MLX90805S datasheet(6/13 Pages) ETC

6 / 13 page

MLX90805

Intelligent Triac Controller

MLX90805 Intelligent Triac Controller

Page 6

Rev 1.2

17/May/00

Pinout

Standard package is 8-pin dual inline package.

(Known as DIP-8, PDIP-8, DIL-8 and PDIL-8)

Precautions

Disturbance Immunity

According to pr EN 55014-2

ESD

All I/O pins must withstand the normalized ESD

pulses up to 2kV (100pF / 1.5 k

Ω). The pins will be

stressed in both polarities, with respect to the combi-

nation of all supply pins.

Name

Type

Description

SET

Input

Potentiometer input

THP

Input

Thermal protection

Input

Feed back to create

hysteresis for thermal

protection

Input

Zero cross input

TRG

Output

Triac driver output

VSS

Supply

Ground

VDDA

Supply

Supply, high level

VREF

Output

Reference voltage

Options

The following options are available:

Firing angle definition

The firing angles, and corresponding motor speeds,

can be defined in ROMi[9:0]. This is the ROM table

which is addressed by the ADC reading the

potentiometer setting. The ROM contains 16 words

of 10 bits. For programming the different speed

settings in the ROM table, following formula can be

used, given ti (in msec) is the delay from the

previous zero crossing to the moment of ignition:

With: Fmains = frequency of the mains (in Hz)

Note:

The value should not be negative: very small values

can not be programmed.

The content of the ROM can be defined freely: it

does not need to be linear or continuous. However

for a proper softstart generation under all conditions,

the value with minimum firing angle (thus maximum

speed) must be in the highest ROM address.

Default values:

Rom address

Value

590

567

544

522

500

477

456

434

411

387

362

335

305

273

231

112

]

[

−

•

Fmains

ROMi

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