MLX90805
Intelligent Triac Controller
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
V
+0.5
Vzc1l
Low level threshold 1
VDDA
V
-0.5
Vzc2h
High level threshold 2
VDDA
V
-1.5
Vzc2l
Low level threshold 2
VDDA
V
-2.5
Rzc
External resistor
470
kΩ Vline = 230VAC typ
Triac (Ignition) Driver
This driver operates as a current generator to fire the triac ON.
Symbol
Description
Min Typ Max
ITRG
Triac gate current
30 60 90
Unit Conditions
mA VDDA > Vaporh
ADC
Symbol
VREF
Description
Resolution
Reference voltage
Min Typ Max
4
4.6 5
5.4
Unit Conditions
bits
V
MLX90805 Intelligent Triac Controller
Page 4
Rev 1.2 17/May/00