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L99PM72PXP Datasheet(PDF) 15 Page - STMicroelectronics |
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L99PM72PXP Datasheet(HTML) 15 Page - STMicroelectronics |
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15 / 128 page  L99PM72PXP Detailed description Doc ID 023553 Rev 3 15/128 The circuit in Figure 4 provides additional current limitation using an additional PNP transistor and R6, which allows setting the current limit. Figure 5. Voltage source with external NPN Figure 6. Voltage source with external NPN and current limitation Figure 5 shows a possible configuration with an NPN pass element using Voltage Regulator 2 to provide the voltage reference for the regulated output voltage V3. This circuit requires fewer components compared to the configuration in Figure 3 but has a limited VS operating range (6 V to 18 V). The output voltage V3 can be calculated using the following formula (for R3 = R4): The circuit in Figure 6 provides additional current limitation using an additional NPN transistor and R5 which allows setting the current limit. V 3 V 2 2 ------- R 1 R 2 + R 2 --------------------- V = |
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