STK672-210-E データシートの表示（PDF） - SANYO -> Panasonic
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STK672-210-E
SANYO -> Panasonic
STK672-210-E Datasheet PDF : 10 Pages
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STK672-210-E
Thermal Design
The size of the heat sink required for the STK672-210-E depends on the output current IOH (A), the electrical
characteristics of the motor, the excitation mode, and the basic drive frequency.
The thermal resistance (θc-a) of the required heat sink can be determined from the following formula.
θc - a = Tc max - Ta (°C/W)
Pd
Tc max: The STK672-210-E substrate temperature (°C)
Ta: The STK672-210-E ambient temperature (°C)
Pd: The average internal power dissipation in the STK672-210-E (W)
For example, the required area for a heat sink made from 2mm thick aluminum can be determined from the graph at the
right below. Note that the ambient temperature is greatly influenced by the ventilation and air flow patterns within the
application. This means that the size of the heat sink must be determined with care so that the STK672-210-E back
surface (aluminum substrate) temperature Tc in the mounted state never exceeds, under any conditions that might occur,
the temperature Tc = 105°C.
θc-a - Pd
θc-a - S
20
100
No Fin
No Fin
23.0[°C/W]
7
23.0[°C/W]
16
Tc max=105°C
5
Mounted vertically
θc-a=Tc max--Ta (°C/W)
3
Convection cooling
Pd
12
8
temapGmeurbaaitreuanrnetteed
40°C
4
50°C
2
10
7
5
3
2mm thick Al
(With a flat
plate (with no
black surface
surface
finish)
finish)
2
60°C
0
0 2 4 6 8 10 12 14 16 18 20
IC internal average power dissipation, Pd - W
ITF01880
1.0
10
23
5 7 100
23
Heat sink area, S - cm2
5 7 1000
ITF01881
STK672-210-E Average Internal Power Dissipation Pd
Of the devices that contribute to the STK672-210-E average internal power supply, the devices with the largest power
dissipation are the current control devices, the diodes that handle the regenerative current, the current detection resistor,
and the predriver circuit.
The following presents formulas for calculating the power dissipation for the different excitation (drive) modes.
2 phase excitation mode
Pd2EX = (Vsat + Vdf) × 0.5 × CLOCK × IOH × t2 + 0.5 × CLOCK × IOH × (Vsat × t1 + Vdf × t3)
1-2 phase excitation mode
Pd1-2EX = (Vsat + Vdf) × 0.25 × CLOCK × IOH × t2 + 0.25 × CLOCK × IOH × (Vsat × t1 + Vdf × t3)
Motor hold mode
PdHOLDEX = (Vsat + Vdf) × IOH
Vsat: Ron voltage drop + shunt resistor combined voltage
Vdf: FET internal diode + shunt resistor combined voltage
CLOCK: Input clock (shows clock in the timing charts on page 4)
IOH
0A
t1
t2
t3
Figure 1 Motor COM current waveform model
No. 7464-6/10
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