发明名称 |
Constant current and voltage controller in a three-pin package with dual-use power pin |
摘要 |
A flyback converter includes a controller integrated circuit (IC) housed in an IC package with only three terminals. An inexpensive TO-92 transistor package can be used. A switch terminal is coupled to an inductor switch that is turned on by a switch control signal having a frequency and a pulse width. The inductor switch controls the current that flows through a primary inductor of the flyback converter. The controller IC adjusts the frequency in a constant current mode such that output current remains constant and adjusts the pulse width in a constant voltage mode such that output voltage remains constant. A power terminal receives a feedback signal that is derived from a voltage across an auxiliary inductor of the flyback converter. The feedback signal provides power to the controller IC and is also used to generate the switch control signal. The controller IC is grounded through a ground terminal.
|
申请公布号 |
US7911814(B2) |
申请公布日期 |
2011.03.22 |
申请号 |
US20080156379 |
申请日期 |
2008.05.30 |
申请人 |
ACTIVE-SEMI, INC. |
发明人 |
TAO ZHIBO;KUNST DAVID;HUYNH STEVEN |
分类号 |
H02M3/335 |
主分类号 |
H02M3/335 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|