LM340_16 Datasheet, PDF (15/33 Pages) Texas Instruments – 1.5-A Fixed Voltage Regulators

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LM340, LM340A, LM7805, LM7812, LM7815
SNOSBT0K – FEBRUARY 2000 – REVISED JULY 2016
Typical Applications (continued)
8.2.1.2 Detailed Design Procedure
The output voltage is set based on the device variant. LM340x and LM78xx are available in 5-V, 12-V and 15-V
regulator options.
8.2.1.3 Application Curve
8.3 System Examples
Figure 19. V_OUT vs V_IN, V_OUT = 5 V
I_OUT = V2–3 / R1 + I_Q
ΔI_Q = 1.3 mA over line and load changes.
Figure 20. Current Regulator
INPUT
V_I
0.22 PF
OUTPUT
V_O
GND
0.1 PF
V_OUT = 5 V + (5 V/R1 + I_Q) R2 5 V/R1 > 3 I_Q,
load regulation (L_r) ≈ [(R1 + R2)/R1] (L_r of LM340-5).
Figure 21. Adjustable Output Regulator
INPUT
OUTPUT
V_I
V_O
0.22 PF
GND
0.1 PF
Figure 22. High Input Voltage Circuit With Series
Resistor
Figure 23. High Input Voltage Circuit
implementation With Transistor
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Product Folder Links: LM340 LM340A LM7805 LM7812 LM7815