![]() A second current supply line 11 is connected to ground. ![]() DescriptionĪ first current supply line 10 is connected with the terminal B + of a positive supply voltage. The temperature dependency of this switch-on voltage can be adjusted by varying the resistance ratio of these two resistors (R 1, R 2). Upon the attainment of a predetermined voltage at the cathode of the Zener diode (ZD), the driver transistor (T 2) and the power transistor (T 3) are switched ON. Connected to the base of the driver transistor (T 2) is a series circuit comprising a first resistor (R 1), which is connected directly to this base, and a Zener diode (ZD), the anode of the Zener diode being connected with the resistor (R 1) and a second resistor (R 2) the second resistor (R 2) is connected in parallel to the emitter-base path of the driver transistor (T 2). The collectors of these three transistors are connected with one another, while the emitter of the driver transistor (T 2) is connected to the base of the power transistor (T 3), and the emitter of the initial transistor (T 1) is connected to the base of the driver transistor (T 2). H03K17/04126- Modifications for accelerating switching without feedback from the output circuit to the control circuit by measures taken in the control circuit in bipolar transistor switchesĪ three-stage Darlington transistor circuit having a power transistor (T 3), a driver transistor (T 2) and an initial transistor (T 1) is provided.H03K17/0412- Modifications for accelerating switching without feedback from the output circuit to the control circuit by measures taken in the control circuit. ![]()
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