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A5974D Datasheet(PDF) 30 Page - STMicroelectronics |
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A5974D Datasheet(HTML) 30 Page - STMicroelectronics |
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30 / 46 page  Application information A5974D 30/46 DocID018774 Rev 2 8.4 R.M.S. current of the embedded Power MOSFET As the A5974D device embeds the high-side switch and so the internal power dissipation is sometimes the bottleneck for the output current capability (refer to Section 8.3 on page 24 for the estimation of the operating temperature). Nevertheless, as mentioned in Description on page 1, the device can manage a continuous output current of 2.5 A in most of the application conditions. However the rated maximum RMS current of the power elements is 2 A, where: Equation 31 and the real duty cycle D: Equation 32 Fixing the limit of 2 A for IRMS HS the maximum output current can be derived, as illustrated in Figure 18.. Figure 18. Maximum continuous output current vs. duty cycle IRMS HS ILOAD D = D VOUT RDS ON LS DCR + I LOAD + VIN RDS ON LS RDS ON HS – I LOAD + ---------------------------------------------------------------------------------------------------- = |
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