STEVAL-ILL004V1 STMicroelectronics, STEVAL-ILL004V1 Datasheet - Page 5

• Manufacturer Part Number: STEVAL-ILL004V1
• Description: EVAL BOARD PHASE CONTROL DIMMER
• Manufacturer: STMicroelectronics
• Type: Power Management: Lighting and Ballast Controllerr

Specifications of STEVAL-ILL004V1

• Design Resources: STEVAL-ILL004V1 Gerber Files STEVAL-ILL004V1 Bill of Material STEVAL-ILL004V1 Schematic
• Contents: Fully Assembled Evaluation Board
• Product: Display Modules
• For Use With/related Products: ST7FLITE09
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: 497-5081

AN2263
1
Phase-angle adjustment motor control
Control techniques for mono phase motors or any AC load are based on phase-angle
adjustment. This principle is shown in
signal coming from the microcontroller with some delay after the zero crossing, and
automatically turned OFF when its current reaches a zero value. This behavior is the same
for positive and negative voltage.
There are only a few “turn ON” limitations along the zero crossing, when the current is not
high enough (lower than the TRIAC's latching current), so the power to the load cannot be
regulated from 0 to 100%. As the switch represents the main power component in these
applications, the ACST switch family can improve the parameters of these devices. The
ACST switch family embeds a TRIAC structure with a high voltage clamping device to
absorb the inductive turn-off energy and withstand line transients such as those described in
the IEC61000-4-5 standards. The main benefits of using the ACST switch are to enable
equipment to meet IEC61000-4-5, high OFF state reliability with planar technology, it needs
no external overvoltage protection, has direct interface with the microcontroller, and reduces
the power component count.
Figure 2.
AC load control phase-angle adjustment
Controlled
phase angle
I load
V SOURCE
Figure
V SOURCE
2. The TRIAC is turned ON by the control
Control
t
Phase-angle adjustment motor control
~
Z
AC load
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