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LS7541 Scheda tecnica(PDF) 1 Page - LSI Computer Systems |
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LS7541 Scheda tecnica(HTML) 1 Page - LSI Computer Systems |
1 / 5 page TOUCH CONTROL STEP DIMMER LIGHT SWITCH WITH AUTOMATIC GAIN CONTROL (AGC) FEATURES: • Touch Sensitivity guaranteed to 600pF Touch Plate Capacitance. • Touch Operation independent of line plug polarity. • Pin selection of three available Brightness Step Sequences. • Minimal external components. • AGC Loop stabilizes immediately after Power-Up. • Brightness state is Off after AC power applied. • Brightness state is unchanged if AC power interrupted for < 0.5 sec. • Advanced CMOS design for reliable operating characteristics and low power. • 50/60 Hz Line Frequency. • 5V Operation (VDD - VSS). • LS7541 (DIP); LS7541-S (SOIC) - See Figure 1 - APPLICATIONS: • Screw-in and built-in adapter modules for converting table and floor lamps to touch control for step dimming. • On-Off touch control of under-cabinet fluorescent lamps. DESCRIPTION: The LS7541 is a CMOS integrated circuit which provides trigger pulses for triac phase control of incandescent lamps. The circuits are designed to operate with a wide variety of lamp sizes ranging from small table lamps to large floor lamps. The AGC Loop automatically adjusts Touch Sensitivity to be independent of lamp size. There are 3 different Brightness Step Sequences for each version of the IC which can be selected by the Three-State MODE pin as shown in Table 1. TABLE 1. BRIGHTNESS STEP MODES MODE PIN BRIGHTNESS STEP SEQUENCE FLOAT OFF-NIGHT LIGHT-MEDIUM-MAXIMUM-OFF VDD OFF-NIGHT LIGHT- LOW MEDIUM-HIGH MEDIUM-MAXIMUM-OFF Vss OFF-MAXIMUM-OFF The lamp brightness is made to vary by changing the delay of the TRIG pulse to the triac from the zero-crossing of the SYNC input. The delays are shown in Table 2 for 50Hz and 60Hz operation along with Delivered Power as a percentage of Full Power. Figure 2 illustrates the delay. PIN ASSIGNMENT TOP VIEW May 2006 7541-051106-1 TABLE 2. BRIGHTNESS POWER LEVELS Brightness 60Hz Delay (1) 50Hz Delay (2) % PWR (3) Night Light 6.0 ms 7.2 ms 12 Low Medium 4.8 ms 5.7 ms 35 Medium 4.0 ms 4.8 ms 53 High Medium 3.2 ms 3.8 ms 72 Maximum 0.85 ms 1.0 ms 99 (1) With 400k Ω connected between Pin 1 and VDD. (2) With 470k Ω connected between Pin 1 and VDD. (3) Percentage of Full Power delivered to a resistive load by the Triac Switch. LSI/CSI LSI Computer Systems, Inc. 1235 Walt Whitman Road, Melville, NY 11747 (631) 271-0400 FAX (631) 271-0405 LS7541 UL ® A3800 1 2 3 4 8 7 6 5 FIGURE 1 V DD (+V ) MODE CONTROL V SS (-V ) SYNC CLOCK TOUCH TRIG |
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