Device NCP1200
PWM Current-Mode
Controller for Low-Power Universal Off-Line Supplies
Data
Sheet NCP1200/D - 132.0 (kb)
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Housed in SO-8 or DIP-8 package, the NCP1200 represents a
major leap toward ultra-compact Switch-Mode Power Supplies. Thanks
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. Thanks to
current-mode control, the NCP1200 drastically simplifies the design
of reliable and cheap offline converters with excellent audio-
susceptibility 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 so-called 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
- 110 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
Applications:
- AC/DC Adapters
- Offline Battery Chargers
- Auxiliary/Ancillary Power Supplies (USB, Appliances, TVs,
etc.)
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