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L7985 数据表(PDF) 36 Page - STMicroelectronics |
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L7985 数据表(HTML) 36 Page - STMicroelectronics |
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36 / 42 page  Application ideas L7985 36/42 DocID022446 Rev 7 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 44, where power losses across diodes and the internal power MOSFET are taken into account. Equation 44 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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