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LS7541 Folha de dados(PDF) 4 Page - LSI Computer Systems |
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LS7541 Folha de dados(HTML) 4 Page - LSI Computer Systems |
4 / 6 page R1 = 39kΩ, 2W R2 = 910kΩ, 1/4W R4 = 470kΩ, 1/4W, 1% D1 = 1N4005 T1 = Q4004L4 (Typical Triac) or Q4004F41 (Typical Triac) All other values remain the same. C4 = 1000pF, 1kV C5 = 0.03µF, 10V C6 = 1µF, 10V Z1 = 5.1V, 1/4W Zener D1 = 1N4004 D2 = 1N4148 D3 = 1N4148 T1 = Q2004L4 (Typical Triac) or Q2004F41 (Typical Triac) 220VAC APPLICATION 115VAC APPLICATION (1) Resistor should be placed adjacent to Pin 1. (1) (1 ) 7541-011706-4 AC MAINS LOAD C4 R1 R3 R4 C1 D1 FIGURE 4. TOUCH LAMP APPLICATION SCHEMATIC C3 D2 8 7 6 5 4 3 2 1 TRIG VSS MODE CONT CLOCK SYNC VDD TOUCH D3 R2 TOUCH PLATE (LAMP BODY) C2 T1 G MT2 MT1 Z1 C5 C6 R5 + - +V -V LS7541 + - C7* (SEE NOTE 2) R6 SEE NOTE 1 R1 = 20kΩ, 1W R2 = 470kΩ, 1/4W R3 = 1kΩ, 1/4W R4 = 400kΩ, 1/4W, 1% R5 = 10MΩ, 1/4W R6 = 100Ω, 1/4W C1 = 47µF, 10V C2 = 1000pF, 10V C3 = 1000pF, 1kV NOTE 1: Connect MODE (Pin 6) for desired Brightness Step Sequence (See Table 1). NOTE 2: A good PCB layout using through-hole components will provide protection for ESD introduced at the Touch Plate in the range of 25kV. Using surface mount components and/or a poor PCB layout can reduce the ESD protection. The OEM can increase the ESD protection provided by the product with any combination of the following steps: Step 1: The most effective and least costly way to increase ESD protection is to create a spark gap around the Touch Plate input on the PCB. This will increase ESD protection on a good PCB layout to abut 35kV. The gap should be made with a split metal ring with each side of the metal ring connected back to opposite sides of the AC line. This ensures that a path for the spark back to house ground through AC Neutral exists independent of line plug polarity. The split ring and the center conduction plate should be constructed so that the spacing between them conforms to UL requirements. The spark gap will absorb most of the ESD leaving a remnant of about 10kV for the rest of the circuit to absorb. Step 2: Increase R3 from 1kΩ to 5.1kΩ and add C7, a 0.1µF capacitor, between VDD and Vss. (A minimal loss in touch sensitivity may be experienced.) Step 3: Replace diodes D2 and D3 (1N4148) with Schottky diodes (1N5819 or similar) |
Nº de peça semelhante - LS7541_07 |
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Descrição semelhante - LS7541_07 |
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