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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： | 12/16頁 |
| 文件大小： | 437K |
| 代理商： | FAN7585 |
FAN7585
12
4. Remote On/Off & Delay Block
Remote On/Off section is controlled by a microprocessor. If a high signal is supplied to the Remote On/Off input(Pin6), the
output of COMP6 becomes high status. The output signal is transferred to ON/OFF delay block and PG block.
If no signal is supplied to Pin6, Pin6 maintains high status(=5V) for pull-up resistor, Rpull.
When Remote On/Off is high, it produces PWM(Pin6) "High" signal after ON delay time (about 8ms with C
TREM
=0.1uF) for
stabilizing system. Then, all outputs (+3.3V, +5V, +12V) are grounded.
When Remote On/Off is changed to "Low", it produces PWM "Low" signal after Off delay time (about 24ms with
C
TREM
=0.1uF) for stabilizing the system. If REM is low, then PWM is low. That means the main SMPS is operational. When
REM is high, PWM is high and the main SMPS is turned off.
Remote On/Off delay time can be calculated by following equation.
k1, k2: constant value gotten by test
In above equation, a typical capacitor value is 0.1uF. If the capacitor is changed to larger value, it can cause malfunction in
case of AC power on at "REM=High". Because PWM maintains Low status and main power turns on for on delay time. So
you should use 0.1uF or smaller capacitor.
Ioff = Irem - Ion
Von=2V,
Voff=2.1V
Ion+Ioff
2.2V
0.6V
1.8V
COMP
Trem
0.1uF
Ion
Irem
Q1
Q2
A
C
B
5
Trem
COMP6
12
Vref
PG
Block
1.25V
6
REM
5V
Rpull
Remote On/Off
Ton
Toff
REM
PWM
Ton
K1
C
---------------------------------------
Von
×
Ion
×
×
0.95
≈
23uA
-----------------------------
×
8msec
=
=
Toff
K2
C
----------------------------------------
Voff
×
0.8
≈
----------------------------------
×
24msec
=
=
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相關代理商/技術參數 |
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