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參數(shù)資料
| 型號(hào)： | FAN7585 |
| 廠商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)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(yè)數(shù)： | 9/16頁(yè) |
| 文件大?。?/td> | 437K |
| 代理商： | FAN7585 |
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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(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| FAN7585SN | 功能描述:電壓模式 PWM 控制器 PWM/ Secondary Combo IC RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓?fù)浣Y(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel |
| FAN7601 | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:Green Current Mode PWM Controller |
| FAN7601_05 | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:Green Current Mode PWM Controller |
| FAN7601B | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:Green Current Mode PWM Controller |
| FAN7601B_11 | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:Green Current Mode PWM Controller |
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