PWM controller, 1-fold, 10 ... 450 V, SO-14

A unique input circuit allows the HV9120 to self-start directly from a high-voltage input, and subsequently take the power to operate from one of the outputs of the converter it is controlling, allowing very efficient operation while maintaining input-to-output galvanic isolation limited in voltage only by the insulation system of the associated magnetic assembly. A ±2% internal bandgap reference, internal operational amplifier, very high speed comparator, and output buffer allow production of rugged, high-performance, high-efficiency power supplies of 50 W or more, which can still be over 80% efficient at outputs of 1.0 W or less. The wide dynamic range of the controller system allows designs with extremely wide line and load variations with much less difficulty and much higher efficiency than usual. The exceptionally wide input voltage range also allows better usage of energy stored in input dropout capacitors than with other PWM ICs. Remote on/off controls allow either latching or nonlatching remote shutdown. During shutdown, the power required is under 6.0 mW.

- 10 - 450 V input voltage range
- <1.3 mA supply current
- >1.0 MHz clock
- >20:1 dynamic range @ 500 KHz
- 49% maximum duty cycle version
- Low internal noise

Technical data:
- Input voltage: 10 - 450 V
- Feedback: ±2%
- Duty cycle: 49%
- Switch: external