STEVAL-ILL004V1 STMicroelectronics, STEVAL-ILL004V1 Datasheet - Page 13

• 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
Note:
2.3.3
This calculation is done for an ambient temperature of 40 °C and the TRIAC that is on the
evaluation board. The size of the heat sink can be dramatically decreased if the TRIAC is
placed in a vacuum cleaner or any similar device which can cool it.
ZCD resistor calculations
In order to synchronize the opening of the TRIAC with the input sinusoidal voltage waveform
in each period, the microcontroller must make the zero crossing detection. Resistors R1 and
R2, capacitor C2, and two internal clamping diodes (inside the microcontroller) provide this
means of detection (see
voltage of 230 V
Equation 10
The maximum voltage along the resistors is 325 V (RMS voltage value is 230 V
it is necessary to connect at least two resistors in series in order to avoid overvoltage. For
example, the maximum voltage for the 1206 Surface Mount Device (SMD) resistor is 200 V.
The actual ZCD circuit waveforms are shown in
The values were measured in the light dimmer application with a 60 W bulb (see
Figure 8.
ZCD circuit
ac
Input AC
voltage
can be calculated as follows:
P
Figure
R1
160 KΩ
,
R1
R2
8). The power dissipation in the resistors with an input
=
V
----------------------- -
R1
INRMS
+
160 KΩ
R2
R2
100 pF
2
=
------------------- -
320000
230
Figure
C2
PA0
2
=
9:
V CC
0.1653 W
Universal motor speed control
D
D
Microcontroller
AI11889a
ac
) therefore,
Section
13/38
3).