NCP1200: PWM Controller, Fixed Frequency, Flyback, Current Mode

Housed in SO-8 or DIP-8 package, the NCP1200 represents a major leap toward ultra-compact Switch-Mode Power Supplies. Thanks to a novel concept, the circuit allows the implementation of a complete offline battery charger or a standby SMPS with few external components. Furthermore, an integrated output short-circuit protection lets the designer build an extremely low-cost AC/DC wall adapter associated with a simplified feedback scheme.With an internal structure operating at a fixed 40 kHz, 60 kHz or 100 kHz, the controller drives low gate-charge switching devices like an IGBT or a MOSFET thus requiring a very small operating power. Thanks to current-mode control, the NCP1200 drastically simplifies the design of reliable and cheap offline converters with excellent audio- susceptibility and inherent pulse-by-pulse control.When the current setpoint falls below a given value, e.g. the output power demand diminishes, the IC automatically enters the so-called skip cycle mode and provides excellent efficiency at light loads. Because this occurs at low peak current, no acoustic noise takes place.Finally, the IC is self-supplied from the DC rail, eliminating the need of an auxiliary winding. This feature ensures operation in presence of low output voltage or shorts.

Features
  • No Auxiliary Winding Operation
  • Internal Output Short-Circuit Protection
  • Extremely Low No-Load Standby Power
  • Current-Mode with Skip-Cycle Capability
  • Internal Leading Edge Blanking
  • 250 mA Peak Current Source/Sink Capability
  • Internally Fixed Frequency at 40 kHz, 60 kHz and 100 kHz
  • Direct Optocoupler Connection
  • Built-in Frequency Jittering for Lower EMI
  • SPICE Models Available for TRANsient and AC Analysis
  • Internal Temperature Shutdown
  • Pb-Free Packages are Available
Applications
  • AC/DC Adapters
  • Offline Battery Chargers
  • Auxiliary/Ancillary Power Supplies (USB, Appliances, TVs, etc.)
Design & Development Tools (3)
Document TitleDocument ID/SizeRevisionRevision Date
Flyback Current Mode Loop Compensation Design WorksheetFLYBACK DWS.XLS.ZIP (3516kB)10Dec, 2014
NCP1200 Design WorksheetNCP1200 DWS.XLS (225.0kB)0
NCP1200 Design Worksheet InstructionsEBNCP1200/D (23.0kB)0
Data Sheets (1)
Document TitleDocument ID/SizeRevisionRevision Date
PWM Controller, Fixed Frequency, Flyback, Current ModeNCP1200/D (281kB)19Apr, 2015
Application Notes (10)
Document TitleDocument ID/SizeRevisionRevision Date
A 70 W Low Standby Power Supply w/NCP120x SeriesAND8076/D (178.0kB)2
A Simple Low-Cost Non-Isolated Universal Input Off-Line ConverterAND8078/D (139.0kB)0
Conducted EMI Filter Design for the NCP1200AND8032/D (534.0kB)2
Implementing Constant Current Constant Voltage AC Adapter by NCP1200 and NCP4300AAND8042/D (63.0kB)1
Implementing the NCP1200 in Low-Cost AC/DC ConvertersAND8023/D (369.0kB)3
Implementing the NCP1200 in a 10 W AC/DC Wall AdapterAND8038/D (132.0kB)3
Offline Buck Converter with Tapped Inductor Improves PerformanceAND8318/D (100.0kB)1
Ramp Compensation for the NCP1200AND8029/D (128.0kB)1
Stability Analysis in Multiple Loop SystemsAND8327/D (213.0kB)0
Tips and Tricks to Build Efficient Circuits with NCP1200AND8069/D (139.0kB)1
Package Drawings (2)
Document TitleDocument ID/SizeRevision
8 LEAD PDIP626-05 (35.0kB)P
SOIC-8 Narrow Body751-07 (62.6kB)AK
Simulation Models (3)
Document TitleDocument ID/SizeRevisionRevision Date
NCP1200 IsSpice4 Templates.zipNCP1200ISSPICE4 (50.0kB)0
NCP1200 OrCAD Templates.zipDDTNCP1200ORCAD (69.0kB)0
NCP1200 uCap Templates.zipDDTNCP1200UCAP (286.0kB)0
Order Information
ProductStatusCompliancePackageMSL*ContainerBudgetary Price/Unit
NCP1200D100R2GActivePb-free Halide freeSOIC-8751-071Tape and Reel2500$0.4093
NCP1200D40R2GActivePb-free Halide freeSOIC-8751-071Tape and Reel2500$0.4093
NCP1200D60R2GActivePb-free Halide freeSOIC-8751-071Tape and Reel2500$0.4093
NCP1200P100GActivePb-free Halide freePDIP-8626-05NATube50$0.4467
NCP1200P40GActivePb-free Halide freePDIP-8626-05NATube50$0.4467
NCP1200P60GActivePb-free Halide freePDIP-8626-05NATube50$0.4467
Specifications
ProductTopologyControl Modefsw Typ (kHz)Stand-by ModeUVLO (V)Short Circuit ProtectionLatchSoft StartVCC Max (V)Drive Cap. (mA)
NCP1200D100R2GFlybackCurrent Mode100YesNoYesNoNo16250 / 250
NCP1200D40R2GFlybackCurrent Mode40YesNoYesNoNo16250 / 250
NCP1200D60R2GFlybackCurrent Mode60YesNoYesNoNo16250 / 250
NCP1200P100GFlybackCurrent Mode100YesNoYesNoNo16250 / 250
NCP1200P40GFlybackCurrent Mode40YesNoYesNoNo16250 / 250
NCP1200P60GFlybackCurrent Mode60YesNoYesNoNo16250 / 250
PWM Controller, Fixed Frequency, Flyback, Current Mode (281kB) NCP1200
Flyback Current Mode Loop Compensation Design Worksheet NCP1129
NCP1200 Design Worksheet NCP1203
NCP1200 Design Worksheet Instructions NCP1203
A 70 W Low Standby Power Supply w/NCP120x Series MUR160
A Simple Low-Cost Non-Isolated Universal Input Off-Line Converter 1N5924B
Conducted EMI Filter Design for the NCP1200 MBRS360P
Implementing Constant Current Constant Voltage AC Adapter by NCP1200 and NCP4300A NDD02N60Z
Implementing the NCP1200 in Low-Cost AC/DC Converters NCP1216
Implementing the NCP1200 in a 10 W AC/DC Wall Adapter MUR160
Offline Buck Converter with Tapped Inductor Improves Performance NCP1055
Ramp Compensation for the NCP1200 MUR160
Stability Analysis in Multiple Loop Systems NCP1055
Tips and Tricks to Build Efficient Circuits with NCP1200 NCP1308
NCP1200 IsSpice4 Templates.zip NCP1200
NCP1200 OrCAD Templates.zip NCP1200
NCP1200 uCap Templates.zip NCP1200
SOIC-8 Narrow Body CM1216
8 LEAD PDIP NE592
NCP1200