Switching step-down stabilizer on the LT1074 chip. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Surge Protectors
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More and more radio amateurs for work in the field are using car DC power for computers, transceivers, including MP3 players and other electrical equipment necessary for the trip. Since 5-volt ICs and peripheral devices are the most consuming in digital circuits, the simplest solution in the form of a conventional linear "quenching" voltage regulator at currents of 5 ... 10 A is extremely wasteful. Therefore, in such cases, it is better to use a switching step-down regulator.
A diagram of such a device on the LT1074 IC from Linear Technology is shown in fig. 5.36.
The stabilizer has two output voltages: 5 V with a load current of 5 A and 10 V with a load current of 2 A. The efficiency of a pulsed step-down stabilizer is about 90%, it does not have any features.
To generate a voltage of 10 V with a current of 2 A, you can use a linear regulator with a small voltage drop. It normally stabilizes the output voltage of 10 V with an input of 10,4 V and a load current of 2 A and is made on transistors VT1 ... VT7. In it, VT2 performs the function of protection against current overloads, capacitors C11 and C13 improve the impulse response.
Author: Semyan A.P.
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