Adjustable voltage stabilizers K1156ER2P and K1156ER2T. Reference data

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Adjustable voltage stabilizers K1156ER2P and K1156ER2T. Reference data

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Chip three-output voltage stabilizers K1156ER2P and K1156ER2T are designed for load current up to 1 A and inclusion in the positive wire of the power source. A characteristic feature of these devices is the ability to operate with a very small difference between the input and output voltages. So, at the maximum allowable load current, the voltage drop across the stabilizer does not exceed 1,2 V, decreasing with a decrease in the load current. This was achieved by using a composite p-n-p - npn transistor in the control element (see the diagram in Fig. 1).

Adjustable voltage stabilizers K1156ER2P and K1156ER2T

It is possible to adjust the internal reference voltage source with an accuracy of 0,5% and the threshold for limiting the load current at the stage of manufacturing the microcircuit.

The devices are equipped with built-in protection units against closing the load circuit and heating above the set temperature threshold.

Unlike stabilizers of the "Low Drop" group (with low voltage drop), in which the control element is built on the basis of a pn-p transistor and up to 10% of the input current is used to power auxiliary units, the K1156EP2P and K1156EP2T devices have their own consumed current flows through the load , increasing the efficiency of the stabilizer.

Microcircuits of the K1156EP2 series are electrical analogues of the CS5201 microcircuit and are interchangeable with the CLT1086.

K1156ER2 devices are produced in plastic cases with rigid plate tinned leads: TO-220 (KT-28) - K1156ER2P (Fig. 2) and TO-263 - K1156ER2T (Fig. 3). Both housings are exactly the same, the only difference is in the design of the leads and the heat sink flange - K1156EP2P is designed for traditional mounting, and KT1156EP2T - for surface mounting (the flange is attached to the heat sink by soldering); in all characteristics - electrical and thermal - they are identical. Pinout of microcircuits: output 1 - control; conclusions 2 and 4 - output; output 3 - input.

Main technical characteristics*

Reference voltage, V, with an input voltage ranging from the output plus 1,5 V to 7 V and a load current of 10 ... 1000 mA, the minimum ...... 1,241
maximum ...... 1,266
The instability of the output voltage at the input,%, no more, with an input voltage ranging from the output plus 1,5 V to 7 V ...... 0,2
The instability of the output voltage for the load current,%, no more, when the load current changes from 10 to 1000 mA......0,4
The minimum voltage drop across the stabilizer, V, at a load current of 1000 mA......1,2
Current through the control output, µA, not more than......100

* At a crystal temperature of +25 °C.

Parameter limits

Maximum input voltage, V ...... 12
The smallest load current, mA, at which the stabilizer remains operational ...... 2
The highest load current, A ...... 1
Threshold of limiting the output current when the output circuit is closed, A ...... 2,2 ± 0,5
Working range of ambient temperature, °C. .-40...+85
Maximum temperature of the crystal, °С......+150

As a heat sink for the stabilizer in the TO-263 (K1156ER2T) package, you can use a large printed foil pad on the board. Soldering mode of the flange to the heat sink: solder temperature - no more than 265 °C, soldering time - no more than 4 s.

Adjustable voltage stabilizers K1156ER2P and K1156ER2T

The installation requirements for the K1156EP2 series stabilizers are the same as for most similar ones. The connecting conductors must be kept as short as possible. The input and output of the microcircuit should be shunted with oxide capacitors, and the output is mandatory, and the capacitance of the capacitor should not be less than 10 microfarads. A typical switching circuit is shown in fig. 4.

To reduce the output voltage ripple, it is advisable to include a shunt capacitor between the stabilizer control output and the common wire. In this case, the capacitance of the output capacitor must be increased. So, for all cases, an aluminum capacitor with a capacity of 150 microfarads or a tantalum capacitor of 22 microfarads is suitable.

If it is necessary to ensure high performance of the stabilizer (in terms of resistance to self-excitation, stability of the output voltage and ripple level) with a minimum capacitance of the shunt capacitors, its operation should be checked under the conditions of the minimum temperature of the crystal and the environment and the maximum load current.

For reliable operation, the K1156EP2 series stabilizers do not need additional protective diodes. The current through the control pin is limited to a safe level by the built-in resistor even when a shunt capacitor is connected to that pin.

An internal protection diode between the input and output of the regulator (not shown in Figure 1) is capable of withstanding current up to 100 A for a microsecond. Therefore, only when the output capacitance exceeds 5000 uF, it is advisable to turn on an external protection diode between the input and output.

During operation, the stabilizer maintains a constant voltage of 1,25 V between the output and the control pin. The resistance of the resistor R1 (Fig. 4) is calculated based on the minimum load current of the stabilizer (2 mA). A selection of resistor R2 sets the required value of the output voltage. Since the current flowing out of the control pin is much less than the current through resistor R1, the control current is usually ignored.

If the load is removed from the stabilizer, then the greater the load current and the resistance of the supply conductors, the greater the voltage drop across them and, therefore, the worse the voltage stability at the load. So, for example, if the load is connected with a copper wire with a diameter of 1,29 mm, then at the maximum current through it (1 A), 13 mV will fall on each meter of the conductor.

In this case, the parasitic voltage drop on the negative conductor can be compensated by connecting the lower resistor R2 according to the output circuit directly to the lower load output. The voltage drop on the positive supply conductor cannot be compensated in any way. Therefore, the positive output wire of the stabilizer should be short and thick or, if it is printed, wider.

The stabilizer is equipped with two built-in safety devices. One of them monitors the load current. If it exceeds the set threshold, the protective device acts on the regulating transistor of the stabilizer, limiting a further increase in load current.

Another protective device controls the temperature of the crystal. If during operation the crystal of the microcircuit heats up to more than 150 ° C, this protective device turns off the output circuit of the stabilizer. As soon as the temperature of the crystal becomes less than 150 ° C, the stabilizer will resume operation.

On fig. 5 shows the dependence of the permissible power dissipated by the stabilizer on the ambient temperature during operation with and without a heat sink.

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