NCP1238
feature also dramatically reduces the risk of acoustic noise, which enables the use of inexpensive transformers and capacitors in the clamping network.
Internal frequency jittering, ramp pensation, and a versatile latch input make this controller an excellent candidate for converters where ruggedness and ponents cost are the key constraints.
In addition, the controller includes a new high voltage circuitry that bines a startup current source and a brown- out / line OVP detector able to sense the input voltage either from the rectified ac line or the dc filtered bulk voltage.
Finally, due to a careful design, the precision of critical parameters is well controlled over the entire temperature range (- 40°C to +125°C), enabling easier design and increased safety (e.g. ±5% for the peak current limit, ±7% for the oscillator). http://onsemi.
MARKING DIAGRAM
SOIC- 7 CASE 751U
38Xff ALYWX
G 1
38Xff = Specific Device Code X = A or B ff = 65, 00, or 33
A = Assembly Location L = Wafer Lot Y...
