Voltage stabilizer 10 In, 1 And with the field transistor with protection against overloads

the stabilizer Circuit on a target current to 1А is shown to div in drawing. Here loading is included in a chain of a collector of the regulating V6 transistor. The stabilizer is steady against the increased temperatures and is well protected from overloads. Factor of stabilization 240 (at a loading current 0,5А), target resistance of 0,08 Ohm (in the range of a current of loading 0,02... 0,5 And), within change of a current of a current of loading 0,5... 1 And, target resistance about 0,03 Ohms. Factor of suppression of pulsations of 60 dB, current of short circuit 60 мА.

the Exemplary tension removed from a stabilitron of V5, is compared on the V7 transistor to target tension. The collector current of the V7 transistor bearing information on result of comparison, is operating current of the V6 transistor. Thanks to that the V6 transistor is switched on according to the circuit with the general emitter, the factor of strengthening in a loop of negative feedback turns out quite big that allows to receive good target characteristics. Stabilization of tension is improved at the expense of a food of a stabilitron of V5 from a source of a stable current on the field V2 transistor. The V1 diode serves for creation small (about 0,7 In) the closing tension attached to base of the V6 transistor through the R1 resistor. This diode provides reliable closing of the regulating transistor even at the most admissible temperature of its case (+45 ^about C). Basic elements of the device of protection of the stabilizer from overloads on a vykhldny current are the V9 transistor and the sensor of a current of V8R5 on which the overload signal is allocated. Existence of the sensor of a current almost does not worsen target parameters of the stabilizer since the signal of OOS acts in film after the current sensor.