is self-supplied from the DC rail, eliminating the need of an auxiliary winding. This feature ensures operation in presence of low output voltage or shorts.
Features:

No Auxiliary Winding Operation

Internal Output Short-Circuit Protection

Extremely Low No-Load Standby Power

Current-Mode with Skip-Cycle Capability

Internal Leading Edge Blanking

250 mA Peak Current Source/Sink Capability

Internally Fixed Frequency at 40 kHz, 60 kHz and 100 kHz

Direct Optocoupler Connection

Built-in Frequency Jittering for Lower EMI

SPICE Models Available for Transient and AC Analysis

Internal Temperature Shutdown

These Devices are Pb-Free, Halogen Free/BFR Free and are RoHS Compliant