LM317LILPR datasheet(9/29 Pages) TI1

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VI VO (V)

6.25

12.5

18.75

31.25

37.5

42.5

1.2

1.22

1.24

1.26

1.28

1.3

D001

40GC

0GC

25GC

125GC

OUT

REF

ADJ

R )

LM317L

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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

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