PWM Controller
Description
NCP1218
PWM Controller with Adjustable Skip Level and External Latch Input
The NCP1218 represents a new, pin to pin compatible, generation of the successful 7−pin current mode NCP12XX product series.
The controller allows for excellent standby power consumption by use of its adjustable skip mode and integrated high voltage startup FET.
Internal frequency jittering, ramp compensation, timer−based fault detection and a latch input make this controller an excellent candidate for converters where ruggedness and component cost are the key constraints.
The Dynamic Self Supply (DSS) drastically simplifies the transformer design in avoiding the use of an auxiliary winding to supply the NCP1218.
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 can be directly connected to the high voltage dc rail.
Features
• Fixed−Frequency 65 kHz Current−Mode Operation with Ramp
Compensation
• Dynamic Self Supply Eliminates the Need for an Auxiliary Winding • Timer−Based Fault Protection for Improved Overload Detection • Cycle Skip Reduces Input Power in Standby Mode • Latched Overload Protection • Internal High Voltage Startup Circuit • Accurate Current Limit Detector (±5%) • Adjustable Skip Level • Latch Input for Easy Implementation of Overvoltage and
Overtemperature Protection
• Frequency Modulation for Softened EMI Signature • 500 mA/800 mA Peak Source/Sink Current Drive Capability • Pin to Pin Compatible with the Existing NCP12XX Series • These Devices are Pb−Free and Halogen Free/BFR Free*
http://onsemi.
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SOIC−7 D SUFFIX CASE 751U
MARKING DIAGRAM 8 1218AZ ALYW G 1
1218A= Specific Device Code Z = Frequency= (6 = 65 kHz) A = Assembly Location L = Wafer Lot Y = Year W = Work Week G = Pb−Free Package
PIN CONNECTIONS
Skip/latch FB CS
GND
1 (Top View)
HV
VCC DRV
Typical Applications
• AC−DC Adapters for Notebooks, LCD Monitors • Offline Battery Chargers • Consu...
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