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SI-7500A Datenblatt(PDF) 3 Page - Sanken electric |
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SI-7500A Datenblatt(HTML) 3 Page - Sanken electric |
3 / 4 page 45 SI-7500A Application Note s Determining the output current IO (motor coil current) The main elements that determine the output current are Current detection resistor Rs, Supply voltage Vb, and Vari- able current resistor RX. (1) Normal mode To operate a motor at maximum current level, set RX to infinity (open). From Fig. A, when the maximum output current ripple is designated as IOH, its value will be, VRSH IOH = ....................................................... [A] RS VRSH can be computed as follows: VRSH = 0.2 Vb + 0.213 (center value) .............. [B] From equations [A] and [B], the output current IOH can be computed as follows: I IOH = (0.2 Vb + 0.213) RS The relationship between IOH and RS is shown in Fig. B. (2) Power down mode When an external resistor RX is connected, VRSH changes as shown in the Fig. B even when RS is retained. Obtain the power down output current IOHPD from Fig. B and equation [A]. s Thermal design Obtain the internal power dissipation that corresponds to the output current to be required from Fig. C, multiply this by three, and determine the size of the heatsink from the derating curve in Fig. D. The derating curve is based on junction temperature of 125 °C. However, make some allowance so that Tc is 85°C or less and then select the proper heatsink size. Fig. C SI-7500A Internal power dissipation per phase PD vs. Output current IO Fig. D SI-7500A Derating curve Fig. B VRSH Max. (Vb = 5.0V) VRSH Min. (Vb = 5.0V) VRSH(max) = + 0.2 (V) Vb + 0.1 4.69 + 1.92 Rx VRSH(min) = + 0.15 (V) Vb + 0.09 5.25 + 2.06 Rx (Rx : k Ω) 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0 0 1234 ∞ External resistor Rx (k Ω) Waveform of output current Fig. A IOH Motor : PH566-B Vb = 5V Holding mode VCC = 30V 24V 20V 6 5 4 3 2 1 0 0 0.2 0.4 0.6 0.8 1.0 1.2 Output current lo (A) (Typical value) 150 × 100 100 × 100 50 × 100 Without heatsink 20 15 10 5 0 Heatsink : Aluminum Thickness : 2 mm 0 204060 80 Ambient temperature Ta (°C) |
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