Κωδικός: NCP 1207AP

NCP1207AP P1207AP PWM CURRENT-MODE CONTROLLER ON DIP8

NCP1207A PWM Current-Mode Controller for Free Running Quasi-Resonant Operation

The NCP1207A combines a true current mode modulator and a demagnetization detector to ensure full borderline/critical Conduction Mode in any load/line conditions and minimum drain voltage switching (Quasi-Resonant operation). Due to its inherent skip cycle capability, the controller enters burst mode as soon as the power demand falls below a predetermined level. As this happens at low peak current, no audible noise can be heard. For the NCP1207A, an internal 8.0 sec timer prevents the free-run frequency to exceed 125 kHz (therefore below the 150 kHz CISPR-22 EMI starting limit), while the skip adjustment capability lets the user select the frequency at which the burst foldback takes place.

Features

·          Current-Mode with Adjustable Skip-Cycle Capability

·          No Auxiliary Winding VCC Operation

·          Auto-Recovery Overcurrent Protection

·          Latching Overvoltage Protection

·          External Latch Triggering, e.g. Via Overtemperature Signal

·          500 mA Peak Current Source/Sink Capability

·          Undervoltage Lockout for VCC Below 10 V

·          Internal 1.0 ms Soft-Start

·          Internal 8.0 s Minimum TOFF for NCP1207A, 4.5 s Minimum TOFF for NCP1207B

·          Adjustable Skip Level

·          Internal Temperature Shutdown

·          Direct Optocoupler Connection

·          SPICE Models Available for TRANsient Analysis

·          Pb-Free Packages are Available

 

Typical Applications

·          AC/DC Adapters for Notebooks, etc.

·          Offline Battery Chargers

·          Consumer Electronics (DVD Players, Set-Top Boxes, TVs, etc.)

·          Auxiliary Power Supplies (USB, Appliances, TVs, etc.)

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