STK672-340-E Просмотр технического описания (PDF) - SANYO -> Panasonic
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STK672-340-E
SANYO -> Panasonic
STK672-340-E Datasheet PDF : 13 Pages
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STK672-340-E
T1: Motor rotation operation time
T2: Motor hold operation time
T3: Motor current off time
T2 may be reduced, depending on the application.
T0: Single repeated motor operating cycle
IO1 and IO2: Motor current peak values
Due to the structure of motor windings, the phase current is a positive and negative current with a pulse form.
Note that figure 2 presents the concepts here, and that the on/off duty of the actual signals will differ.
The hybrid IC (HIC) internal average power dissipation PD can be calculated from the following formula.
PD = (T1 × P1 + T2 × P2 + T3 × 0) ÷ T0 ·························································· (I)
(Here, P1 is the PD for IO1 and P2 is the PD for IO2)
If the value calculated in formula (I) above is under 1.5W, then from figure 5 we see that operation is allowed up to
an ambient temperature Ta of 60°C.
While the operating range when a heat sink is not used can be determined from formula (I) above, figure 4 is merely
a single example of one operating mode for a single motor.
For example, while figure 4 shows a 2-phase excitation motor, if 1-2 phase excitation is used with a 500Hz clock
frequency, the drive will be turned off for 25% of the time and the dissipation PD will be reduced to 75% of that in
figure 4.
It is extremely difficult for SANYO to calculate the internal average power dissipation PD for all possible end
product conditions. After performing the above rough calculations, always install the hybrid IC (HIC) in an actual
end product and verify that the substrate temperature Tc does not rise above 105°C.
[Operating range in which a heat sink is used]
Although a heat sink is attached to lower Tc if the hybrid IC (HIC) internal average power dissipation PD increases,
the resulting size can be found using the value of θc-a in Equation (II) below and the graph depicted in Figure 6.
θc-a= (Tc max-Ta) ÷ PD ---------------------------- (II)
Tc max: Maximum operating substrate temperature =105°C
Ta: HIC ambient temperature
Although a heat sink can be designed based on equations (I) and (II) above, be sure to mount the HIC in a set and
confirm that the substrate temperature, Tc, is 105°C or less.
The average HIC power loss, PD, described above represents the power loss when there is no avalanche operation.
To add the loss during avalanche operations, be sure to add Equation (2), “Allowable STK672-3** Avalanche
Energy Value”, to PD.
Figure 6
100
7
5
3
2
10
7
5
3
2
θc-a - S
With
With
a flat
nbolascukrfsaucrefafcienifsihnish
1.0
10
23
5 7 100
23
Heat sink area, S - cm2
5 7 1000
ITF02652
No.A1254-7/13
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