TELEFUNKEN Semiconductors
U4078B
Time Sequence
t
= 32/f
. During interruption, the signal at
clock
Internal clock frequency without RC tolerance
pulse
ST (Pin5) is of such a value that the coil is critically
attenuated (damped).
t
During this time, a clock signal is given at
Pin 5 (ST).Pin 4 is open or ST is high ohmic.
(MS=GND)
clock
I (PNP) = I
10 µA
S
ST
A current of I
every polarity change whereby MS is grounded.
150 µA is drawn from Pin 5 (ST) by
ST
t
By every polarity change of the call signal and MS
open, the clock signal is interrupted for a time
duration
pulse
Call signal
ST
1. Phase
ST
MS = open
2. Phase
t
ST
MS = 0
92 7471 e
1
f
cycle
tcycle
tpuls
e
t
92 7461 e
Current sequence at Pin 5 with an external PNP transistor connected as shown in figure 1. (f
= 38 kHz)
clock
Ordering Information
Package
SO8
Type
U4078B-FP
Dimensions in mm
Package: SO8
4
TEMIC [ TEMIC SEMICONDUCTORS ]
