11

Figure 12. Basic isolation amplifier.

Figure 11. Thermal derating curve dependence of safety limiting value

with case temperature per IEC/EN/DIN EN 60747-5-2.

Figure 13. Unipolar circuit topologies.

0

800

300

0

25

75

150

600

500

200

100

50

100

125

CNR200 fig 11

400

700

900

1000

175

-

+

-

+

-

+

-

+

A) POSITIVE INPUT

CNR200 fig 13

B) POSITIVE OUTPUT

C) NEGATIVE INPUT

D) NEGATIVE OUTPUT

LED

PD1

R1

A1

+

-

PD2

R2

A2

-

+

PD1

R1

A1

-

+

PD2

PD2

R2

A2

-

+

A) BASIC TOPOLOGY

B) PRACTICAL CIRCUIT

CNR200 fig 12

C1

R3

LED

C2