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LS7237 Datasheet(PDF) 4 Page - LSI Computer Systems |
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LS7237 Datasheet(HTML) 4 Page - LSI Computer Systems |
4 / 4 page 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, Modes 1 and 2. Use 1/4W for Mode 0 and Connection B, all Modes. 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, Modes 1 and 2. Use 1/4W for Mode 0 and Connection B, all Modes. NOTES: 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 VDD EXT SENS VSS MODE CAP SYNC + SEE NOTE 3 LS7237 R6 R5 FIGURE 5. A Typical Lamp Dimmer G Z - ELECTRONIC EXTENSION (FIG. 6) EXTN P C7 SEE NOTE 4 SEE NOTE 2 R7 C6 TOUCH PLATE MT2 MT1 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) Use Connection A when Neutral is not available. Use Connection B when Neutral is available. 4) Connection between Pin 6 and Pin 7 should be broken when EXT is used. (1) 115V 220V 7237-041597-4 APPLICATION EXAMPLES: 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, C5. • R2 and C4 generate the filtered signal for the SYNC input for syn- chronizing the internal PLL with the line frequency. • R3 and C7 act as filter circuit for the electronic extension. If exten- sions 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 un- changed for a period up to 1 sec. For longer power interruptions, the output is shut off. EXTENSIONS: All switching and dimming functions can also be implemented by utilizing the EXT input. This can be done by either a mechanical switch or the electronic switch in conjunction with a Touch Plate as shown in Figure 6. When the plate is touched, a logic high lev- el is generated at the EXT input of the IC for both half-cycles of the line frequency. (See Figure 5) EXTN 2K Ω ,1/4W IN914 TOUCH PLATE *R 200K Ω ,1/4W MPS8599 FIGURE 6. ELECTRONIC EXTENSION P *R *R = 2MΩ, 1/4W for 115VAC *R = 3.6MΩ, 1/4W for 220VAC (2) (3) (4) |
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