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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 |
| 文件頁數(shù)： | 13/16頁 |
| 文件大?。?/td> | 437K |
| 代理商： | FAN7585 |
FAN7585
13
5. Power Good Signal Generator
Power Good Signal Generator circuit generates "ON or OFF" signal depending on the status of output voltage to prevent the
malfunctions of following systems like microprocessor, etc. caused by the output instability at power on or off .
At power on, it produces PG "High" signal after some delay time(about 260ms with C
TPG
=2.2uF) for stabilizing output volt-
age. At power off, it produces PG "Low" signal without delay time by sensing the status of power source for protecting follow-
ing systems. Vcc detection point(Pin9) can be calculated by following equation. Recommended values of R11, R12 are
determined by the following equation.
The COMP3 creates PG "Low" without delay when +5V output falls to less than 4.0V to prevent some malfunction at transient
status, thus it improves system stability.
When Remote On/Off signal is high, it generates PG "Low" signal without delay. It means that PG becomes "Low" before
main power is grounded.
PG delay time(T
PG
) is determined by capacitor value(C
TPG
), threshold voltage of COMP3 and the charging current and its
euqation is as following.
Considering the lightning surge and noise, there are two types of protections. One is a few time delay between TPG and PG for
safe operation and another is some noise margin of Pin10.
Noise_Margin_of_T
PG
= V
Pin10
(max)- Vth(L) = 2.9V - 0.6V = 2.3V
Vcc
Q2
PG
DET
Ichg
12
Vref
COMP3
0.6V
1.8V
T
PG
C
PG
2.2 uF
11
R15
1k
Q3
16
+5V
9
1.25V
COMP1
COMP2
Vref
Vref
R13
R12
R14
Remote
ON/OFF
10
R11
60k
PG COMP
4.7k
DET
1.25V
=
1
----------
+
×
17.2V
=
T
PG
C
----------------------------
V
×
Ichg
=
C
------------------------------
Vth
×
Ichg
≈
----------------------------------
15uA
=
260msec
≈
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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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