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LM317L bảng dữ liệu(PDF) 11 Page - Texas Instruments

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R1 =
470 Ω
R2 = 5.1 kΩ
C1 = 25 µF
2N2905
R3 = 50 kΩ
1N4002
VO = 15 V
VI
LM317L
Adjustment
Output
Input
R3 = 240 Ω
VI
C1 = 0.1 µF
C2 = 1 µF
Output
Adjust
VO
R2 = 1.5 kΩ
R1 = 470 Ω
LM317L
R4 = 2 kΩ
Adjustment
Output
Input
LM317L
Adjustment
Output
Input
LM317L
www.ti.com
SLCS144E – JULY 2004 – REVISED OCTOBER 2014
General Configurations (continued)
9.3.4 Tracking Preregulator Circuit
The tracking preregulator circuit application keeps a constant voltage across the second LM317L in the circuit.
Figure 6. Tracking Preregulator Circuit
9.3.5 Slow-Turn On 15-V Regulator Circuit
The capacitor C1, in combination with the PNP transistor, helps the circuit to slowly start supplying voltage. In the
beginning, the capacitor is not charged. Therefore, output voltage will start at 1.9 V, as determined by
Equation 5. As the capacitor voltage rises, VOUT will rise at the same rate. When the output voltage reaches the
value determined by R1 and R2, the PNP will be turned off.
VC1 + VBE + 1.25 V = 0 V + 0.65 V + 1.25 V = 1.9 V
(5)
Figure 7. Slow-Turn On 15-V Regulator Circuit
Copyright © 2004–2014, Texas Instruments Incorporated
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