LS7237 Ver la hoja de datos (PDF) - LSI Corporation
Número de pieza
componentes Descripción
Fabricante
LS7237 Datasheet PDF : 4 Pages
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EXT (Pin 6)
CONDUCTION ANGLE, Ø
The EXT input is functionally similar to the SENS input with
No output
the exception that a high-level pulse is the active signal. It is
45˚
recommended that the EXT input be used instead of the
70˚
SENS input when long extension wires are used between the
105˚
IC and the sensing circuitry (See Figure 5 and Figure 6) be-
158˚
cause the EXT input is less susceptible to “Noise”.
BRIGHTNESS LEVEL
Off
Night Light
Mood Light
Medium
Maximum
VDD (Pin 7)
Supply voltage negative terminal.
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.
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:
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.
SYNC
ø
TRIG
TW
TW
FIGURE 2. TRIG OUTPUT CONDUCTION ANGLE, Ø
TS1
SENS
158˚
158˚
158˚
Ø, MODE 0
OFF
70˚
Ø, MODE 1 OFF
45˚
Ø, MODE 2
OFF
OFF
105˚
70˚
158˚
105˚
OFF
70˚
OFF
158˚
OFF
7237-041395-2
FIGURE 3. TRIG OUTPUT CONDUCTION ANGLE, Ø, VS SENS INPUT
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