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PM6641 数据表(PDF) 27 Page - STMicroelectronics |
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PM6641 数据表(HTML) 27 Page - STMicroelectronics |
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27 / 47 page  PM6641 Device description 27/47 7.5 Output voltage divider PM6641 switching regulators are adjustable voltage converters. If the feedback pin (VFB_1S8, VFB_1S5, VFB_1S05 respectively belonging to VDDQ (1.8 V), 1.5 V, 1.05 V rail) is directly tied to the rail output capacitor the internal divider with pre-fixed output voltage value is activated and the nominal output voltages are selected. If the feedback pin is connected to the output voltage divider central tap (as depicted in Figure 30 ) Figure 30. SW regulator with external divider the PM6641 switching regulator automatically recognizes the external divider and the output voltage is regulated to the following value: Equation 5 Vout_1Sxx VFB_1Sxx R 1 R 2 V 8 . 0 1 R R Sxx 1 _ Vout 2 1 ⋅ ⎟⎟ ⎠ ⎞ ⎜⎜ ⎝ ⎛ + = |
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