參數(shù)資料
型號(hào): KA3511
廠商: FAIRCHILD SEMICONDUCTOR CORP
元件分類: 穩(wěn)壓器
英文描述: PC POWER SUPPLY DESIGN WITH KA3511
中文描述: 0.2 A SWITCHING CONTROLLER, 10 kHz SWITCHING FREQ-MAX, PDIP22
封裝: 0.400 INCH, DIP-22
文件頁數(shù): 13/28頁
文件大?。?/td> 233K
代理商: KA3511
13
Rev C, November 1999
6.6 UVP BLOCK
The KA3511 has UVP functions for +3.3V, +5V, +12V Outputs. The block is made up of three input
comparators. Each UVP level is determined by resistor ratio and the typical values are 2.3V/4V/
10V.
UVP Detecting voltage for +3.3V
UVP Detecting voltage for +5V
UVP Detecting voltage for +12V
13
14
15
Vref=5V
SET of
R/S Latch
R1
R3
R5
R2
R2
R6
1.25V
A
B
C
UVP COMP
3.3V
5V
12V
V
UVP 1
+3.3V
(
)
R
--------------------
R
2
+
R
2
V
A
×
R
--------------------
R
2
+
R
2
Vref
×
2.3V
=
=
=
V
UVP 2
+5V
(
)
R
--------------------
R
2
+
R
2
V
A
×
R
--------------------
R
2
+
R
2
Vref
×
4V
=
=
=
V
UVP 3
+12V
(
)
R
--------------------
R
2
+
R
2
V
A
×
R
--------------------
R
2
+
R
2
Vref
×
10V
=
=
=
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