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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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A7985ATR датащи(PDF) 39 Page - STMicroelectronics |
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A7985ATR датащи(HTML) 39 Page - STMicroelectronics |
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39 / 44 page  DocID023128 Rev 5 39/44 A7985A Application ideas 44 Figure 36. Inverting buck-boost regulator The GND pin of the device is connected to the output voltage so, given the output voltage, the input voltage range is limited by the maximum voltage the device can withstand across VCC and GND (38 V). Therefore, if the output is -5 V, the input voltage can range from 4.5 V to 33 V. As in the positive buck-boost, the maximum output current according to application conditions is shown in Figure 37. The dashed line considers a more accurate estimation of the duty cycles given by Equation 47, where power losses across diodes and the internal Power MOSFET are taken into account. Equation 47 Figure 37. Maximum output current according to switch max. peak current (2.0 A): VO = -5 V D VOUT VD – V – IN VSW VOUT VD – + – ----------------------------------------------------------------- = |
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