HT7713B

HT7712B/HT7713B Touch Dimmer Features High noise immunity CMOS technology Operating voltage: 10V Line frequency: 60Hz or 50Hz. High sensitivity and stability Polarity insensitive with AC line Loading range of sense input from 0 to 1200pf Minimum peripheral components General Description The HT7712B/HT7713B is a CMOS fabricated LSI chip in an 8-lead DIP package. It is designed to control the brightness of lamps by changing the firing angles of the TRIAC through a touch sensitive input. The chip can be used either as a 3-step or a switch function dimmer. The high sensitivity and stability of the HT7712B/HT7713B ensure its high performance. The touch sensitive input can sustain very heavy capacitive loading and propagate sense through a highly resistive line. The application circuit of the HT7712B/HT7713B is very simple. Of these two chips, the HT7713B is a 3-step dimmer controller whose trigger angles are set at 17°, 86°, 121° — where 17° is the brightest, 86° the medium brightness, and 121° the darkest. The HT7712B, on the other hand, is an ON/OFF switch whose ON state is set at an angle of 17°. Pin Assignment Block Diagram 1 26th Mar ’97 www.DataSheet.in HT7712B/13B Pad Coordinates Pad No. 1 2 3 4 5 Unit : mil X –35.33 –35.33 –35.33 –35.33 30.83 Y 20.07 11.97 –21.60 –29.70 –29.70 Pad No. 6 7 8 9 10 X 35.24 35.24 35.24 –7.16 –26.33 Y 5.13 12.96 23.22 29.43 29.43 Chip size: 85 × 73 (mil)2 * The IC substrate should be connected to VDD in the PCB lay...