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LS7237 Datasheet(PDF) 2 Page - LSI Computer Systems |
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LS7237 Datasheet(HTML) 2 Page - LSI Computer Systems |
2 / 4 page The information included herein is believed to be accurate and reliable. However, LSI Computer Systems, Inc. assumes no responsibilities for inaccuracies, nor for any infringements of patent rights of others which may result from its use. CONDUCTION ANGLE, Ø BRIGHTNESS LEVEL No output Off 45˚ Night Light 70˚ Mood Light 105˚ Medium 158˚ Maximum NOTE: In the schematic shown in Figure 5, the SYNC Input sig- nal is delayed in phase with respect to the AC Line by about 7°. This delay reduces the conduction angle, Ø with respect to the AC Line by 7° from the values shown above. 7237-041395-2 ø TRIG SYNC T W TW FIGURE 2. TRIG OUTPUT CONDUCTION ANGLE, Ø EXT (Pin 6) The EXT input is functionally similar to the SENS input with the exception that a high-level pulse is the active signal. It is recommended that the EXT input be used instead of the SENS input when long extension wires are used between the IC and the sensing circuitry (See Figure 5 and Figure 6) be- cause the EXT input is less susceptible to “Noise”. VDD (Pin 7) Supply voltage negative terminal. TRIG (Pin 8) The TRIG output is a low-level pulse of fixed duration oc- curring once every half-cycle of the SYNC input. The con- duction angle, Ø of the output in relation to the SYNC signal controls the lamp brightness. The 5 levels of brightness cor- respond to the 5 values of Ø as follows: SENS Ø, MODE 0 Ø, MODE 1 Ø, MODE 2 TS1 OFF OFF OFF 70˚ 45˚ OFF 105˚ 70˚ 158˚ 158˚ 105˚ OFF OFF 158˚ 158˚ 70˚ OFF FIGURE 3. TRIG OUTPUT CONDUCTION ANGLE, Ø, VS SENS INPUT 158˚ |
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