L78M00AB View Datasheet(PDF) - STMicroelectronics

Part Name

Description

MFG CO.

L78M00AB

PRECISION 500mA REGULATORS

STMicroelectronics 

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Figure 15 : Current Boost Regulator

R1 = IREVQBE-QβI1QQ11

IO = IREG + Q1 (IREG VBRE1Q1)

Figure 16 : Short-Circuit Protection

L78M00AB/AC SERIES

The circuit of figure 6 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. There-

fore, a four-ampere plastic power transistor is specified.

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