U4078B Datasheet, PDF (3/5 Pages) TEMIC Semiconductors – Tone Ringer Interface with DC/DC Converter

TELEFUNKEN Semiconductors
U4078B
15W
25W
2 kV
10 mF
110W
0.22 mF
a
Tone ringing
Figure 1
b
Figure 2
93 7575 e
Absolute Maximum Ratings
Reference point Pin 7, unless otherwise specified
Parameters
Supply current
Pin 1, 8
Ambient temperature range
Storage temperature range
Power dissipation
T_amb = 60°C
Junction temperature
Symbol
Value
Unit
I_s
50
mA
T_amb
– 10 to + 60
°C
T_stg
–40 to + 125
°C
P_tot
360
mW
T_j
125
°C
Thermal Resistance
Junction ambient
Parameters
Symbol
R_thJA
Value
180
Unit
K/W
Electrical Characteristics
Reference point Pin 7, T_amb = – 10 to + 60°C, V_B = 15 V, unless otherwise specified
Parameters
Test Conditions / Pin
Symbol Min
Typ
Max
Supply current
f_osc = 65 to 87 kHz
Pin 1, 8 ^Is
420
500
Threshold voltage for
slope identification
Pin 3 open
V_TH
10
12.5
15
Audio impedance
f = 300 to 3400 Hz
V_1,8 = 1@5 V_rms
R
200
Internal voltage limitation
I_z = 1 mA
V_z
26
30
32
Leakage current
1. phase
2. phase
Pin 5
i₅
100
i₅
150
Base current (PNP open)
Pin 5 I_B(5)
7
10
13
Oscillator frequency range
Pin 6
f_osc
32.5
38
48.5
Duty-cycle
Pin 6
0.67
1
Interrupted (pause) time
of the output signal
32/f_clock
Unit
µA
V
kΩ
V
µΑ
µΑ
µA
kHz
3