Increasing the output current of a voltage regulator IC without significantly degrading its efficiency. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Surge Protectors
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If a series transistor is used to increase the output current of a monolithic voltage regulator, then usually the efficiency of the regulator decreases due to the voltage drop at the base-emitter junction of the external transistor. The voltage loss across this additional transistor increases the difference between the input and output voltages of the circuit as a whole, thereby causing power losses.
The circuit shown in the figure increases the output current of the voltage regulator without power loss. The output pin (in this case, pin 6) of the regulator is grounded, while the internal series transistor does not affect the input-output saturation characteristics of the circuit as a whole. This shunting method allows you to maintain a small difference between the input and output voltages, corresponding to only one IC (in this case, 1,5 V).
In this regulator, the absolute minimum voltage difference is determined by the saturation of the internal current source and cannot be reduced, but it is usually large enough to prevent saturation of the external transistor. Even when using a 2N3055 transistor as a power amplifier, there is no noticeable change in the minimum difference between the input and output voltages when an external transistor or current-limiting resistor is introduced.
Author: D. Kesner; Publication: N. Bolshakov, rf.atnn.ru
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