MLX90805 Просмотр технического описания (PDF) - Melexis Microelectronic Systems
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MLX90805 Datasheet PDF : 13 Pages
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MLX90805
Intelligent Triac Controller
Features and Benefits
“Soft Start” Eliminates Current Surges
Integrated Design Eliminates External Components
Drives Virtually Any Resistive or Inductive Load
Built–in Thermal Protection
Digital Design For Stable Triac Control
Immune to Lifetime and Thermal Drift
Low Power Consumption
50Hz/60Hz Operation
Applications
AC Light Dimmer
Soft-Start AC Motor Controller
Variable-Speed AC Motor Controller
Ordering Information
Part No.
Temperature Suffix
Package
version
Temperature Range
MLX90805 S
A
-x
0C to 85C
MLX90805 S
L
-x
0C to 85C
The customer specific version code (defining the options) is indicated with 1 character at
the end of the ordering number.
Functional Diagram
90805
ZCD
SET
ADC
Vref
Vref
Vss
Vdda
Voltage
regulator
zero
crossing
detector
Lookup
ROM
Vref/2
COMP
Power monitoring
and reset
Logic
Triac driver
Auto
retriggering
Options
Description
The MLX90805 is a power control IC ideally suited
for control of any resistive or inductive load
regulated by a triac.
The chip was designed primarily for starting and
speed control of AC motors, but will work equally well
with any Inductive or resistive load such as
Incandescent lights.
The chip’s primary purpose is to provide a “soft start”
for a motor, preventing current inrush. The triac is
controlled by a linear “ramp” from minimum to
maximum power. Start rate can be varied from 0.5
sec. to 3 sec, by changing the option bits.
The secondary function of the 90805 is proper
ignition of the triac for inductive and resistive loads,
while keeping the triac’s current consumption to a
minimum.
Added features include a frequency locked loop for
stable ignition point.
THP
FB
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RePvaYg.Xe 1
22/Aug/98 Rev 1.2 17P/Magaey1/00
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