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A5975D Datasheet(PDF) 39 Page - STMicroelectronics |
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A5975D Datasheet(HTML) 39 Page - STMicroelectronics |
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39 / 50 page  A5975D Application information Doc ID 018760 Rev 1 39/50 Equation 40 Equation 41 An important point to take into account is that the ground pin of the device is connected to the negative output voltage. Therefore, the device is subjected to a voltage equal to VIN-VO, which must be lower than 36 V (the maximum operating input voltage). Figure 27. Negative buck-boost regulator 8.9 Floating boost current generator The A5975D does not support a nominal boost conversion as this topology requires a low side switch, however, a floating boost can be useful in applications where the load can be floating. A typical example is a current generator for LED driving, as the LED does not require a connection to the ground. Figure 28. Floating boost topology D 5 512 + ---------------- 0.706 == I SW I LOAD 1D – --------------- 0.5 10.706 – ------------------------ 1.7A == = AM09693v1 10V A5975D 4.7 6.8 6 470 ESR>35m Ω |
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