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L78M09AB Datasheet(PDF) 18 Page - STMicroelectronics |
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L78M09AB Datasheet(HTML) 18 Page - STMicroelectronics |
18 / 31 page Applications information L78MxxAB, L78MxxAC 18/31 Doc ID 2147 Rev 13 Note: The circuit of Figure 19 can be modified to provide supply protection against short-circuits by adding a short-circuit sense resistor, RSC, and an additional PNP transistor. The current sensing PNP must be able to handle the short-circuit current of the three-terminal regulator. Therefore, a four ampere plastic power transistor is specified. Figure 19. Current boost regulator IO = IREG + Q1 (IREG ______) VBEQ1 R1 R1 = ______________ VBEQ1 IREQ-(IQ1/bQ1) Figure 20. Short-circuit protection |
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