NCP1250BSN65T1G 开关控制器 ON

NCP1250BSN65T1G

开关控制器 ACDC SWITCH OCP AUTO

Current-Mode PWM  Controller for Off-line  Power Supplies

The NCP1250BSN65T1G NCP1250 is a highly integrated PWM controller capable of  delivering a rugged and high performance offline power supply in a  tiny TSOP−6 or PDIP−8 package. With a supply range up to 28 V, the  controller hosts a jittered 65 kHz or 100 kHz switching circuitry  operated in peak current mode control. When the power on the  secondary side starts to decrease, the controller automatically folds  back its switching frequency down to a minimum level of 26 kHz. As  the power further goes down, the part enters skip cycle while limiting  the peak current.

NCP1250BSN65T1G Features

• Fixed−Frequency 65 or 100 kHz Current−Mode Control Operation

• Internal and Adjustable Over Power Protection (OPP) Circuit

• Frequency Foldback Down to 26 kHz and Skip−Cycle in Light Load Conditions

• Internal Ramp Compensation

• Internal Fixed 4 ms Soft−Start

• 100 ms Timer−Based Auto−Recovery Short−Circuit Protection

• Frequency Jittering in Normal and Frequency Foldback Modes

• Option for Auto−Recovery or Latched Short−Circuit Protection

• OVP Input for Improved Robustness

• Up to 28 V VCC Operation

• +300 mA/−500 mA Source/Sink Drive Capability

• Less than 100 mW Standby Power at High Line

• EPS 2.0 Compliant

• These are Pb−Free Devices

NCP1250BSN65T1G Typical Applications

• ac−dc Converters for TVs, Set−top Boxes and Printers

• Offline Adapters for Notebooks and Netbooks