NCP1237BD65R2G Datasheet PDF - ON Semiconductor

●Fixed Frequency Current Mode Controller for Flyback Converters

●The NCP1237 is a new generation of the NCP12xx fixed−frequency current−mode controllers featuring Dynamic Self−Supply (DSS), pin−to−pin compatible with the previous generation.

●The DSS function greatly simplifies the design of the auxiliary supply and the VCCcapacitor by activating the internal startup current source to supply the controller during transients.

●Features

●•Timer−Based Transient Power and Overload Protections with Auto−Recovery (Option B) or Latched (Option A) Operation

●•High−Voltage Current Source with DSS with Built−in Brown−out and Line Overvoltage Protections

●•Fixed−Frequency Current−Mode Operation with Built−in Ramp Compensation

●•Frequency Jittering for a Reduced EMI Signature

●•Adjustable Overpower Compensation

●•Latch−off Input for Severe Fault Conditions, with Direct Connection of an NTC for Overtemperature Protection (OTP)

●•Protection Against Winding Short−Circuit

●•Frequency Foldback transitioning into Soft−Skip for Improved Performance in Standby

●•65 kHz Oscillator (100 kHz and 133 kHz Versions Available Upon Request)

●•VCCOperation up to 28 V

●•Increased Precision on Critical Parameters

●•±1.0 A Peak Drive Capability

●•4.0 ms Soft−Start

●•Internal Thermal Shutdown with Hysteresis

●•These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS Compliant

●Typical Applications

●•ac−dc Adapters for Notebooks, LCD, and Printers

●•Offline Battery Chargers

●•Consumer Electronic Power Supplies

●•Auxiliary/Housekeeping Power Supplies