參數(shù)資料
型號： 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)： 12/28頁
文件大?。?/td> 233K
代理商： KA3511
12
Rev C, November 1999
6.5 OVP BLOCK
OVP function is simply realized by connecting Pin13, Pin14, Pin15 to each secondary output. R1,
2, 3, 4, 5, 6 are internal resistors of the IC. Each OVP level is determined by resistor ratio and the
typical values are 4.1V/6.2V/14.2V.
OVP Detecting voltage for +3.3V
OVP Detecting voltage for +5V
OVP Detecting voltage for +12V
Especially, pin16 (PT) is prepared for extra OVP input or another protection signal. That is, if you
want over voltage protection of extra output voltage, then you can make a function with two exter-
nal resistors.
OVP Detecting voltage for PT
In the case of OVP, system designer should know a fact that the main power can be dropped after
a little time because of system delay, even if PWM is triggered by OVP.
So when the OVP level is tested with a set, you should check the secondary outputs (+3.3V/+5V/
+12V) and PG (Pin11) simultaneously. you can know the each OVP level as checking each output
voltage in just time that PG (Pin11) is triggered from high to low.
Vref=5V
13
14
15
16
R101
R102
PT
R1
R3
R5
3.3V
5V
12V
R2
R4
R6
1.25V
D
C
B
A
OVP COMP
SET of
R/S Latch
R102, R102
: External Components
VO
V
OVP 1
+3.3V
(
)
R
--------------------
R
2
+
R
2
V
A
×
R
--------------------
R
2
+
R
2
Vref
×
4.1V
=
=
=
V
OVP 2
+5V
(
)
R
--------------------
R
4
+
R
4
V
B
×
R
--------------------
R
4
+
R
4
Vref
×
6.2V
=
=
=
V
OVP 3
+12V
(
)
R
--------------------
R
6
+
R
6
V
C
×
R
--------------------
R
6
+
R
6
Vref
×
14.2V
=
=
=
V
PT
R
------------------------------
R
+
R
102
V
D
×
R
------------------------------
R
+
R
102
Vref
×
=
=
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