U4078B
TELEFUNKEN Semiconductors
Tone Ringer Interface with DC/DC Converter
Description
The tone ringer interface with dc/dc converter U4078B is takes place at Pin 5 either with inductive or opto-coupler
an integrated circuit realized in bipolar technology, which mode.
allows high efficient power transfer. Galvanic separation
Features
Benefits
Suitable for the specification:
High efficient power transfer
FTZ, 1TR2 and ETR2
Rectifier bridge
Z-diode
Amplitude detection
Detection of ringing signal i.e.,
sine-, triangle-, or rectangular (tone ringing) signal
High-voltage bipolar technology
Compact surface mount package (SO8)
22 F
output
V
B
2
1.5 k
1
8
a
a
5
Hysteresis and
power supply
Pulse
shaping
38 kHz
C supply
2f
b
ST
b
1
F
7
3
6
OSC
4
GND
MS
TH
47 pF
180 k
92 7460 e
Figure 1. Block diagram with external circuit
14.04.94
1
TEMIC [ TEMIC SEMICONDUCTORS ]
