STEVAL-ILL004V1 STMicroelectronics, STEVAL-ILL004V1 Datasheet - Page 7

• 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
2.1
2.2
2.2.1
2.2.2
Block schematic
The ‘heart’ of this application is the ST7FLITE09 microcontroller which controls the TRIAC
(see
each of the cycles is provided by zero crossing detection (ZCD). The microcontroller detects
the zero crossing after each period of the input signal and sets the time to switch on the
TRIAC in relation to the value of the potentiometer voltage.
Due to the low power consumption (approximately 5.5 mA), there is a capacitive power
supply integrated into the design. Its calculation is described in the
produces a noise when it is turned ON or OFF, so the input Electromagnetic Interference
(EMI) filter should be connected to the board as well. There is a passive C filter assembled
and its value can be designed as required because there is enough place on the board for
such components. Different packages for the input filtering capacitor can be used also.
Figure 4.
Application schematic
Figure 5
components L1, C9, C8, and R9 are not necessary for motor speed control, so they are not
used (see
EMI filter noise reduction
The versatility of the board allows for the EMI filter (C7, L1, and C9) to be designed as a
CLC connection (Π element) to reduce the noise coming from the board to the mains. For
motor control applications, it is enough to use only an input capacitor (for example:
C7 = 470 nF) to guarantee the requested standards (see
inductor is not required, a jumper is provided to disconnect it on the board.
TRIACs with integrated snubber
ST has a family of snubberless TRIACs, where the snubber is integrated, making it
unnecessary to use external components for overvoltage protection. If the standard TRIAC
is used, the snubber circuit (C8 and R9) should be assembled to prevent the TRIAC from
spurious turn-on. The new ACST switch family embeds a TRIAC structure with a high
voltage clamping device to absorb the inductive turn-off energy (motor) and withstand line
transients such as those described in the IEC61000-4-5 standards. Recommended ST
Figure
shows the universal motor speed control application schematic. In this case,
Figure
4). The synchronization required to switch on the TRIAC at the same time for
MAINS
STEVAL-ILL004V1 motor speed control block diagram
230V
3).
Filter
LOAD
M
TRIAC
R
Supply
Microcontroller
ST7FLITE09
Section 4
Universal motor speed control
(push-button or
potentiometer)
Section
for details). If an input
Control
AI11886
2.3. The TRIAC
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