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LS7232ND Datasheet(PDF) 4 Page - LSI Computer Systems |
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LS7232ND Datasheet(HTML) 4 Page - LSI Computer Systems |
4 / 5 page P 115VAC OR 220VAC N LOAD C1 T L C2 R1 R2 A B R8 R3 C5 D1 1 2 3 4 8 7 6 5 R4 C3 C4 TRIG V DD EXT SENS V SS MODE CAP SYNC + SEE NOTE 4 LS7232ND R6 R5 SEE NOTE 3 FIGURE 5. A Typical Lamp Dimmer G Z - ELECTRONIC EXTENSION (FIG. 6) EXTN P C7 SEE NOTE 5 SEE NOTE 2 R7 C6 NOTES 1) All circuits connected by broken lines are optional. 2) C7 is used only with electronic extension and R7 is used only with mechanical switch. 3) See I/O Description for MODE (Pin 2) 4) Use Connection A when Neutral is not available. Use Connection B when Neutral is available. 5) Connection between Pin 6 & Pin 7 should be broken when EXT is used. TOUCH PLATE MT2 MT1 APPLICATION EXAMPLE: A typical implementation of a lamp dimmer circuit is shown in Fig. 5. Here the brightness of the lamp is set by touching the Touch Plate. The functions of different components are as follows: • The 15V DC supply for the chip is provided by Z, D1, R1, C2 and C5. • R2 and C4 generate the filtered signal for the SYNC input for synchronizing the internal PLL with the line frequency. • R3 and C7 act as a filter circuit for the electronic extension. If extensions are not used, the EXT input (Pin 6) should be tied to VDD (Pin 7). • R4, R5, R6 set up the sensitivity of the SENS input. C6 provides noise filtering. • C3 is the filter capacitor for the internal PLL. • R8 provides current limiting and isolation between the chip output and the triac gate. • C1 and L are RF filter circuits. In the case of momentary power failure, the circuit state remains unchanged for a period of up to 1 sec. For longer power interruptions, the output is shut off. C1 = 0.15µF, 200V R4 = 1M Ω to 5MΩ, 1/4W C2 = 0.33µF, 200V (Select for sensitivity) C3 = 0.047µF, 25V R5, R6 = 2.7M Ω, 1/4W C4 = 470pF, 25V R7 = 150k Ω, 1/4W C5 = 47µF, 25V R8 = 100 Ω, 1/4W C6 = 680pF, 25V D1 = IN4148 C7 = 0.1µF, 25V Z = 15V, 1W (Zener) R1 = 270 Ω, 1W T = Q4006L4 Triac (Typical) R2 = 1.5M Ω, 1/4W L = 100µH (RFI Filter) R3 = 1.5M Ω, 1/4W (1) For Connection A. Use 0.22µF for Connection B. (2) For Connection A. Use 1/4W for Connection B. C1 = 0.15µF, 400V R4 = 1M Ω to 5MΩ, 1/4W C2 = 0.22µF, 400V (Select for sensitivity) C3 = 0.047µF, 25V R5, R6 = 4.7M Ω, 1/4W C4 = 470pF, 25V R7 = 150k Ω, 1/4W C5 = 47µF, 25V R8 = 100 Ω, 1/4W C6 = 680pF, 25V D1 = 1N4148 C7 = 0.1µF, 25V Z = 15V, 1W (Zener) R1 = 1k Ω, 2W T = Q5004L4 Triac (Typical) R2 = 1.5M Ω, 1/4W L = 200µH (RFI Filter) R3 = 1.5M Ω, 1/4W (3) For Connection A. Use 0.1µF for Connection B. (4) For Connection A. Use 1/4W for Connection B . (1) 115V 220V (2) (3) (4) EXTN 2K Ω ,1/4W IN914 TOUCH PLATE *R 200K Ω ,1/4W MPS8599 FIGURE 6. ELECTRONIC EXTENSION *R P *R = 2M Ω ,1/4W for 115VAC *R = 3.6M Ω ,1/4W for 220VAC EXTENSIONS: All switching and dimming functions can be implemented by utilizing the EXT input. This can be done by either a pushbutton switch or the elec- tronic switch in conjunction with a Touch Plate, 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) 7232ND-012703-4 |
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