onsemi NCP1249
The NCP1249 is a highly integrated high−voltage PWM controller capable of delivering a rugged and high performance offline power supply with extremely low no−load consumption. With a supply range up to 30 V, the controller hosts a jittered 65−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.| Part No. | NCP1249 |
|---|---|
| Datasheet | NCP1249 Download |
| Manufacturer |  onsemi |
| Description | High-Voltage Current-Mode PWM Controller |
| Buy | Stock & Price |
FEATURES
● High−voltage Current Source for Lossless Start−up Sequence● Remote Input for Standby Operation Control
● Automatic and Lossless X2 Capacitors Discharge Function
● 65−kHz Fixed−frequency Current−mode Control Operation with 1 X2 HV FB/REM OPP/Latch Timer VCC DRV GND NCP1249C/D (Top View) 130−kHz Excursion
● Internal and Adjustable Over Power Protection (OPP)
● +300 mA/ −500 mA Source/Sink Drive Capability Circuit
● Internal Brown−Out Protection Circuit
● Frequency Foldback down to 26 kHz and Skip−cycle in Light Load Conditions
● Adjustable Ramp Compensation
● Internally Fixed 4−ms Soft−start
● 100% to 25% Timer Reduction from Overload to Short−circuit Fault
● Frequency Jittering in Normal and Frequency Foldback Modes
● Latched OVP Input for Improved Robustness and Latched OVP on Vcc
● Up to 30 V Vcc Maximum Rating
● Extremely Low No−load Standby Power
● Option for Auto−Recovery or Latched Short−Circuit Protection
● Internal Thermal Shutdown with Hysteresis
● These are Pb−Free...
