A Three Terminal Regulator Type Throttle

Published:2013/6/7 21:32:00 Author:muriel | Keyword: Three Terminal, Regulator Type , Throttle | From:SeekIC

The schematic above is of a Three Terminal Regulator (TTR) design based on the LM350K adjustable voltage regulator which has a 3 Amp current rating as opposed to the LM317K with a 1.5 Amp rating. The LM 350 is internally protected from current and thermal overload and can be thought of as a high current version of the LM 317. With the component values shown the circuit is designed to have and output voltage range of approximately 1.25 to 13.5 Volts when measured at the output of the regulator. The calculation on the drawing is used to determine the output voltage for given values of R1 and R2. Because these regulators have a minimum output voltage of 1.25 Volts diodes D3 and D4 will provide a voltage drop of approximately 1.4 Volts so that zero output to the track can be obtained. These diodes need to have at least a 3 amp rating The diodes D1 and D2 added to the circuit will prevent damage to the regulator during certain adverse conditions such as the output voltage being higher than the input voltage to the regulator. This can happen if this type of circuit is used as a variable power supply for an electronics test bench and without the added protection of D3 and D4. A substantial heat sink will be needed for the TTR as quite a bit of heat will be generated when drawing high current with low output voltages. For this reason this circuit is not recommended for use in hand held throttles. If the less expensive LM 317 regulator is used this circuit makes an excellent test bench power supply just leave out D3 and 4 and add a voltmeter.



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