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U4078B Datasheet, PDF (1/5 Pages) TEMIC Semiconductors – Tone Ringer Interface with DC/DC Converter
TELEFUNKEN Semiconductors
Tone Ringer Interface with DC/DC Converter
U4078B
Description
The tone ringer interface with dc/dc converter U4078B is
an integrated circuit realized in bipolar technology, which
allows high efficient power transfer. Galvanic separation
takes place at Pin 5 either with inductive or opto-coupler
mode.
Features
D Suitable for the specification:
FTZ, 1TR2 and ETR2
D Rectifier bridge
D Z-diode
D Amplitude detection
D Detection of ringing signal i.e.,
sine-, triangle-, or rectangular (tone ringing) signal
D High-voltage bipolar technology
D Compact surface mount package (SO8)
Benefits
D High efficient power transfer
22 mF
1.5 kW 1
a

aȀ
b
bȀ
1 mF 8
VB
7
GND
2
Hysteresis and
power supply
3
TH
47 pF
38 kHz
Pulse 5
shaping
ST
6
4
OSC
MS
180 kW
92 7460 e
Figure 1. Block diagram with external circuit
14.04.94
output
mC supply
2f
1