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參數資料
| 型號： | U644B-FP |
| 英文描述： | Flasher, 18-m Shunt, Extremly Low Current Consumption |
| 中文描述： | 閃光器，18米分流，Extremly低電流消耗 |
| 文件頁數： | 2/6頁 |
| 文件大小： | 202K |
| 代理商： | U644B-FP |
U644B
TELEFUNKEN Semiconductors
Rev. A2, 25-Feb-97
2 (6)
Pulse
generator
GND
20 k
3.3 k
Relay
7
+V
S
49 a
4
5
K
2
K
1
K
3
C
1
R
1
2
12708
R
3
49 a
Comparator K
2
49 a
Comparator K
3
2 k
20 k
20 k
20 k
13 k
30 V
6
3
8
1
Shunt
R
4
GND
–31
+49
18 m
V
S
–49 mV
Measuring
comparator K
1
220
R
2
Figure 2. Application circuit as a car flasher without control input
Resistor R
1
, R
2
and R
3
: 1/4 Watt
R
2
for protection against continuous reversed polarity: 1 Watt
Application Note
In figure 1, the control input (Pin 6) is used to enable or disable U644B. If the ignition is switched off, the current
consumption is less than 50 A.
In figure 2, Pin 6 is bridged to Pin 2, so U644B works like U6043B. Note that the resistor values of R
2
and R
3
are
different from the U6043B (see application circuit).
Pin Description
Pin
1
2
3
4
5
6
7
8
Symbol
GND
V
S
REL
OSC
OSC
V
S
LD
SI
Function
IC ground
Supply voltage V
S
Relay driver
C
1
Oscillator
R
1
Oscillator
Supply voltage / or control input
Lamp failure detection
Start input (49a)
1
2
3
4
8
7
6
5
GND
REL
OSC
SI
LD
Vs
OSC
U644B
V
S
13297
Figure 3. Pinning
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