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參數資料
| 型號： | FAN7585 |
| 廠商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分類： | 穩壓器 |
| 英文描述： | Intelligent Voltage Mode PWM IC |
| 中文描述： | 0.2 A SWITCHING CONTROLLER, PDIP24 |
| 封裝： | SDIP-24 |
| 文件頁數： | 9/16頁 |
| 文件大小： | 437K |
| 代理商： | FAN7585 |
FAN7585
9
1. OVP Block
The OVP function is simply realized by connecting Pin14, Pin16, Pin18 to each secondary outputs. R1, R2, R3, R4, R5, R6 are
internal resistors of the IC. Each OVP level is determined by resistor ratio and the typical values are 4.1V/6.4V/14.2V respec-
tively.
OVP detecting voltage for +3.3V
OVP detecting voltage for +5V
OVP detecting voltage for +12V
Especially, Pin19(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 external resistors.
OVP detecting voltage for PT
In the case of OVP, a 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. Then you can know the each OVP level as checking each output
voltage in just time that PG(Pin11) is triggered from high to low.
12V
18
PT
R101
R102
D
1.25V
R1
R2
R3
R4
R5
R6
OVP COMP
Vref=5V
SET of
R/S Latch
A
C
B
3.3V
14
5V
16
19
R102, R102
: External Components
Vo
VOVP1+3.3V
)
R1
R2
+
R2
VA
---------------------
+
Vref
4.1V
=
×
=
×
=
VOVP2+5V
)
---------------------
+
R4
VB
---------------------
+
R4
Vref
6.4V
=
×
=
×
=
VOVP3+12V
)
---------------------
+
VC
---------------------
+
Vref
14.2V
=
×
=
×
=
PT
----------------------------------
+
VD
×
----------------------------------
+
=
Vref
×
=
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相關代理商/技術參數 |
參數描述 |
|---|---|
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