STEVAL-ILL004V1 STMicroelectronics, STEVAL-ILL004V1 Datasheet - Page 11

• 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:
Note:
2.3.2
When the main voltage for the components used in this application is 110 V
maximum output current is expressed as:
Equation 3
The real maximum current capability measured on the board is I
value is a little bit lower than the value coming from the equation, so the capacitive supply
design has to be calculated with some reserve (approximately 20%).
The output electrolytic capacitor C2 is charged through diode D2 from the voltage on the
Zener diode. The output voltage is expressed as:
Equation 4
Resistor R1 is used to reduce the inrush current and its power loss is expressed as:
Equation 5
Three thru-hole resistors of 150
ensure their low temperature.
TRIAC power dissipation
Calculating the maximum output power (maximum load) is one of the most important tasks
in this design, and the power capability depends mainly on the TRIAC being used. The
current capability of this TRIAC limits the maximum output power. The design is versatile, so
designers are able to choose the best TRIAC that produces the maximum output power for
their applications.
The BTB16-600CW is a 16 A TRIAC with a heat sink built into this evaluation board that
controls the power-up to 1 kW. For power requirements less than 1 kW (e.g., light dimmers),
the ACST6-7S (ST’s 6A TRIAC) or similar can be used. Both TRIACs are snubberless, so
they do not need any other external snubber circuitry as protection. Recommended TRIACs
for motor speed control and light dimmer are in
How to calculate the size of the heat sink
The current flowing through the TRIAC increases its temperature. If the current is too high
(i.e., higher than 1.5 A for ACST6-7S), it is necessary to use a heat sink. A typical heat sink
calculation is:
Equation 6
P
R1
=
R
1
•
I
2
=
R1
I
OUT
•
⎛
⎜
⎜
⎜
⎜
⎜
⎝
---------------------------------------- -
⎛
⎜
⎝
--------------- - R
2πfC
=
1
V
-----------------------------------------------------------------------------------------------
2
RMS
I
•
1
Ω
=
⎛
⎜
⎝
+
------------------------------------------------------------
2π60
-------- -
U
(R6, R7, and R10) are designed in this application to
1
P
V
IN
⎞
⎟
⎠
⎞
⎟
⎟
⎟
⎟
⎟
⎠
OUT
2
•
110 5.6
=
=
330
1
1000
------------ -
450
230
=
–
V
•
ZD
•
10
Section
=
⎛
⎜
⎜
⎜
⎜
⎝
----------------------------------------------------------------------------- -
---------------------------------------------------------- -
2π50
–
–
9
V
4.35 A
+
D2
450
•
2.2.2.
330
⎞
⎟
⎠
1
Universal motor speed control
230
=
•
6.14mA
10
OUT
–
9
+
= 5.6 mA. This real
450
⎞
⎟
⎟
⎟
⎟
⎠
2
ac
=
0.23 W
/ 60 Hz, the
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