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LM317LCD Folha de dados(PDF) 9 Page - Texas Instruments

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Nome de Peças LM317LCD
Descrição Electrónicos  3-Terminal Adjustable Regulator
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Fabricante Electrônico  TI1 [Texas Instruments]
Página de início  http://www.ti.com
Logo TI1 - Texas Instruments

LM317LCD Folha de dados(HTML) 9 Page - Texas Instruments

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VI VO (V)
0
6.25
12.5
18.75
25
31.25
37.5
42.5
1.2
1.22
1.24
1.26
1.28
1.3
D001
40GC
0GC
25GC
125GC
2
OUT
REF
ADJ
2
1
R
V
V
1
(I
R )
R
æ
ö
=
´
+
+
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LM317L
www.ti.com
SLCS144E – JULY 2004 – REVISED OCTOBER 2014
9.2.2.4 Adjustment Terminal Capacitor
The optional adjustment pin capacitor will improve ripple rejection by preventing the amplification of the ripple.
When capacitor is used and VOUT > 6 V, a protection diode from adjust to output is recommended.
9.2.2.5 Design Options and Parameters
Common Linear Regulator designs are concerned with the following parameters:
Input voltage range
Input capacitor range
Output voltage
Output current rating
Output capacitor range
Input short protection
Stability
Ripple rejection
9.2.2.6 Output Voltage
VO is calculated as shown in Equation 3.
(3)
Because IADJ typically is 50 µA, it is negligible in most applications.
9.2.2.7 Ripple Rejection
CADJ is used to improve ripple rejection; it prevents amplification of the ripple as the output voltage is adjusted
higher. If CADJ is used, it is best to include protection diodes.
9.2.2.8 Input Short Protection
If the input is shorted to ground during a fault condition, protection diodes provide measures to prevent the
possibility of external capacitors discharging through low-impedance paths in the IC. By providing low-impedance
discharge paths for CO and CADJ, respectively, D1 and D2 prevent the capacitors from discharging into the output
of the regulator.
9.2.3 Application Curves
Figure 2. Adjustment Voltage Relative to Output Over Temperature
Copyright © 2004–2014, Texas Instruments Incorporated
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