L78M12AC STMicroelectronics, L78M12AC Datasheet - Page 18

• Manufacturer Part Number: L78M12AC
• Description: Precision 500 mA regulators
• Manufacturer: STMicroelectronics

Applications information
Figure 19. Current boost regulator
Figure 20. Short-circuit protection
Note:
18/29
R
I
O
1
= I
= ______________
REG
I
REQ
+ Q
The circuit of
by adding a short-circuit sense resistor, R
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.
V
-(I
BEQ1
Q1
1
(I
/b
REG
Q1
)
______)
V
BEQ1
R
1
Figure 19
can be modified to provide supply protection against short-circuits
Doc ID 2147 Rev 12
SC
, and an additional PNP transistor. The current
L78MxxAB, L78MxxAC