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Date: 5/25/04

SPX431L Precision Adjustable Shunt Regulator

© Copyright 2004 Sipex Corporation5

Figure 21. Constant Current Sink, I

Figure 22. Reference Amplifier for Isolated Feedback in

Off-Line DC-DC Converters

Figure 23. Precision High Current Series Regulator

V

Figure 24. High Current Shunt regulator

V

Figure 25. Single Supply Comparator with Temperature

Compensated Threshold. V

Q1

R2

R1

0.1%

SPX431L

R2

0.1%

R3

R1

0.1%

SPX431L

C2

C1

Isolated

Feedback

+

R3 sets feedback gain,

C1 provides feedback

compensation

Opto Isolator

R1

0.1%

SPX431L

R3

R2

0.1%

C1

R5

R4

R1

0.1%

SPX431L

R3

R2

0.1%

Q1

R2

SPX431L

R1

* Resistor values are chosen such that the effect to

I

TYPICAL PERFORMANCE CHARACTERISTICS