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LS7634 датащи(PDF) 4 Page - LSI Computer Systems |
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LS7634 датащи(HTML) 4 Page - LSI Computer Systems |
4 / 4 page FIGURE 4. LS7635 TRIG, Ø vs TOUCH (SENS OR EXT) EXTENSIONS: All switching and dimming functions can be implemented 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 brightness of the lamp is set 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. 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 R1 = 270 Ω, 1/2W R1 = 1k Ω, 1W R2 = 680k Ω, 1/4W R2 = 1.5M Ω, 1/4W R3 = 1.5M Ω, 1/4W R4 = 1M Ω to 5MΩ, 1/4W (Select for Sensitivity) R5, R6 = 2.7M Ω, 1/4W R5, R6 = 4.7M Ω, 1/4W R7 = 150k Ω, 1/4W R8 = 62 Ω, 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 10k Ω IN914 TOUCH PLATE *R 200k Ω MPS8599 FIGURE 6. ELECTRONIC EXTENSION *R P *R = 2M Ω for 115VAC *R = 3.6M Ω for 220VAC All Resistors 1/4W 150º 100º 50º OFF 150º 100º 50º OFF 150º 100º 50º OFF Ø MODE Ø Ø MODE 1 Ø MODE 2 TS1 TS2 342ms SHORT SHORT SLOPE = SS SLOPE = SAA SLOPE = SBA LONG LONG LONG LONG A2 A0 A0 A1 B1 B2 A2 A2 B2 B1 A1 A2 B2 B1 A1 A0 A0 A0 A0 A2 A2 MEMORY A2 MEMORY SHORT SHORT REVERSE REVERSE SENS LONG B2 B2 B2 B2 7634/7635-090606-4 P 115VAC OR 220VAC N LAMP C1 T L C2 R1 R2 R8 R3 C4 D1 8 7 6 5 R4 C3 TRIG V SS EXT SENS V DD MODE SYNC + LS7634 / LS7635 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 mechanical 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. The sensitive gate triacs are chosen for their low holding current. Typical triacs are L4004L6 and L6004L6 for 115VAC and 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) TOUCH PLATE SEE NOTE 4 TEST 1 2 3 4 **R9 **C6 |
Аналогичный номер детали - LS7634_08 |
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Аналогичное описание - LS7634_08 |
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