Parallel connection of stabilizers 142EN5. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Parallel connection of stabilizers 142EN5. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Surge Protectors

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Currently, radio amateurs widely use K142EN5A integrated stabilizers with a fixed output voltage. When designing amateur radio equipment based on transistor-transistor logic chips, in some cases the value of the output current of this stabilizer is insufficient. A good way out can be the parallel inclusion of two K142EN5A microcircuits (Fig. 8.1).

Parallel connection of stabilizers 142EN5

The operational amplifier DAI equalizes the voltage drop across the current-measuring resistors R1, R2. The output voltage of the op-amp applied to pin 8 of the DA2 microcircuit affects its operation mode in such a way that the current flowing through it will be the same as through the DA3 microcircuit. Therefore, the flow of the device is doubled. In order to prevent an increase in the output voltage during no-load operation, a ballast resistor R6 is included.

OU K140UD7 can be replaced by K140UD6 K153UD6, K157UD2. It should be noted that resistors R1 and R2 uselessly dissipate about 2 watts of power. Therefore, it is advisable to use the device described above only when it is impossible to divide the load into two parts (for example, into two groups of microcircuits) with a current consumption of not more than 3 A and power each part from a separate microcircuit, connected according to a typical circuit.

Author: Semyan A.P.

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Anti-crisis LED drivers FDL-65 from Mean Well 09.11.2016

For lighting courtyards, pedestrian areas in parks and squares, as well as other places of utility lighting, Mean Well has developed a new series of power supplies FDL-65 with an output power of 65 watts.

The features of the new series of LED drivers FDL-65 are low cost, output current stabilization mode, power factor correction (PFC; PFC), high efficiency and 3-year warranty. Power supplies are made in a metal case, filled with compound and have a degree of protection IP65.

The FDL-65 is available in two output currents of 1550mA and 1800mA, adjustable from 770-1550mA and 900-1800mA respectively. The converters are optimally suited for most LED arrays (COB) on the market for the power in question.

FDL-65 LED drivers are operable in the input voltage range of 180...295 V and temperature -40°C...+70°C, they have a set of protective measures against short circuit, overheating and overvoltage. FDL-65 allow you to create a simple and inexpensive luminaire for the needs of utility lighting that meets domestic operating conditions.

Main technical parameters of FDL-65 power supplies:

Output power 65W
Output current 1550 and 1800 mA
Output current manual adjustment range 770...550 mA and 900...1800 mA
Output voltage range 25...42 V and 21,6...36 V
Output current stabilization
KM>0,95
Efficiency=90%
Input voltage range 180...295 V
Degree of protection against external influencing factors IP65
Operating temperature range -40°С...+70°С
Dimensions (L x W x H): 151 x 53 x 31,5 mm
Manufacturer's warranty 3 years.

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