參數(shù)資料
型號: U2102B
英文描述: Multifunction Timer
中文描述: 多功能定時器
文件頁數(shù): 4/16頁
文件大小: 205K
代理商: U2102B
U2102B
TELEFUNKEN Semiconductors
Rev. A1, 30-May-96
4 (16)
Power Supply, Synchronization Pins 15 and 16
The voltage limitation circuit contained in the U2102B
enables simple power supply via a dropping resistor R
1
.
In the case of dc loads, practically all the supply current
flows into Pin 16 (the pull down resistor at Pin 16 is neces-
sary in order to guarantee reliable synchronization) and
is supplied via an internal diode to Pin 15, where the resul-
tant supply voltage is limited and smoothed by C
1
. As a
result, the rectified and divided line voltage appears at
Pin 16, where the amplitude is limited. The power supply
for the circuit can be realized in all modes for dc loads as
shown in figure 3. The voltage at Pin 16 is used to
synchronize the circuit with the mains and generate the
system clock required for the buffers. The circuit detects
a “zero crossing” when the voltage at Pin 16 falls below
an internal threshold of approximately 8 V.
Voltage
limitation
Push
pull
Sync.
16
15
14
13
GND
+V
S
R
1
=R
sync
R
G
V
mains
Load
IGBT
R
sh
C
1
95 9882
Temp.
monit.
Figure 3. Power supply for dc loads (R
1
is identical with R
sync
)
R
1
is calculated here as follows:
R
1max
0.85
V
Nmin
–V
S
I
tot
(1)
where:
V
Nmin
=
V
S
V
mains
– 15%
Supply voltage
=
I
tot
=
I
Smax
+ I
x
I
Smax =
Max. current consumption of the IC
I
x
=
Current consumption of the external
components
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