Dimmer on the chip K145AP2. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Dimmer on the chip K145AP2. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Lighting. Control schemes

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This device is designed for smooth adjustment of the brightness of LEDs with one button control without fixation. The device is built on the K145AP2 chip. This chip is designed to create electronic touch dimmers with control of all functions using a single sensor. To turn on, turn off and set the required brightness of the lighting, a signal is used from the sensor or from an external control device.

Structural diagram K145AP2 is shown in Fig.1. The microcircuit is produced in a flat plastic DIP-16 package (Fig. 2a), the pinout is shown in Fig. 2b, and the pinout is in the table.

Dimmer on the chip K145AP2

The scheme of the device is shown in Fig.3.

Dimmer on the chip K145AP2

When you press the SB1 button, the HL1...HL15 LEDs start to glow at minimum brightness. If the button is held down for more than 0,5 s, the brightness of the glow changes cyclically from minimum to maximum. When the button is released, the adjustment process stops and the set brightness is saved. Thus, you can choose the desired illumination.

A pulse generator is built on the elements of the DD1 chip. These pulses are fed to the CF input (pin 2) of the DA1 chip and start the internal oscillator of the chip. The parametric stabilizer R3-VD1 generates a voltage of 12 V to power the DD1 chip.

The circuit uses MLT-0,25 resistors, capacitors C1 ... C4 - type K10-17, C5 - K50-35. Button SB1 - any small-sized (non-latching). Transistor VT1 must be provided with a small heat sink ("flag"). LEDs - white, high brightness, with a working current of 20 mA. The elements of the device are placed on a small-sized printed circuit board (Fig. 4a), the LEDs are arranged on a separate board in the form of an equilateral triangle (Fig. 4b).

Dimmer on the chip K145AP2

When soldering the DA1 chip, you must take measures to protect against static electricity. The device is powered from a stabilized source of 15 V/0,4 A.

Author: A. Levashov, Kizlyar, Dagestan

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Comments on the article:

Andrey Smorodin
I think that this chip can be used in the equalizer. Use OED instead of LEDs. And they, in turn, adjust the levels in the equalizer bands. You just need to raise the frequency at the CA input to ultrasonic to prevent the signal from being modulated by the frequency of the clock generator. Of course, filter...

But it's just an idea. [roll]

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