UP/DOWN SIGNAL DURATION

SHORT

LONG

INPUT

34ms to 325 ms

More than 334ms

UP

DOWN

PRE-ACTIVATION

BRIGHTNESS

Off

Max.

Intermediate

Off

Max.

Intermediate

POST-ACTIVATION

BRIGHTNESS

Memory **

(See Note 1)

No Change

No Change

No Change

Off *

Off *

PRE-ACTIVATION

BRIGHTNESS

Off

Max.

Intermediate

Off

Max.

Intermediate

POST-ACTIVATION

BRIGHTNESS

Increases from Min.

No change

Increases from pre-

touch brightness

No change

Decreases from Max.

Decreases from pre-

touch brightness

* 5.6 second ramp-down from max. to off. Ramp-down time from any other brightness is proportionally shorter.

** 2.8 second ramp-up from off to max.

NOTE 1: "Memory" refers to the brightness stored in the memory. The brightness is stored in memory when the

lamp is turned off by a short activation. First time after power-up, a short activation produces max. brightness.

INPUT/OUTPUT DESCRIPTION:

Supply voltage positive terminal.

DOZE (Pin 2)

A clock applied to this input causes the brightness to de-

crease in equal increments with each negative transition

of the clock. Eventually, when the lamp becomes off, this

input has no further effect. The lamp can be turned on

again by activating the UP input. For the transition from

maximum brightness to off, a total of 83 clock pulses are

needed at the DOZE input.

When either the UP or the DOWN input is active, the

DOZE input is disabled.

CAP (Pin 3)

The CAP input is for external component connection for

the PLL filter capacitor. A capacitor of 0.047µF ± 20%

should be used at this input.

SYNC (Pin 4).

The AC line frequency (50Hz/60Hz), when applied to this

input, synchronizes all internal timings through a phase

lock loop. The signal for this input may be obtained from

the line voltage by employing the circuit arrangement

shown in the application examples.

UP (Pin 5).

This input controls the turn-on and the conduction angle, ø ,

of the TRIG output. A description of this is provided in the

DESCRIPTION and TABLE 1. For LS7534, a logic low level

is the active level whereas for LS7535 a logic high level is

the active level. LS7535 has an internal pull-down resistor

of about 500K Ohms on this input.

DOWN (Pin 6).

This input controls the turn-off and the conduction angle, ø,

of the TRIG output. A description of this is provided in the

DESCRIPTION and TABLE 1. For LS7534, a logic low level

is the active level, whereas for LS7535 a logic high level is

the active level. LS7535 has an internal pull-down resistor

of about 500K Ohms on this input.

Supply voltage negative terminal.

TRIG (Pin 8).

The TRIG output provides a low level pulse occurring every

half-cycle of the SYNC signal. The conduction angle, ø, of

the TRIG output can be varied within the range of 41o to

159o by means of either the UP or the DOWN input.

TABLE 1

7534/35-080796-2