Datasheet

MAX845
Isolated Transformer Driver
for PCMCIA Applications
_______________________________________________________________________________________ 9
0.1µF
ISO
GND
C1
0.1µF
5V @ 50mA
ISO OUTPUT
D1
TELEPHONE SUBSCRIBER LINE
2M
100k
1k
100k
100k
100k
680k
Q1
2N3906
Q2
2N3904
6.8V
2W
MAX845
D1
D2
FS
SD
GND1 GND2
V
CC
1
T1
1:2:1
8
3
22k
22k
N.C.
6
2 7
4
D2
1N5817
IC2
TL431
ISOLATION
BARRIER
D3
1N5817
IC1
Figure 7. 5V from Telephone-Subscriber Line
10µF
5V
MAX845
D1
D2
GND1 GND2
V
CC
1
8
6
2 7
1N5817
SD
4
1N5817
1CT:5CT
49.9k
7
6
3
2
4
7
6
3
2
4
10k
24.9Ω
2N3904
MAX480
MAX480
0.1V to 0.5V
ISO
5V
I
OUT
4mA to 20mA
78L05
4
3
2
1
5
6
24V UNREGULATED
49.9k
R
L
0k to 1k
2N3904
ISOLATION
BARRIER
V
IN
IN
GND
OUT
IL300
Figure 8. Typical 4mA/20mA Application Circuit