NCP1235: Controller, Fixed Frequency, Current Mode, for Flyback Converters

The NCP1235 is a new fixed-frequency current-mode controller featuring Dynamic Self-Supply (DSS). This device is pin-to-pin compatible with the previous NCP12xx families.The DSS function greatly simplifies the design of the auxiliary supply and the VCC capacitor by activating the internal startup current source to supply the controller during transients. Due to frequency foldback, the controller exhibits excellent efficiency in light load condition while still achieving very low standby power consumption. Internal frequency jittering, ramp compensation, and a versatile latch input make this controller an excellent candidate for converters where component cost is the key constraint.In addition, the controller includes a new high voltage circuitry that combines a startup current source and a brown-out detector able to sense the input voltage either from the rectified ac line or the dc filtered bulk voltage. The high voltage sensing circuitry is used for the overpower protection purposes as well. Overpower protection, overload protection, and other protective features increase the safety and reliability of the final application.

特性
  • Frequency Foldback then Skip Mode in light load and standby conditions
  • High voltage current source with brown-out detection and dynamic self-supply
  • Frequency Jittering
  • 16.0 ms Soft-Start
  • Adjustable Overpower Compensation
  • Latched Timer-Based Overload Protection
优势
  • High efficiency in light and no load conditions
  • Directly powered from the high voltage rail with integrated brown-out sensing to detect low input voltage.
  • Helps pass EMI requirements by spreading out the energy content of frequency peaks
  • Minimizes the stress on power components
  • Monitors the input voltage to limit the amount of power being delivered by the converter
  • Protects against overcurrent
应用
  • AC-DC Adapters Consumer Electronics Power Supplies Auxiliary/Housekeeping power supplies
终端产品
  • Notebooks LCD TVs Printers
数据表 (1)
Document TitleDocument ID/SizeRevisionRevision Date
Fixed Frequency Current Mode Controller for Flyback ConvertersNCP1235/D (237kB)P0
封装图纸 (1)
Document TitleDocument ID/SizeRevision
SOIC 7 CASE OUTLINE751U (62.0kB)E
产品订购型号
产品状况Compliance具体说明封装MSL*容器预算价格 (1千个数量的单价)
NCP1235AD065R2GProduct PreviewPb-free Halide freeController, Fixed Frequency, Current Mode, for Flyback ConvertersSOIC-8751U1Tape and Reel2500联系BDTIC
订购产品技术参数
ProductTopologyControl Modefsw Typ (kHz)Stand-by ModeUVLO (V)Short Circuit ProtectionLatchSoft StartVCC Max (V)Drive Cap. (mA)
NCP1235AD065R2GFlybackCurrent Mode65Yes9.5YesYesYes28500 / 500
Fixed Frequency Current Mode Controller for Flyback Converters NCP1235
SOIC 7 CASE OUTLINE NCL30060