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AD588
As shown in Figure 40, the AD588 is an excellent choice for the
+15V
control element in a bipolar bridge driver scheme. Transistor Q1
and Transistor Q2 serve as series-pass elements to boost the
220 ?
Q 1 =
2N3904
current drive capability to the 28 mA required by a typical
350 Ω bridge. A differential gain stage can still be required if the
7
6
4
3
bridge balance is not perfect. Such gain stages can be expensive.
Additional common-mode voltage reduction is realized by
using the circuit illustrated in Figure 41. A1, the ground sense
amplifier, serves the supplies on the bridge to maintain a virtual
R B
A1
R1
AD588
R4
A3
1
14
–
E O
+
ground at one center tap. The voltage that appears on the opposite
center tap is now single-ended (referenced to ground) and can
be amplified by a less expensive circuit.
R3
R2
R5
R6
A4
15
2
220 ?
+V S
Q 2 =
2N3906
–15V
A2
16
–V S
5
9
10
8
12
11
13
Figure 40. Bipolar Bridge Drive
+15V
220 ?
Q 1 =
2N3904
7
6
4
3
R B
R2
A1
R1
R4
R5
AD588
A3
A4
1
14
15
220 ?
Q 2 =
2N3906
AD OP-07
R1
R2
+
V OUT
–
R3
R6
2 +V S
–15V
A2
16 –V S
5
9
10
8
12
11
13
Figure 41. Floating Bipolar Bridge Drive with Minimum CMV
Rev. L | Page 18 of 20
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