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參數(shù)資料
| 型號： | 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)： | 11/16頁 |
| 文件大小： | 437K |
| 代理商： | FAN7585 |
FAN7585
11
3. OCP Block
It also has OCP function for +3.3V,+5V,+12V outputs. The block is made up of three comparators. Pin17(IS12), pin15(IS5)
and pin13(IS33) are current sense inputs for +12V, +5V and +3.3V outputs respectively. These pins are connected to the cur-
rent sensing resistor or inductor.
Each OCP level is determined by RI resistor , so you can define over current protection level by changing RI resistor. Pin8(RI)
voltage is always 1.25V, so if you connect 62k
resistor, the reference current is 20uA(Iref1).
If the voltage drop of the sense resistor or inductor is larger than offset voltage (V
offset
= R
offset
×
5
×
Iref1), the DTC becomes
"High" after some delay(38ms at C
TUVP
=0.47uF)and the main SMPS is turned off. That means the output voltage(+3.3V,
+5V, +12V) will be ground level.
After main power is turned off at OCP and initialized by REM, if REM signal is changed from "High" to "Low", main power
becomes operational.
For example, if you want to define 5V output OCP level at 10A in the condition of equivalent resistor(Rs)= 5m
, you can
determine the offset voltage resistor(R
offset
) as following method.
- Iref1 = 1.25V / 62k
= 20uA
- V
offset
= R
S
×
5
×
Iref1 = 5m
×
10A = 50mV
- Therefore, R
offset
= 50mV / (5
×
Iref1) = 500
By the way, OCP output signal can be delayed by protection delay capacitor(C
TUVP
) and its delay time is decided by the value
of C
TUVP
.
C
*
V
If you use too small (or large) capacitor, the charging time would decrease (or increase) very much and it can cause
malfunction at the transient time. So you have to choose the reasonable delay time for system optimization by changing the
external capacitor value.
IS12
IS33
IS5
15
17
COMP1
COMP2
COMP3
13
×
5
(100uA)
Iref1=20
μ
A at RI=62k
Iref1
5
OVP Output
VS12
18
VS5
16
VS33
14
Sense Inductor
Equivalent Resistor(Rs)
5m
Roffset
(Offset Voltage Resistor)
×
(100uA)
(100uA)
5
IIref
×
5
Iref1
5
Io
T
PROT
Tuvp
----------------------------
----------------------------------
38msec
=
=
≈
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相關(guān)代理商/技術(shù)參數(shù) |
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| 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 拓撲結(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 |
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| 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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