NCP1027: High Voltage Switching Regulator for Offline SMPS

Datasheet: High-Voltage Switcher for Medium Power Offline SMPS Featuring Low Standby Power
Rev. 5 (520kB)
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The NCP1027 offers a new solution targeting output power levels from a few watts up to 15W in a universal mains flyback application. Our proprietary high-voltage technology lets us include a power MOSFET together with a startup current source, all directly connected to the bulk capacitor. To prevent lethal runaway in low input voltage conditions, an adjustable brown-out circuitry blocks the activity until sufficient input level is reached.
Current-mode operation together with an adjustable ramp compensation offers superior performance in universal mains applications.
Protection wise, a timer detects an overload or a short-circuit and stops all operations, ensuring a safe auto-recovery, low duty cycle burst operation. An integrated, auto-recovery, Overvoltage Protection permanently monitors the VCC level and temporarily shuts down the driving pulses in case of an unexpected feedback loop runaway.
Finally, a great RDS(on) figure makes the circuit an excellent choice for standby/auxiliary offline power supplies or applications requiring higher output power levels.
  • Built-in 700 V MOSFET with Typical RDS(on) of 5.8 , Tj = 25C
  • Current-Mode Fixed Frequency Operation: 65 & 100 kHz
  • Fixed Peak Current of 800 mA
  • Proprietary Skip-Cycle Operation at Low Peak Currents
  • Internal Current Source for Clean and Lossless Startup Sequence
  • Auto-Recovery Output Short Circuit Protection with Timer-Based Detection
  • Auto-Recovery Overvoltage Protection with Auxiliary Winding Operation
  • Programmable Brown-Out Input for Low Input Voltage Detection
  • Input to Permanently Latchoff the Part
  • Internal Frequency Jittering for Improved EMI Signature
  • No-Load Input Standby Power of 85 mW @ 265 Vac
  • 500 mW Loaded, Input Power of 715 mW @ 230 Vac
  • Programmable Over Power Protection
Applications   End Products
  • Medium Power AC-DC Adapters for Chargers
  • Auxiliary power supply
  • Medium Power AC-DC power supply for CE apparatus
  • Mpeg3 players
  • Flat Tvs: LCD and Plasma
  • Deskop PC, Server
  • DVD, Set Top Box
Budgetary Price/Unit
Case Outline
NCP1027P065G Active, Not Rec
Halide free
NCP1027 PDIP-7 626A-01 NA Tube 50 $0.7199
NCP1027P100G Last Shipments
Halide free
NCP1027 PDIP-7 626A-01 NA Tube 50  
Market Leadtime (weeks) : Contact Factory
PandS   (2020-09-14 00:00) : <1K
Market Leadtime (weeks) : Contact Factory
Avnet   (2020-08-19 00:00) : >1K
Case Outlines
NCP1027: High Voltage Switching Regulator for Offline SMPS
NCP1027: High Voltage Switching Regulator for Offline SMPS
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