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L99PM72GXP Datasheet(PDF) 15 Page - STMicroelectronics |
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L99PM72GXP Datasheet(HTML) 15 Page - STMicroelectronics |
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15 / 129 page  DocID024767 Rev 4 15/129 L99PM72GXP Detailed description 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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