NCP1079A: Enhanced Off line Switcher for Robust and Highly Efficient Power Supplies

The NCP1079A & NCP1079B products integrate a fixed frequency current mode controller with a 700 V MOSFET. Available in a two different pin out of the very common PDIP 7 package, it offers 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 (DSS, eliminating the need for an auxiliary winding).Unlike other monolithic solutions, the NCP1079A & NCP1079B is quiet by nature: during nominal load operation, the part switches at one of the available frequencies (65 or 100 kHz). When the output power demand diminishes, the IC automatically enters frequency foldback mode and provides excellent efficiency at light loads. When the power demand reduces further, it enters into a skip mode to reduce the standby consumption down to a no load condition.Protection features include: a timer to detect an overload or a short circuit event, Over voltage Protection with auto recovery. Ac input line voltage detection prevents lethal runaway in low input voltage conditions (Brown-out) as well as too high an input line (Ac line Over voltage Protection). This also allows an Over power Protection to compensate all internal delays in high input voltage conditions and optimize the maximum output current capability.For improved standby performance, the connection of an auxiliary winding stops the DSS operation and helps to reduce input power consumption below 50 mW at high line.

特性
  • Integrated 700 V MOSFET with RDS(on) of 2.7 Ω
  • Current-Mode Fixed Frequency Operation (65 & 100 kHz) - 130 kHz for B version only
  • Peak Current: NCP1079A/B = 1,050mA
  • Skip-Cycle Operation at Low Peak Current
  • Dynamic Self-Supply (DSS)
  • Auto-Recovery Output Short Circuit Protection with Timer-Based Detection
  • Frequency Foldback Operation
  • 300 µA No Load Power Consumption
  • Frequency Jittering (including during frequency foldback mode)
  • Adjustable Brown-out Protection and OVP
  • Over Power Protection
  • 2nd Level Current Protection
优势
  • Up to 30W output SMPS design capability
  • Ability to scale for efficiency or size
  • Adjust output current protection based on output power demand
  • Eliminate acoustic noise
  • Eliminate Aux winding
  • Provides more robust protection without worrying about the coupling of the aux winding
  • Improved efficiency at light load / Improved EMI over the entire load
  • <50mW no Load Power Consumption
  • Better EMI Signature Over the Entire Operating Range
  • Enhanced Protection Against too Low or too High Input Voltage
  • Higher Protection of the load in wide Mains Conditions
  • Protection in case of secondary diode short
应用
  • Auxiliary & Standby Power Supply
  • Major Home Appliances power supplies
  • Low to medium Power Chargers & Adapters
终端产品
  • White Goods
  • E-Meters
  • Industrial
  • Consumer Equipment Power Supply
设计和开发工具 (1)
Document TitleDocument ID/SizeRevisionRevision Date
Flyback Transformer Design ToolFLYBACK TRANSFORMER DESIGN TOOL (21.0kB)0
数据表 (1)
Document TitleDocument ID/SizeRevisionRevision Date
Enhanced Off-line Switcher for Robust and Highly Efficient Power SuppliesNCP1076A/D (434kB)0Feb, 2017
封装图纸 (2)
Document TitleDocument ID/SizeRevision
PDIP-7 (PDIP-8 LESS PIN 6)626A-01 (34.2kB)C
PDIP8 Less Pin 3626AS (34.1kB)O
产品订购型号
产品状况Compliance封装MSL*容器预算价格 (1千个数量的单价)
NCP1079AAP065GActivePb-free Halide freePDIP-7626A-01NATube50$0.7333
NCP1079AAP100GActivePb-free Halide freePDIP-7626A-01NATube50$0.7333
NCP1079BAP065GActivePb-free Halide freePDIP8 Less Pin 3626ASNATube50$0.7333
NCP1079BAP100GActivePb-free Halide freePDIP8 Less Pin 3626ASNATube50$0.7333
订购产品技术参数
ProductControl Modefsw Typ (kHz)fJitter Typ (%)Stand-by ModeRDS(ON) Typ (Ω)V(BR)DSS Max (V)IPeak (mA)HV Start-up Min (V)DSS (mA)UVLOShort Circuit ProtectionOver Power CompensationBrown-outLatch
NCP1079AAP065GCurrent Mode65YesYes2.97001050Yes9.26.5YesYesYesNo
NCP1079AAP100GCurrent Mode100YesYes2.97001050Yes9.26.5YesYesYesNo
NCP1079BAP065GCurrent Mode65YesYes2.97001050Yes9.26.5YesYesYesNo
NCP1079BAP100GCurrent Mode100YesYes2.97001050Yes9.26.5YesYesYesNo
Enhanced Off-line Switcher for Robust and Highly Efficient Power Supplies (434kB) NCP1079A
Flyback Transformer Design Tool NCP1129
PDIP-7 (PDIP-8 LESS PIN 6) NCP1077
PDIP8 Less Pin 3 NCP1079A