LS7237 datasheet, PDF - EEWORLD Datasheet

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LS7237: DescriptionTOUCH CONTROL LAMP STEP DIMMER; File Size44KB，4 Pages; ManufacturerLSC/CSI; Websitehttps://lsicsi.com

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LS7237 Overview

TOUCH CONTROL LAMP STEP DIMMER

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LSI/CSI

LS7237

(631) 271-0400 FAX (631) 271-0405

April 1995

LSI Computer Systems, Inc. 1235 Walt Whitman Road, Melville, NY 11747

A3800

TOUCH CONTROL LAMP STEP DIMMER

FEATURES:

• PLL synchronization allows use as a Wall Switch

• Provides brightness control of an incandescent lamp

with a touch plate or mechanical switch

• Can control speed of shaded pole and universal AC motors

• Controls the "duty cycle" from 23% to 88% (conduction

angles for AC half-cycles between 45˚ and 158˚, respectively)

• Operates at 50Hz/60Hz line frequency

• Extension input for remote activation

• +12V to +18V DC Power Supply (V

SS -

)

• 8-Pin Plastic DIP , 8-Pin SOIC-See Figure 1

PIN ASSIGNMENT - TOP VIEW

(+V)

TRIG

LSI

MODE

(-V)

LS7237

CAP

EXT

DESCRIPTION:

LS7237 is a monolithic, MOS integrated circuit designed

to control the brightness of an incandescent lamp. The

output of the LS7237 triggers a triac connected in series

with a lamp(See Figure 5). The lamp brightness is de-

termined by controlling the output conduction angle (triac

triggering angle) in relation to the AC line frequency (See

Figure 2).

The output conduction angle can be varied by applying a

low level pulse at the SENS input or a high level pulse at

the EXT input. When implemented as shown in Figure 5,

this is accomplished by touching the Touch Plate which

causes the lamp brightness to change in specified steps

as follows:

LEVEL

Off

Night Light

Mood Light

Medium

Maximum

BRIGHTNESS (% Rated Wattage)

SYNC

SENS

FIGURE 1

INPUT/OUTPUT DESCRIPTION:

(Pin 1)

Supply voltage positive terminal.

MODE (Pin 2)

The operating mode for the circuit is selected by con-

necting this input as follows:

MODE INPUT

Float

SELECTED MODE

Mode 0

Mode 1

Mode 2

The LS7237 can operate in one of three different modes

selected by the MODE input. The Brightness Sequences

produced by the different modes are as follows:

MODE

BRIGHTNESS SEQUENCE

Off-Max-Off

Off-Mood-Med-Max-Off

Off-Night-Mood-Med-Max-Off

CAP (Pin 3)

PLL filter input capacitor. A 0.047µF capacitor should be

connected to this input.

SYNC (Pin 4)

The AC Line Frequency is applied to this input through an

external RC circuit (See Figure 5). The Phase-Lock Loop

in the IC synchronizes all internal timings to the AC signal

at the SYNC input.

SENS (Pin 5)

A low-level pulse applied to this input causes the TRIG out-

put to step to the next conduction angle in the sequence

selected by the MODE input. The change in conduction an-

gle takes place with the trailing edge of the SENS input

pulse.

After AC power-up, the output comes up in the OFF state.

Following that, every time the Touch Plate is touched, the

output steps to the next level of brightness. The next step

following the maximum brightness is the OFF state, in-

itiating a new sequence.

7237-041100-1

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