Switched-mode power supply control circuit
US5721674A · kind A · utility
0Cited by
8References
12Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 13, 1996 |
| Grant date | Feb 24, 1998 |
| Priority date | — |
| Expiry date | Sep 13, 2016 |
Classification
- Technology area (CPC —)General
Abstract
A controller for a switch mode power supply includes an undervoltage protection circuit responsive to an input supply voltage indicative signal. The input supply voltage indicative signal is also coupled to a foldback point correction circuit. The correction circuit causes a decrease in a maximum duty cycle of a control signal when the input supply voltage increases and is still smaller than a predetermined magnitude. A zener diode limits the input supply voltage indicative signal in a manner to prevent a further decrease in the duty cycle when the input supply voltage exceeds the predetermined magnitude.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.