L78M12ABDT-1 STMicroelectronics, L78M12ABDT-1 Datasheet - Page 18

• Manufacturer Part Number: L78M12ABDT-1
• Description: Linear Regulators - Standard 12V 0.5A Positive
• Manufacturer: STMicroelectronics

Specifications of L78M12ABDT-1

• Polarity: Positive
• Number Of Outputs: 1
• Output Type: Fixed
• Output Voltage: 12 V
• Output Current: 0.5 A
• Line Regulation: 100 mV
• Load Regulation: 240 mV
• Dropout Voltage (max): 2 V
• Input Voltage Max: 35 V
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 40 C
• Package / Case: TO-251
• Mounting Style: Through Hole
• Voltage Regulation Accuracy: 2 %
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

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
Figure 19
1
can be modified to provide supply protection against short-circuits
Doc ID 2147 Rev 9
SC
, and an additional PNP transistor. The current