Product Overview NCP1129: High Voltage Switching Regulator for Offline SMPS For complete documentation, see the data sheet Product Description The NCP1129 switcher offers everything needed to build reliable and compact AC-DC switching power supplies with minimal surrounding elements. Incorporating an avalanche rated 650 V MOSFET, converters built with the NCP1129 can be safely designed for international conditions without jeopardizing the overall reliability. The NCP1129 implements peak current mode control with adjustable ramp compensation that ensures stability in Continuous Conduction Mode (CCM) operation. With an external resistor, the maximum peak current is adjustable, allowing the designer the ability to inject ramp compensation to stabilize CCM power supplies. A short circuit fault condition is independently detected from the auxiliary winding voltage resulting in improved short circuit protection with true overload detection. The Source pin provides access to the MOSFET source, allowing for overpower compensation. With a supply range up to 26 V, the switcher also provides a jittered 65 kHz or 100 kHz switching frequency operated in peak current mode control. When the power on the secondary side starts to decrease, the switcher automatically folds back its switching frequency down to a minimum level of 26 kHz. As the power further goes down, the part enters skip cycle while limiting the peak current. Features Benefits • 650 V Avalanche Rated MOSFET • FixedFrequency 65 or 100 kHz CurrentMode Control Operation • Frequency Foldback Down to 26 kHz and SkipCycle in Light Load Conditions • Adjustable Current Limit • 50 ms Timer-Based Auto-Recovery Short-Circuit Protection • Frequency Jittering in Normal and Frequency Foldback Modes • Option for Auto-Recovery or Latched Short-Circuit Protection • Less than 100 mW Standby Power at High Line Applications • Rugged MOSFET for robust design • Ability to scale for efficiency or size • Eliminate acoustic noise and improved efficiency at light loads • Scale for various designs 5W~20W • Provides more robust protection without worrying about the coupling of the aux winding • Improved efficiency at light load / Improved EMI over the entire load • Flexible protection options • EPS 2.0 Compliant End Products • Power Supply • Power supply for DVD, STB, CD-Player • Aux supply for TV, USB, Appliance Part Electrical Specifications Product Compliance Status Contr fsw fJitter ol Typ Typ Mode (kHz) (%) Stan RDS(O V(BR) DSS d-by N) Max Mode Typ (Ω) (V) IPeak (mA) HV DSS Start- (mA) up Min (V) UVL O Short Circu it Prote ction Over Brow Powe n-out r Com pens ation Latch Pack age Type NCP1129AP100G Pb-free Active Curre 100 nt Mode +/5% of FSW Yes 2 650 0 Yes 0 8.8 Yes No No Yes PDIP -8 Active Curre 65 nt Mode +/5% of FSW Yes 2 650 0 Yes 0 8.8 Yes No No Yes PDIP -8 Active Curre 100 nt Mode +/5% of FSW Yes 2 650 0 Yes 0 8.8 Yes No No No PDIP -8 Active Curre 65 nt Mode +/5% of FSW Yes 2 650 0 Yes 0 8.8 Yes No No No PDIP -8 Halide free NCP1129AP65G Pb-free Halide free NCP1129BP100G Pb-free Halide free NCP1129BP65G Pb-free Halide free Application Diagram For more information please contact your local sales support at www.onsemi.com Created on: 6/30/2016