LM1949

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SNLS349C – FEB 1995 – REVISED MARCH 2013

As shown, the power dissipation by Q1 in this manner is substantially reduced. Measurements made with a

thermocouple on the bench indicated better than a fourfold reduction in power in Q1. However, the power

dissipation of the zener (which is independent of the zener voltage chosen) is increased over the circuit of

Figure 1.

Figure 22. Switching Application Circuit

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