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NCP1028: High Voltage Switching Regulator for Offline SMPS

Datasheet: High-Voltage Switcher for Medium Power offline SMPS featuring low standby power
Rev. 3 (485kB)
Product Overview
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The NCP1028 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.
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.
Features   Benefits
  • Skips cycles on low power demand
  • Provides improved efficiency at light loads
    No acoustic noise
  • Short circuit protection independent of the AUX winding
  • Efficient protective circuitry
    Ease the design
  • Overpower protection
  • Effect of the input voltage variation on the max power delivered is compensated
  • Built-in 700 V MOSFET with Typical RDS(on) of 5.8 , Tj = 25C
  • Fixed Peak Current of 800 mA
  • Internal Current Source for Clean and Lossless Startup Sequence
  • 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
  • Medium Power AC-DC power supply for CE apparatus
Applications   End Products
  • Medium Power AC-DC Adapters for Chargers
  • Auxiliary power supply
  • Desktop PC
  • Flat TVs
  • DVD, STB
Budgetary Price/Unit
Case Outline
NCP1028P065G Active, Not Rec
Halide free
NCP1028 PDIP-7 626A-01 NA Tube 50 $0.6227
NCP1028P100G Active, Not Rec
Halide free
NCP1028 PDIP-7 626A-01 NA Tube 50 $0.7352
Market Leadtime (weeks) : 8 to 12
Market Leadtime (weeks) : 2 to 4
ON Semiconductor   (2020-09-02 00:00) : 2,300
PandS   (2020-09-14 00:00) : <1K
Case Outlines
NCP1028: High Voltage Switching Regulator for Offline SMPS
NCP1028: High Voltage Switching Regulator for Offline SMPS
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