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A new generation touch free speed dimming circuit using NB7232

Published on May 02 2011 // Timing control circuits

First, the circuit Overview:
NB7232 touch (touch)-free dimming (governor) / switch circuit, Ningbo Yong Jing Science and Technology Park
Second, the working principle of:
the circuit from the input buffer, PLL, control logic, memory brightness, phase angle pointer, digital comparator and output driver component. The block diagram shown in Figure A:
Chart

A new generation touch free speed dimming circuit using NB7232

C, pin arrangement and Function:
Pin Function:
1. Vss – 5V power supply.
2. Doze – dimming function. When the conduction angle of the maximum (159 °) time. Impose on the outside of the foot 83 ± 3 pulses, the SCR conduction angle from 159 ° continuous variable to 40 °, the final deadline (no output trigger pulse).
3. Cap – External PLL filter capacitor (reference value 0.47µF).
4. Syn – mains frequency synchronization signal is input.
5. Sen2 – touch control side. Low level trigger, the body touch points.
6. Sala – remote control client. High level trigger, interference, suitable for a more long-range dimming control button.
7. VDD – 0V.
8. Out – the output trigger pulse.
D, the typical application circuit
Figure I (component and load in series connection can directly replace the original lamp or a mechanical speed control switch.)
Figure II (components and load and join law, IC power supply from more stable electricity for lighting production manufacturers to adopt)

 A new generation touch free speed dimming circuit using NB7232 1

 A new generation touch free speed dimming circuit using NB7232 2

A new generation touch free speed dimming circuit using NB7232 3

Note:
1. TRIAC SCR power according to the load size selection 97A6 (about 1A), TLC336A (about 3A), BT136-500D (about 6A) a, principle of selection is less than the trigger current of 25mA.
2. C4 values \u200b\u200bin between 0.1 ~ 0.47uF, C2 value between the 2200 ~ 4700pF.
V, the main technical indicators:
Power supply voltage: 5V.
Output pulse width: 40ms.
Output trigger pulse conduction angle: 41 ° ~ 159 °.
Dimming cycle (light from the brightest to the most): 4.2s.
Supply current: 1.5 ~ 2.5mA.
Output sink current: = 25mA.
Output trigger pulse amplitude: Vss-3V.
Dimming pulse: 83 ± 3.