发明名称 |
Switched-mode power supply control circuit |
摘要 |
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.
|
申请公布号 |
US5825638(A) |
申请公布日期 |
1998.10.20 |
申请号 |
US19960713380D |
申请日期 |
1996.09.13 |
申请人 |
THOMSON CONSUMER ELECTRONICS, INC. |
发明人 |
SHUTTS, BRUCE WAYNE |
分类号 |
H02M3/28;H02M1/00;H02M1/32;H02M3/335;H04N5/63;(IPC1-7):H02M3/335 |
主分类号 |
H02M3/28 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|