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參數(shù)資料
| 型號： | U490B |
| 英文描述： | One-Shot Phase Control |
| 中文描述： | 一次性相位控制 |
| 文件頁數(shù)： | 2/6頁 |
| 文件大?。?/td> | 84K |
| 代理商： | U490B |
U490B
TELEFUNKEN Semiconductors
Rev. A1, 29-May-96
2 (6)
Pin Description
1
2
3
4
5
6
7
8
NC
Trigger
Sync.
GND
V
S
Ramp
Output
Contr
Pin
1
2
3
4
5
6
7
8
Symbol
NC
Trigger
Sync.
GND
Contr
Ramp
Output
V
S
Function
Not connected
Triggering
Synchronization
Ground
Control input
Ramp
Output
Supply voltage
Supply, Pin 8
Internal voltage limiter enables a simple supply from the
mains via series resistor R
1
.The supply voltage between
Pin 8 (V
S
) and ground (Pin 4) builts up via R
1
and is
smoothed by the capacitor C
1.
Series resistor R
1
can be calculated as follows:
0.85 xV
mains
– V
Smax
2 x I
tot
R
1max
where
V
mains
V
Smax
I
tot
I
Smax
I
X
Mains supply voltage
Maximum supply voltage
I
Smax
I
X
Maximum current consumption of the IC
Current consumption of the
external components
Phase Control, Pins 3, 5 and 6
The circuit is synchronized with mains supply through
Pin 3. As long as the switch S
1
is open, the circuit is in
wait state i.e., the capacitor C
6
(150 nF) is discharged and
is kept in this state (High level). When the switch S
1
is
closed, there is a current flow in Pin 2 which is evaluated
by the circuit. If this current flows after the elapse of delay
time, then the phase control is released. Capacitor, C
6
, is
then charged with I
6
100 A towards ground. At the
same time, there is a current flow of
which results in voltage drop across resistor R
5
. Control
voltage, V
5
, is then 1.5 V lower internally.
The output stage is released when the ramp voltage V
6
is
equal to (V
5
1.5 V). When the voltage difference is
150 mV, it is again turned–off.
100 A into Pin 5,
The result is an output pulse, whose phase shift to the zero
crossing of mains voltage is determined by the resistor R
5
at control input Pin 5 (see fig. 2). Capacitor C
6
is charged
to a value of
1.5 V. It remains there till the switch S
1
again opens and the repetition delay time is over.
The circuit is released, when four periods of the line volt-
age have expired after build up of the operating voltage,
before the switch S
1
is closed.
closed
open
V
8
V
8
S
1
V
(Sync.)
V
2
(Trigger)
V
(Ramp)
(Output)
0
50 ms
100 ms
t
1
150 ms
200 ms
t
V
6
V
7
t
150 mV
”X”
”X”
95 10867
V
5
– 1.5 V
V
t
p
Figure 2. Signal characteristics
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| U490B-FP | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Phase Control Circuit |
| U490B-MFPG3 | 功能描述:IC PHASE CONTROL ONE-SHOT 8-SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 電源管理 - 專用 系列:- 應(yīng)用說明:Ultrasound Imaging Systems Application Note 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:37 系列:- 應(yīng)用:醫(yī)療用超聲波成像，聲納 電流 - 電源:- 電源電壓:2.37 V ~ 6 V 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:56-WFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:56-TQFN-EP（8x8） 包裝:管件 |
| U4922 | 功能描述:開關(guān)配件 Switch Hardware RoHS:否 制造商:C&K Components 類型:Cap 用于:Pushbutton Switches 設(shè)計(jì)目的: |
| U49-30-18 | 制造商:UNITED STATES CRYSTAL CORP 功能描述: |
| U4930B-A | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:TV/Video Signal Processor |
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