Control circuit of switching stabilizers 1155EU1. Reference data

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Control circuit of switching stabilizers 1155EU1. Reference data

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Encyclopedia of radio electronics and electrical engineering / Application of microcircuits

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The microcircuit is designed to control powerful switching voltage stabilizers, electric drive control circuits with a switching current of up to 5 A.

The microcircuit includes: a voltage stabilizer, PWM, an error signal amplifier, a comparator, a sawtooth voltage generator, temperature and current protection units, and a power bipolar transistor.

The microcircuit is manufactured in an 8-pin glass-to-metal package type 4.106.010.

Control circuit of switching stabilizers 1155EU1. Reference data. Structural diagram of the microcircuit
Rice. 1 Block diagram of the microcircuit

The purpose of the pins of the microcircuit is presented in the table, the block diagram is shown in fig. 1, and a typical switching circuit - in fig. 2.

Electrical parameters

Residual voltage (at Ucc = 12V, Iout = 5A), V	<2
Reference voltage (at Uss = 9V), V	1,9 - 2,1
Leakage current (at U_KOM = 40 V, Ucc = 9V), mA	0,3
Consumption current (at Ucc = 36), mA	35
ION voltage instability (at Ucc = 9 V), V	<0,1%

Operating modes

Switched voltage (Ukom), V	<40
in limit mode (within 100 ms), V	<44
Supply voltage	6 36 ...
in limit mode (within 100 ms), V	6 40 ...
Static potential value, V	<500
Output current, A	<5
in limit mode (within 100 ms), A	<5,5
Dissipated power, W	<20
in limit mode, W	<22
Operating frequency, kHz	<200
Crystal temperature, °С	<150
Thermal resistance "case-crystal", °С/W	6,3
Ambient temperature, ° С	-60 ... + 125

Note: The dissipated power in the temperature range from 25 to 125°C decreases linearly by 0,16 W/°C.

Recommended Use

When mounting a microcircuit, it must be taken into account that its body is electrically connected to the common wire of its internal components.

The principle of operation of the microcircuit is based on PWM conversion of the input voltage. The output voltage of the mismatch signal amplifier (USR) is compared with the voltage of the sawtooth voltage generator G using a PWM switch. If the generator voltage does not exceed the USR voltage, then the switch output is in the log state. "0", and the key transistor is open at this time. In the process of forming the front of the sawtooth voltage, the generator generates a rectangular pulse, which is used to synchronize the PWM. During the action of the clock pulse, the key transistor is in the closed state, i.e. the leading edge of the control pulses at the output of the shaper (the base of the key transistor) coincides with the beginning of the formation of a linearly increasing section of the sawtooth voltage. This eliminates the influence of the nonlinearity of the falling section of the sawtooth voltage on the PWM parameters.

Control circuit of switching stabilizers 1155EU1. Reference data. Typical switching circuit
Rice. 2. Typical switching circuit

The input filter capacitor is recommended to be located as close as possible to the pin. 1 and 2 microcircuits, and pin. 5 shunt with a capacitor with a capacity of 0,01 ... 0,1 μF.

When using a microcircuit in circuits with a grounded emitter of a key transistor (pin 8), the value of the time-setting capacitor connected to the pin. 3, must be at least 0,025 uF.

When the temperature of the chip chip is more than 150 ° C, the temperature protection circuit is triggered. To restore the circuit's operability, it is necessary to turn off the load and briefly turn off the supply voltage (pin 2).

If the maximum permissible output current (5 A) is exceeded, the flow protection is activated. When the load is disconnected, the operation of the circuit is restored.

Publication: cxem.net

See other articles Section Application of microcircuits.

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