參數(shù)資料
型號(hào)： KA3511
廠(chǎng)商： FAIRCHILD SEMICONDUCTOR CORP
元件分類(lèi)： 穩(wěn)壓器
英文描述： PC POWER SUPPLY DESIGN WITH KA3511
中文描述： 0.2 A SWITCHING CONTROLLER, 10 kHz SWITCHING FREQ-MAX, PDIP22
封裝： 0.400 INCH, DIP-22
文件頁(yè)數(shù)： 14/28頁(yè)
文件大?。?/td> 233K
代理商： KA3511
14
Rev C, November 1999
6.7 REMOTE ON/OFF & DELAY BLOCK
Figure 9. 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 Rpull.
When Remote ON/OFF is high, it produces PWM (Pin6) “High” signal after ON delay time (about
8ms) 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) 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.
ON/OFF delay Time can be calculated by following equation.
(K1, K2: Constant value gotten by test)
In above equation, 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 remote High. Because PWM maintains low sta-
tus and main power turns on for on delay time. So you should use 0.1uF or smaller capacitor.
6
5
12
Rpull
5V
COMP6
COMP
PG
Block
Remote On/Off
REM
Q1
Q2
Ion/Ioff
Ion
Trem
Trem
0.1uF
+
2.2V
0.6V
1.8V
B
C
Vref
PWM
REM
Ton
Toff
Ton
K
1
--------------------------------------
Ion
0.95
F
23
A
-----------------------------
×
≈
×
= 8.2msec
=
Toff
K
2
---------------------------------------
Ioff
0.8
----------------------------------
8
μ
A
×
≈
×
= 24msec
=
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KA3524 功能描述:DC/DC 開(kāi)關(guān)控制器 SMPS Controller RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開(kāi)關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK
KA3525A 功能描述:DC/DC 開(kāi)關(guān)控制器 SMPS Controller RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開(kāi)關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK
KA3525A 制造商:Fairchild Semiconductor Corporation 功能描述:CONTROLLER IC 制造商:Fairchild Semiconductor Corporation 功能描述:IC, SMPS CONTROLLER, 16-DIP
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