NCP1237
feature also dramatically reduces the risk of acoustic noise, which enables the use of inexpensive transformers and capacitors in the clamping network.
The NCP1237 features a dual- level timer- based fault detection that controls the amount of transient peak power that the controller can deliver for a limited time.
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)....
