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MC3479 Arkusz danych(PDF) 8 Page - ON Semiconductor

Numer części MC3479
Szczegółowy opis  Stepper Motor Driver
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Producent  ONSEMI [ON Semiconductor]
Strona internetowa  http://www.onsemi.com
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Figure 8. Power Supply Current
50
IBS (mA)
IOD = 0
10
20
0
60
50
40
30
70
150
200
250
300
350
100
Figure 9. Maximum Saturation Voltage −
Driver Output Low
IOD (mA)
0
100
200
300
0.8
0.6
0.4
0.2
0
For example, assume an application where VM = 12 V, the
motor requires 200 mA/coil, operating at room temperature
with no heatsink on the IC. From Figure 11, IBS is
determined to be 95
mA.
RB is calculated:
RB = (12 − 0.7) V/95 mA
RB = 118.9 kW
From Figure 8, IM (max) is determined to be 22 mA. From
Figure 9, VOLD is 0.46 V, and from Figure 10, (VM − VOHD)
is 1.4 volts.
P = (12
 0.022) + (2  0.2) (1.4 + 0.46)
P = 1.01 W
TJ = (1.01 W  52°C/W) + 25°C
TJ = 77.5°C
This temperature is well below the maximum limit. If the
calculated TJ had been higher than 150°C, a heatsink such
as the Staver Co. V−7 Series, Aavid #5802, or Thermalloy
#6012 could be used to reduce RqJA. In extreme cases,
forced air cooling should be considered.
The above calculation, and RqJA, assumes that a ground
plane is provided under the MC3479 (either or both sides of
the PC board) to aid in the heat dissipation. Single nominal
width traces leading from the four ground pins should be
avoided as this will increase TJ, as well as provide
potentially disruptive ground noise and IR drops when
switching the motor current.
Figure 10. Maximum Saturation Voltage −
Driver Output High
1.5
2.0
IOD (mA)
1.0
0.5
0
0
100
200
300
Figure 11. Bias/Set Current − Output Drive Current
140.00
120.00
100.00
80.00
60.00
40.00
20.00
0.00
0.00
50.00
100.00
150.00
200.00
250.00
300.00
IOD (mA)


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