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LS7642FO Arkusz danych(PDF) 4 Page - LSI Computer Systems |
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LS7642FO Arkusz danych(HTML) 4 Page - LSI Computer Systems |
4 / 5 page EXTENSIONS: All On / Off switching functions can be imple- mented by utilizing the EXT input. Use a pushbutton or the electronic switch in conjunction with a Touch Plate as shown in Figure 6. When the plate is touched, a logic high level is generated at the EXT input of the IC for both half-cycles of the line frequency. (See Figure 5) APPLICATION EXAMPLE: A typical implementation of the light dimmer circuit is shown in Fig. 5. Here the lamp is turned on and off by touching the touch plate. The function of different components are as follows: • The 5V DC supply for the chip is provided by Z, D1, R1, C2 and C4. • R2 and C3 generate the filtered signal for the SYNC input AC phase synchronization. • R3 and C5 act as a filter circuit for the electronic extension. If extensions are not used, the EXT input (Pin 6) should be tied to Vss (Pin 7). • R4, R5 and R6 set up the sensitivity of the SENS/ input. • R8 provides current limiting and isolation between the chip output and the triac gate. • C1 and L are RFI filter circuits. • R10, R11, R12 and C7 selects and adjusts the dimming level. C1 = 0.15µF, 200V C1 = 0.15µF, 400V C2 = 0.22µF, 200V C2 = 0.15µF, 400V C3 = 0.002µF, 10V *Component change for 220VAC **Snubber Network (See Note 5) C4 = 100µF, 10V C5 = 0.1µF, 10V C6 = 0.01uF, 10V C7 = 0.1uF, 10V R1 = 270Ω, 1/2W R1 = 1kΩ, 1W R2 = 680kΩ, 1/4W R2 = 1.5MΩ, 1/4W R3 = 1.5MΩ, 1/4W R4 = 1MΩ to 5MΩ, 1/4W (Select for Sensitivity) R5, R6 = 2.7MΩ, 1/4W R5, R6 = 4.7MΩ, 1/4W R7 = 150kΩ, 1/4W R8 = 62Ω, 1/4W R10 = 33kΩ, 1/4W R11 = 100kΩ Pot., 1/4W R12 = 16kΩ, 1/4W D1 = 1N4148 Z = 5.6V, 1W (Zener) T = Q4004L4 Typical Triac (1) T = Q5003L4 Typical Triac (1) L = 100µH (RFI Filter) L = 200µH (RFI Filter) (1) For loads greater than 6A, use an alternistor * * * * * * * EXT 10kΩ IN914 TOUCH PLATE *R 200kΩ MPS8599 FIGURE 6. ELECTRONIC EXTENSION *R P *R = 2MW for 115VAC *R = 3.6M W for 220VAC All Resistors 1/4W 7642-101308-4 FIGURE 4. TRIG/ OUTPUT CONDUCTION ANGLE, Ø The information included herein is believed to be accurate and reliable. However, LSI Computer Systems, Inc. assumes no responsibilities for inaccuracies, nor for any infringements of patent rights of others which may result from its use. ø TRIG/ SYNC TW P 115VAC OR 220VAC N LAMP C1 T L C2 R1 R2 R8 R3 C4 D1 8 7 6 5 R4 C3 TRIG/ VSS EXT SENS/ VDD BCV SYNC + LS7642 R6 R5 FIGURE 5. A Typical Halogen Lamp Dimmer Wall Switch G MT2 MT1 Z - ELECTRONIC EXTENSION (FIG. 7) EXTN P C5 SEE NOTE 3 SEE NOTE 2 R7 NOTES 1. All circuits connected by broken lines are optional. 2. C5 is used only with electronic extension and R7 is used only with pushbutton switch. 3. Connection between Pin 6 & Pin 7 should be broken when EXT is used. 4. Magnetic transformer should have thermal protection. 5. Some electronic transformers may require larger values of C2, sensitive gate triacs and snubber networks. C2 values may have to be adjusted to be as high as 0.47uF for 115VAC and 0.33uF for 220VAC. Sensitive gate triacs are chosen for their low holding current. Typical triacs are L4004L6 and L4004F51 for 115VAC and L6004L6 and L6004F51 for 220VAC applications, respectively. **C6-R9 is the snubber network: C6 = 0.1uF, 200V, R9 = 1k Ohm, 1/2W (115VAC); C6 = 0.05uF, 400V, R9 = 1k Ohm, 1W (220VAC) 6. The values selected for R10, R11, and R12 will produce the full dimming range. To reduce the maximum intensity, increase the value of R12. To increase the minimum intensity, increase the value of R10. Increasing either R10 or R12 will reduce the dimming range. R10 may have to be increased for very low wattage loads. TOUCH PLATE SEE NOTE 4 TEST 1 2 3 4 **R9 **C6 C7 R10 R11 R12 |
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