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CD00000448 Fiches technique(PDF) 18 Page - STMicroelectronics

No de pièce CD00000448
Description  Precision 500 mA regulators
Download  31 Pages
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

CD00000448 Fiches technique(HTML) 18 Page - STMicroelectronics

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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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