參數(shù)資料
型號(hào): U243B-FP
英文描述: Warning or Car-Direction Indicator
中文描述: 警告或汽車,方向指示器
文件頁(yè)數(shù): 4/6頁(yè)
文件大?。?/td> 88K
代理商: U243B-FP
U243B
TELEFUNKEN Semiconductors
Rev. A1, 05-Sep-96
Preliminary Information
4 (6)
Istable multivibrator
The figure shows the minimum of circuitry necessary for
the operation as an instable multivibrator. The circuit is
suitable for frequencies between 0.05 Hz and approxi-
mately 10 kHz. The frequency can be calculated by using
the relationship for f
1
given in circuit description. A start-
ing resistor of 3.8 k is integrated into the circuit between
pins 8 and 6. This means that, for a load on pin 3 of, for
example, 500 (open circuits) and zero current, a voltage
of about 1.4 V remains on the load (for 70
corresponding voltage is about 220 mV). A load of R
L
3.3 k on pin 3 ensures correct operation of the instable
multivibrator. The relationship between the on- and off-
periods can be changed in this circuit by inserting a
resistor-diode combination parallel to R
1
(see dashed
lines in the figure), e.g., to reduce the “bright”-time.
the
Figure 2. Flashing generator with small loads
Figure 3. Instable multivibrator for general-purpose applications
Pin Description
Pin
1
2
3
4
Function
IC ground
Supply voltage V
S
Relay driver
C
t
oscillator
Pin
5
6
7
8
Function
R
t
oscillator
Supply voltage V
S
Lamp-failure detection
Start input (49a)
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