1250B65 - ON Semiconductor

1250B65 Current-Mode PWM Controller

Pin N5 PDIP−8 TSSOP−6 11 62 Pin Name GND FB 8 3 OPP/OVP 5 4 CS 4 5 VCC 2 6 DRV Function − Feedback pin Adjust the Over Power Protection Latches off the part Current sense + ramp compensation Supplies the controller Driver output Pin Description The controller ground. Hooking an optocoupler collector to this pin will allow regulation. A resistive divider.

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 Li.