Wednesday, November 14, 2012

High Current Regulator Circuit Using LM105

A circuit for a 10A regulator is shown in this circuit. A third NPN transistor has been included to get higher current. A low frequency device is used for Q3 because it seems to better withstand abuse. However, high frequency transistors must be used to drive it. Q2 and Q3 are both double diffused transistors with good frequency response. This insures that Q3 will present the dominant lag in the feedback loop through the booster transistors, and back around the output transistor of the LM105. This is further insured by the addition of C3. Here is a schematic drawing:
High Current Regulator Circuit Using LM105 High Current Regulator Circuit Using LM105

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