STK673-010 Просмотр технического описания (PDF) - SANYO -> Panasonic

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STK673-010

3-Phase Stepping Motor Driver (sine wave drive) Output Current 2.4A

SANYO -> Panasonic 

STK673-010

Figure 3. Timing Chart of Motor Operation

The average power loss Pd in the hybrid IC upon an operation shown in Figure 3 can be obtained by the following equa-

tion (II):

Pd = (T1×P1 + T1×P2 + T3×P3 + T4×P4)÷T0

...(II)

When the value obtained by the above equation (II) is equal to or less than 3.4W and the ambient temperature Ta is equal

to or lower than 60°C, there is no need of providing a heat sink.

Refer to Figure 7 for data of the operation substrate temperature when no heat sink is used.

The size of the heat sink can be decided depending on θc-a obtained by the following equation (III) and from Figure 8.

θc-a = (Tc max – Ta)÷Pd

..... (III)

where Tc max: Maximum operation substrate temperature = 105°C

Ta: Ambient temperature of hybrid IC

Although heat radiation design can be realized by following the above equations (II) and (III), make sure to check that

the substrate temperature Tc is equal to or lower than 105°C after mounting the hybrid IC into a set.

No. 5708—9/16

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