NCP1207APG , PWM Current−Mode Controller for Free Running Quasi−Resonant Operation
NCP1207B ,PWM Controller, Free Running Quasi-Resonant Current Mode(Quasi--Resonant operation). Due to its inherent skip cycle capability,the controller enters burst ..
NCP1207D ,PWM Current-Mode Controller for Free Running Quasi-Resonant OperationELECTRICAL CHARACTERISTICS (For typical values T = 25°C, for min/max values T = 0°C to +125°C, Max ..
NCP1207DR2 ,PWM Current-Mode Controller for Quasi-Resonant Operationfeatures:Minimum Input Voltage 180 VAC• Current−Mode Control: Cycle−by−cycle primaryMaximum Input V ..
NCP1207DR2G ,PWM Current-Mode Controller for Free Running Quasi-Resonant OperationFeatures• Free−Running Borderline/Critical Mode Quasi−Resonant OperationDMG18 HV• Current−Mode with ..
NCP1212 ,Current Mode PWM Controller for Both Forward and Flyback Converters3+5 V+5 VSS/DMAX+8 A−9 KOverload Shutdown−3 R+FB+28 A− +−R 0.5 VOVLO+−(25 V)UVLOVCC(10 V)300 nsCS ..
NJM2624AD , BRUSH LESS DC MOTOR PRE-DRIVER
NJM2625D , PWM TYPE 3-PHASE DC BRUSHLESS MOTOR CONTOROL IC
NJM2625M , PWM TYPE 3-PHASE DC BRUSHLESS MOTOR CONTOROL IC
NJM2670E3 , DUAL H BRIDGE DRIVER
NJM2700G , SRS WOW AUDIO PROCESSOR
NJM2700G , SRS WOW AUDIO PROCESSOR
NCP1207ADR2G
PWM Current-Mode Controller for Free Running Quasi-Resonant Operation
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. An internal 8.0 �s timer prevents the
free−run frequency to exceed 100 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.
The Dynamic Self−Supply (DSS) drastically simplifies the
transformer design in avoiding the use of an auxiliary winding to
supply the NCP1207A. This feature is particularly useful in
applications where the output voltage varies during operation (e.g.
battery chargers). Due to its high−voltage technology, the IC is
directly connected to the high−voltage DC rail. As a result, the
short−circuit trip point is not dependent upon any VCC auxiliary level.
The transformer core reset detection is done through an auxiliary
winding which, brought via a dedicated pin, also enables fast
Overvoltage Protection (OVP). Once an OVP has been detected, the
IC permanently latches off.
Finally, the continuous feedback signal monitoring implemented
with an overcurrent fault protection circuitry (OCP) makes the final
design rugged and reliable.
Features Free−Running Borderline/Critical Mode Quasi−Resonant Operation 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 Adjustable Skip Level Internal Temperature Shutdown Direct Optocoupler Connection SPICE Models Available for TRANsient Analysis Pb−Free Package is Available
Typical Applications AC/DC Adapters for Notebooks, etc. Offline Battery Chargers Consumer Electronics (DVD Players, Set−Top Boxes, TVs, etc.)
