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| HT7704 Touch Dimmer Feature * * * * * * Operating voltage: 4~10V High noise immunity CMOS technology High sensitivity and stability Polarity insensitive with AC line Minimal external components required Loading range of sense input from 0 to 1000pf * * * 50/60 Hz selectable HT7704A: 3 steps control HT7704B: 4 steps control HT7704C: On/off switch 8 pin DIP/SOP package General Description The HT7704 series are CMOS LSIs in 8-lead DIP package. They are designed to control the brightness of an incandescent lamp by changing the triggering angles of the TRIAC with touch sense input. HT7704 is a selectable 3-step, 4-step or on/off switch function dimmer. High sensitivity and stability account for its eminent performance. The sense input can sustain very heavy capacitive loading and propagate sense through a highly resistive line. In addition, the application circuit is very simple. Pin Assignment Pad Assignment Chip size: 1640 x 1620 (m)2 * The IC substrate should be connected to VSS in the PCB layout artwork. 1 27th Dec '96 HT7704 Block Diagram Pad Coordinates Pad No. 1 2 3 4 5 6 Unit: m X -563.75 -557.25 -563.75 -198.25 171.25 604.75 Y 373 166 -91 -544 -544 -297 Pad No. 7 8 9 10 11 X 604.75 594.25 595.25 -308.25 -641.75 Y -122 230.5 544.5 573.5 573.5 Pin Description Pin No. Pin Name I/O 1 2 3 4 5 OSC ZC VDD SENSE FB I I I I I Internal Connection CMOS -- Oscillator input Description Line frequency 50Hz or 60Hz input for zero crossing Power supply (positive) Touch sense input Feedback signal to control the sink current of the SENSE pin. For 50Hz or 60Hz AC signal selection input It is connected to VSS when the AC line is 50Hz. However, when the AC line is 60Hz, it is connected to VDD. Refer to the application circuit for connection details. Power supply (negative) Trigger output to drive the TRIAC Low pulse output with a capacitor and resistors for applications 6 FSEL I CMOS 7 8 VSS TRIG1 I O -- CMOS 2 27th Dec '96 HT7704 Approximate internal connection circuit Absolute Maximum Ratings Supply Voltage ............................... -0.3V to 12V Operating Temperature................... 0C to 70C Input Voltage..................VSS-0.3V to VDD+0.3V Storage Temperature................. -50C to 125C (Ta=25C) Electrical Characteristics Symbol VDD IDD IIH IOL1 IOH1 IOL2 IOH2 VIH VIL FOSC Parameter Operating Voltage Operating Current OPT1, OPT2 Input High Current TRIG1 Sink Current TRIG1 Drive Current TRIG2 Sink Current TRIG2 Drive Current Input High Voltage Input Low Voltage Operating Frequency Test Condition VDD -- 7V 7V 7V 7V 7V 7V -- -- 7V Condition -- * VIH=7V VOL=0.7V VOH=6.3V VOL=0.7V VOH=6.3V -- -- ROSC=150K Min. 4 -- -- 0.4 -8 6 -1 0.8VDD -- -- Type 7 200 40 0.7 -14 11 -2 -- -- 400 Max. 10 400 80 -- -- -- -- -- 0.2VDD -- Unit V A A mA mA mA mA V V KHz * The test conditions are shown below: a. ZC is supplied by 60Hz/7V sinwave via 100K. b. FB is connected to VSS and SENSE, FSEL to VDD. 3 27th Dec '96 HT7704 Functional Description Selection table There are 3 types of HT7704 and the following table illustrates their operating mode: IC No. HT7704A HT7704B HT7704C Flow Chart OPT1 Open Open Bond to VDD OPT2 Open Bond to VDD Open Function 3 steps of controllable brightness 4 steps of controllable brightness On/off the light * 3 steps (for the HT7704A) * 4 steps (for the HT7704B) The first touch turns the light on at it's initial brightness level. The second touch makes the light a little brighter. The light is the brightest by the third touch. Finally, the fourth touch turns the light off. Similarly with the 4-step. The first touch tuns the light on at it's initial brightness level. The second touch makes the light brighter. The brightness increases greatly on the third touch and reaches it's brightest on the fourth touch, respectively. Finally the fifth touch switches the light off. 4 27th Dec '96 HT7704 * ON/OFF switch (for the HT7704C) The initial touch turns the light on. When touched again, the light is turned off, and so on. Timing Diagram 3 steps trigger angle (FOSC=400KHz) T RIAC turns off T RIAC (T rig er a le=120.96) g ng T RIAC turns on T RIG 1 T RIG 2 T RIAC (T rig er a le=86.4) g ng T RIG 1 T RIG 2 T RIAC (T rig er a le=17.28) g ng T RIG 1 T RIG 2 5 27th Dec '96 HT7704 4 steps trigger angle (FOSC=400KHz) T RIAC turns off T RIAC (T rigg a le=129.6) er ng T RIAC turns on T RIG1 T RIG2 T RIAC (T rigg a le=95.04) er ng T RIG1 T RIG2 T RIAC (T rigg a le=69.12) er ng T RIG1 T RIG2 T RIAC (T rigg a le=17.28) er ng T RIG1 T RIG2 6 27th Dec '96 HT7704 On/off trigger angle (FOSC=400KHz) T RIAC (T rigg a le=17.28) er ng T RIG1 T RIG2 Application Circuit Package form 7 27th Dec '96 |
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