The NCP1072/NCP1075 products integrate a fixed frequency current mode controller with a 700 V MOSFET. Available in a PDIP−7 or SOT−223 package, the NCP1072/5 offer a high level of integration, including soft−start, frequency−jittering, short−circuit protection, skip−cycle, a maximum peak current set point, ramp compensation, and a Dynamic Self−Supply (eliminating the need for an auxiliary winding).

Features• Built−in 700 V MOSFET with RDS(on) of 11 Ω
• Large Creepage Distance Between High−voltage Pins
• Current−Mode Fixed Frequency Operation – 65 / 100 / 130 kHz (NCP1072 130 kHz on demand only)
• Peak Current: NCP1072 with 250 mA and NCP1075 with 450 mA
• Fixed Ramp Compensation
• Skip−Cycle Operation at Low Peak Currents Only: No Acoustic Noise!
• Dynamic Self−Supply: No Need for an Auxiliary Winding
• Internal 1 ms Soft−Start
• Auto−Recovery Output Short Circuit Protection with Timer−Based Detection
• Auto−Recovery Overvoltage Protection with Auxiliary Winding Operation
• Frequency Jittering for Better EMI Signature, Including Frequency Foldback Mode
• No Load Input Consumption < 50 mW
• Frequency Foldback to Improve Efficiency at Light Load
• Internal Temperature Shutdown
• These are Pb−Free Devices

Typical Applications• Auxiliary / Standby Isolated Power Supplies White Goods / Smart Meter / E−Meter

Manufacturer	onsemi
Product Category	AC DC Converters, Offline Switchers
Series	NCP1072
Type	Current Mode PWM Controllers
Packaging	Alternate Packaging
Unit-Weight	0.006632 oz
Mounting-Style	SMD/SMT
Package-Case	TO-261-4, TO-261AA
Operating-Temperature	-40°C ~ 125°C (TJ)
Mounting-Type	Surface Mount
Supplier-Device-Package	SOT-223 (TO-261)
Watt	19W
Number-of-Outputs	1 Output
Output-Isolation	Isolated
Internal-Switch-s	Yes
Voltage-Breakdown	700V
Topology	Flyback
Voltage-Start-Up	8.2V
Voltage-Supply-Vcc-Vdd	6.3 V ~ 10 V
Duty-Cycle	68%
Frequency-Switching	65kHz
Fault-Protection	Current Limiting, Over Load, Over Temperature, Over Voltage, Short Circuit
Control-Features	-
Isolation	Isolated
Output-Current	250 mA
Switching-Frequency	65 kHz
Package-Case	SOT-223
Duty-Cycle-Max	72 %