+V
15
10kΩ
10kΩ
3
5kΩ
23
e1
2
V =
e1 =12V
e2 =12V
11
9, 12
10
ISO
120
21
22
4
24
16
–V
Charge/Discharge Control
Control
Section
+V –V
e49 =12V
e50 =12V
+V
7
4
3
5kΩ
23
21
15
25kΩ
25kΩ
11
10
ISO
120
10kΩ
5
6
2
9, 12
22
24
4
16
–V
10kΩ
INA105
25kΩ
25kΩ
e50
3
V =
2
1
FIGURE 10. Battery Monitor for a 600V Battery Power System.
11
3
5
6
4
10
8
7
1mA
1mA
+VS = 15V on PWS740
RS
XTR101
150Ω
0.01µF
7
RL
250Ω
3
2
3
5
RTD
(PT100)
6
23
21
250Ω
INA105
11
9
R1
100Ω
VOUT
10
ISO
120
1
R2
4
2.5kΩ
22
4
24
2mA
Sync
Gnd
–VS = –15V
NOTE: Some ISO120 connections left out for clarity.
on PWS740
FIGURE 11. Isolated 4-20mA Instrument Loop. (RTD shown).
13
ISO120/121
BB [ BURR-BROWN CORPORATION ]
