MLX90805

Intelligent Triac Controller

MLX90805 Intelligent Triac Controller

Page 4

Rev 1.2

17/May/00

Zero Cross Detector

This detector contains two comparators with hysteresis. The first comparator has its reference at VDDA. The

reference of the second one is VDDA-1V.

Symbol

Description

Min

Typ

Max

Unit

Conditions

Vzc1h

High level threshold 1

VDDA

+0.5

V

Vzc1l

Low level threshold 1

VDDA

-0.5

V

Vzc2h

High level threshold 2

VDDA

-1.5

V

Vzc2l

Low level threshold 2

VDDA

-2.5

V

Rzc

External resistor

470

k

Ω

Vline = 230VAC typ

Triac (Ignition) Driver

This driver operates as a current generator to fire the triac ON.

Symbol

Description

Min

Typ

Max

Unit

Conditions

ITRG

Triac gate current

30

60

90

mA

VDDA > Vaporh

ADC

Symbol

Description

Min

Typ

Max

Unit

Conditions

Resolution

4

bits

VREF

Reference voltage

4.6

5

5.4

V