Current switch KR1055KT1A. Reference data
Encyclopedia of radio electronics and electrical engineering / Reference materials
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The microcircuit is a current switch with threshold control. Its switching threshold is set by selecting the resistance values of the internal zener diode and input voltage divider resistors. The device is designed in a standard plastic case KT-26 (Fig. 1); conclusions - rigid stamped tinned.
The functional diagram of the switch is shown in fig. 2.
Pinout: pin. 1 - control voltage input (base); pin. 2 - collector; pin. 3 - emitter (common output). The device is intended for use in automotive electronic equipment. Its typical switching circuit is shown in fig. 3.
Main characteristics at Tacr.av = 25±10°C
- Voltage drop across the open switch, V, no more, at a current of 20 mA and a high-level input (control) voltage of 8V ...... 0,5
- Leakage current of a closed switch, µA, no more, at an input (control) voltage of a low level of 4 V and a switching voltage of 30 V ...... 10
Limit values
- Maximum current through an open switch, mA......50
- The highest switched voltage on a closed switch, V......30
- Maximum input (control) voltage, V......35
- Dissipated power*, mW, at temperature from -60 to +25°С......500
- +85°C......250
- Operating range of ambient temperature, °C......-60...+85
* In the ambient temperature range from +25 to +85°C, the maximum allowable power must be reduced according to a linear law.
On fig. 4 shows the dependence of the voltage drop across the switch (between terminals 2 and 3) at a switched voltage of 10 V on the control voltage, and in fig. 5 - voltage drop on the open switch (residual voltage) from the current through it.
The input characteristic of the switch is shown in fig. 6.
Current switch KR1055KT1A can be used in electronic devices for various purposes. As an example, in fig. 7 shows a fragment of the power supply circuit of most European TVs in which the TDA4605-2 chip operates. It, among other functions, provides protection for a powerful transistor (usually BUZ90A) from a supply voltage drop below 160 V - at the same time, the voltage at pin 3, taken from the resistive divider, decreases below the threshold (about 1 V) and the power supply turns off.
If this device is supplemented with a KR1055KT1A (DA1) switch with an additional voltage divider (R1R2) as shown in the diagram in Fig. 7, then when the mains voltage rises above the set value, the DA1 switch will open, the TDA4605-2 chip will work and turn off the source. Thus, after the introduction of the node circled in the diagram by a dash-dotted line, the TV's power supply will be protected from both an increase in the mains voltage and a decrease.
The response threshold is set by choosing the ratio of the resistance values of the resistors of the additional resistive divider R1R2 in accordance with the formula Unop - 6.75R1 / R2. With the ratings indicated on the diagram, this threshold corresponds to an effective mains voltage of 300 V.
Author: A.Shtyrev, Aleksandrov, Vladimir Region
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