STEVAL-ILL004V1 STMicroelectronics, STEVAL-ILL004V1 Datasheet - Page 12

• 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

Universal motor speed control
12/38
where,
P = the output power in the application (1 kW, for the ACST6-7S TRIAC), so the RMS
current flow (I) through the TRIAC for 1 kW is 4.35 A.
Maximum power dissipation
The maximum power dissipation on the TRIAC versus the RMS ON state current (full cycle)
is described in the ACST6-7S datasheet.
TRIAC for 4.35 A of current is approximately 4.8 W.
Figure 7.
This power is lost in the TRIAC. The total power dissipation, when the heat sink is used, is
expressed as follows:
Equation 7
where,
After the heat sink-to-ambient thermal resistance is calculated from the equation above, the
correct heat sink can be chosen from the value expressed as follows:
Equation 8
For example,
the thermal resistance of the heat sink for the output power of 3 kW using a BTB16-600CW
TRIAC is expressed as follows:
Equation 9
R
thHA
–
–
–
–
–
≤
T
-------------------------------------------------------------------------------- -
T
T
R
R
0.8 for the insulating washer)
R
J
A
J
thJC
thCH
thHA
–
= maximum junction temperature [°C]
= ambient temperature [°C]
Maximum power dissipation vs. RMS ON state current (full cycle)
T
A
= junction-to-case thermal resistance [°C / W]
= case-to-heat sink thermal resistance [°C / W] (usually between 0.35 and
= heat sink-to-ambient thermal resistance [°C / W]
–
P
R
•
thHA
R
P
th
JC
8
7
6
5
4
3
2
1
0
P (W)
≤
0
125 40
---------------------------------------------------------------------------- -
–
P R
–
•
P
1
=
t
hCH
–
----------------------------------------------------------------------- -
R
14
thJC
=
2
14
IT (RMS) (A)
•
Figure 7
125 40
------------------------------------------------------------------------------- -
1.2 14
+
T
R
J
–
th
3
–
–
CH
T
A
shows that the power dissipation on the
+
–
•
R
4.8
0.5
4
thHA
4 8
•
,
=
2.5 4.8
4.37° C
5
–
6
⁄
•
0.5
W
AI14519
=
14.7° C
AN2263
⁄
W