TIMING CHARACTERISTICS (See Figures 2, 3 and 4):

PARAMETER

SYMBOL

MIN

TYP

MAX

UNI T

CONDITION

SYNC Frequency

fs

40

-

70

Hz

-

SHORT Touch

42

-

333

ms

60Hz

50

-

400

ms

50Hz

LONG Touch

342

-

infinite

ms

60Hz

410

-

infinite

ms

50Hz

TRIG pulse width (see Note 5)

Tw

-

130

-

µs

60Hz

Tw

-

156

-

µs

50Hz

Conduction Angle

ø

50

-

154

deg

-

ø incremental steps

∆ø

-

1.4

-

deg

-

(Note 1)

Soft-on slew rate

-

1.4

-

deg/8.33ms

60Hz

-

1.4

-

deg/10ms

50Hz

A0 to A1/A2 to A0 slew rate

-

1.4

-

deg/33.3ms

60Hz

(Note 2)

-

1.4

-

deg/40ms

50Hz

A1 to B1/B2 to A2 slew rate

-

1.4

-

deg/66.7ms

60Hz

(Note 3)

-

1.4

-

deg/80ms

50Hz

B1 to B2 delay

-

500

-

ms

60Hz

(Note 4)

-

600

-

ms

50Hz

Note 1: Total number of steps = 77.

Note 2: Number of steps from A0 to A1, or A2 to A0 = 55.

Note 3: Number of steps from A1 to B1 or B2 to A2 = 21.

For LS7635 when minimum ø is reached, dimming direction reverses only if the LONG Touch is terminated and reapplied.

7634/7635-071406-3

FIGURE 3. LS7634 TRIG, Ø vs TOUCH (SENS OR EXT)

ø

TRIG

SYNC

FIGURE 2. TRIG OUTPUT CONDUCTION ANGLE, Ø

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.

150º

100º

50º

OFF

150º

100º

50º

OFF

150º

100º

50º

OFF

Ø

MODE Ø

Ø

MODE 1

Ø

MODE 2

SENS

342ms

SHORT

SHORT

LONG

SHORT

LONG

SHORT

LONG

A2

B2

B1

A1

A0

A2

B2

B1

A2

B2

B1

A1

A0

A0

A0

A1

A2

A2

MEMORY

REVERSE

REVERSE

SLOPE = Ss

B2

B2