MLX90804 Datasheet, PDF (4/12 Pages) List of Unclassifed Manufacturers – Speed regulator for universal motors

MLX90804
Speed regulator for universal motors
Zero crossing detector
This detector contains two comparators with hysteresis. The first comparator has reference at VDD1. The refer-
ence of the second one is VDD1-1V. Both outputs ZC1 and ZC2 are HIGH during positive half wave of the mains
and LOW during negative half wave of the mains.
Parameter
Symbol Test Conditions
Min Typ Max Units
High level threshold 1
Vzc1h Referenced to VDD1
0.5
V
Low level threshold 1
Vzc1l Referenced to VDD1
-0.5
V
High level threshold 2
Vzc2h Referenced to VDD1
-1.5
V
Low level threshold 2
Vzc2l Referenced to VDD1
-2.5
V
Speed measurement
The chip has an input SPD to measure the motor speed. It is possible to connect a low cost inductor (between
SPD and VSS) or a hall sensor with digital output. . The type of sensor can be defined by mask option. In case
of the use of a coil the input levels are defined in the table below. In case of the use of a hall sensor, the levels
are cmos compatible.
Parameter
Symbol Test Conditions
Min Typ Max Units
High comparator level
SPDHI
80
mV
Low comparator level
SPDLO
-80
mV
Note:
When used with a coil, the input voltage is on chip limited to approximately –280mV. However the current in-
jected or pulled out of this pin should not increase above 1 mA.
When used with a hall sensor, the SPD input does not have an internal pull up resistor.
Ignition driver
This driver operates as a current generator to fire the triac.
Parameter
Triac gate current
Symbol Test Conditions
ITRG
VDD1 > Vaporh
Min Typ Max Units
30 60 90 mA
ADC
This is a 4-bit ADC.
Parameter
Resolution
Reference voltage
Symbol Test Conditions
Vref
Min Typ Max Units
4
bits
VDD
MLX90804 Speed regulator for universal motors
Page 4
Rev 1.0 30/Jun/00