Description:

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.

NCP1200D100R2G PWM Current-Mode Controller for High-Power Universal Off-Line Supplies 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
 Pb-Free Packages are Available

Application:

AC-DC Adapters
 Offline Battery Chargers
 Auxiliary/Ancillary Power Supplies (USB, Appliances, TVs, etc.)

Package included:

• 1 X NCP1200D100R2G PWM Current-Mode Controller for High-Power Universal Off-Line Supplies