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STK672-050-E Datasheet(PDF) 17 Page - Sanyo Semicon Device

Part No. STK672-050-E
Description  Stepping Motor Driver (sine wave drive) Output Current 3.0A (no heat sink*)
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Manufacturer  SANYO [Sanyo Semicon Device]
Direct Link  https://www.sanyo-av.com/us/
Logo SANYO - Sanyo Semicon Device

STK672-050-E Datasheet(HTML) 17 Page - Sanyo Semicon Device

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STK672-050-E
No.5228-17/19
<Determining the Size of the Hybrid IC Heat Sink>
Determine
θc-a for the heat sink from the average power loss determined in the previous item.
Tc max: Hybrid IC substrate temperature (
°C)
θc-a =
[
°C/W]
Ta: Application internal temperature (
°C)
PdEX: Hybrid IC internal average loss (W)
Determine
θc-a from the above formula and then size S (in cm2) of the heat sink from the graphs shown below.
The ambient temperature of the device will vary greatly according to the air flow conditions within the application.
Therefore, always verify that the size of the heat sink is adequate to assure that the Hybrid IC back surface (the
aluminum plate side) will never exceed a Tc max of 105
°C, whatever the operating conditions are.
Next we determine the usage conditions with no heat sink by determining the allowable hybrid IC internal average loss
from the thermal resistance of the hybrid IC substrate, namely 18.5°C/W.
For a Tc max of 105°C at an ambient temperature of 50°C
PdEX =
= 2.9W
For a Tc max of 105°C at an ambient temperature of 40°C
PdEX =
= 3.5W
This hybrid IC can be used with no heat sink as long as it is used at operating conditions below the losses listed above.
(See
ΔTc – Pd curve in the graph on page 19.)
<Hybrid IC internal power element (MOSFET) junction temperature calculation>
The junction temperature, Tj, of each device can be determined from the loss Pds in each transistor and the thermal
resistance
θj-c.
Tj = Tc +
θj-c × Pds (°C)
Here, we determine Pds, the loss for each transistor, by determining PdEX in each excitation mode.
Pds = PdEX/4
The steady-state thermal resistance
θj-c of a power MOSFET is 5°C/W.
EX
Pd
Ta
-
max
Tc
18.5
50
-
105
18.5
40
-
105
IC internal average power loss, Pd - W
θc-a - Pd
ITF02402
Heat sink surface area, S - cm2
θc-a - S
ITF02403
4
0
8
12
16
20
0
2
4
6
8
10
12
14
16
40°C
60°
C
θc-a= Tc max -- Ta (°C/W)
Tc max=105°C
Pd
No. Fin 23.0 (°C/W)
50°C
2
1.0
3
7
5
10
2
10
23
5
7
100
23
5
No. Fin 23.0 (°C/W)
2m
m
Al p
late
(no
surf
ace
finis
h)
(flat
blac
k su
rfac
e fin
ish)
Vertical
standing type
Natural
convection
air cooling


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