Datasheet

to improve the ripple rejection of about 15 dB
(C
ADJ
).
An 1µF tantalium (or 25µFAluminium electrolitic)
capacitor on the output to improve transient
response.
In additional to external capacitors, it is good
practice to add protection diodes, as shown in
fig.5.
D1 protect the device against input short circuit,
while D2 protect against output short circuit for
capacitancedischarging.
Figure 5 : Voltage Regulator with Protection Diodes.
D1 protect the device against input short circuit, while D2 protects against output short circuit for capacitors discharging
Figure 6 : Slow Turn-on 15V Regulator. Figure 7 : Current Regulator.
I
o
=
V
ref
R
1
+ I
ADJ
≈
1.25
V
R
1
LM117/217/317
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