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SI-7200M 数据表(PDF) 4 Page - Sanken electric |
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SI-7200M 数据表(HTML) 4 Page - Sanken electric |
4 / 5 page 49 SI-7200M Application Note s Thermal design Procedures for thermal design of SI-7200M are shown below. (1) As shown in the figure below, the supply current ICC and the output current IO are measured at the maximum level of the supply voltage VCC. However, the motor is in holding mode at the 2-phase excitation. (2) From the above measurements, the internal power dissipation (2- phase) of the hybrid IC can be obtained through the following formula. PD = VCC x ICC –2IO2 (RL + RS) Where RL: Resistance of the motor coil between pins 2 and 4 and pins 15 and 17 Shown in the lower graph is a sample calculation of PD vs. IO. (3) The heatsink area corresponding to the ambient temperature can be obtained from the SI-7200M derating curve shown in the right. (4) Verify that the temperature of the aluminum base plate of the hybrid IC or adjacent heatsink is below 85 °C (equivalent to max. ambient tem- perature) when operating under actual load conditions. * For details on thermal design, refer to the tech- nical data book Method for measuring the SI-7200M current VCC1 A A B B Excitation signal (2-phase excitation) Power down A A B B SPM VCC-2 VR44k Ω VR 300 Ω 1000pF 1k Ω 4 72 6 5 555 3 Equiva- lent 3.9k Ω 1k Ω 0.01 F µ 2SA561 7 6 12 13 9 10 IS1555 a 11 8 18 316 2 4 17 15 5 14 SI-7200M RSB RSA a : Trigger pulse for controlling the output current Pulse width : 2 s Frequency : 20 kHz 8 A A IO ICC µ SI-7200M Derating curve Ambient temperature Ta (°C) 40 20 060 80 16 14 12 10 8 6 4 2 0 SL-7200M Aluminum heatsink Using silicone grease Unit : mm 100 × 50 × 2 (6.5°C/W) Without heatsink SI-7200M Power dissipation vs. Output current 7 6 5 4 3 2 1 0 q w e VCC-1 q 40V w 30V e 20V Motor 6V 5 Ω/ 14mH/ No load 0 0.2 0.4 0.6 0.8 1.0 Output current IO (A) φ φ |
类似零件编号 - SI-7200M |
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类似说明 - SI-7200M |
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