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MC3479PG Datasheet(PDF) 8 Page - ON Semiconductor |
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MC3479PG Datasheet(HTML) 8 Page - ON Semiconductor |
8 / 10 page MC3479 http://onsemi.com 8 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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