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LM317LF Scheda tecnica(PDF) 4 Page - Tiger Electronic Co.,Ltd

Il numero della parte LM317LF
Spiegazioni elettronici  3-TERMINAL ADJUSTABLE REGULATOR
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Produttore elettronici  TGS [Tiger Electronic Co.,Ltd]
Homepage  http://www.tgselec.com
Logo TGS - Tiger Electronic Co.,Ltd

LM317LF Scheda tecnica(HTML) 4 Page - Tiger Electronic Co.,Ltd

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LM317
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APPLICATION INFORMATION
1. Basic circuit operation
In operation, the LM 317 develops a nominal 1.25V reference voltage, Vref, between
the output and adjustme nt terminal. The reference voltage is impressed across program
resistor R1 and, since the voltage is constant, a constant current I1 then flows through
the output set resistor R2, giving an output voltage of
V o u t = V r e f ( 1 + R 2 / R 1 ) + I a d j * ( R 2 )
Since the 100
µA current from the adjustment
terminal represents an error term, the LM 317
was designed to mi nimi ze Iadj and ma ke it very
constant with line and load changes. To do this,
all quiescent operating current is returned to the
output establishing a mi nimu m load current
requireme nt. If there is insufficient load on the
output, the output will rise.
Figure: Basic circuit configuration
R1
R2
LL
V
V
ADJ
I
V
I
V
AD
J
1
RE
OU
IN
OU
2. Load Regulation
The LM 31 7 is cap ab le of pro v i d in g extre m ely good load re gu latio n, b u t a few
precaut i ons
are
nee d ed
to
obt a in
ma xi m u m
performance.
For
best
performa nce,
the
programmi ng resistor (R1) shoul d be co nne cted
as
clos e
to
t h e
regula t or
as
possi ble
t o
m i ni mi ze line drops which effecti v ely appear in
series with the reference, t h ere b y degradi n g
regulat io n.
The
gro und
end
of
R2
ca n
b e
returned ne ar the loa d groun d to p r ovide rem o te
groun d se n s ing an d i m prove loa d reg u la tio n
Reg u lat o r with li ne resistance
i n
o u t p u t l e a d
R1
R2
LM317L
V
V
ADJ
V
OUT
IN
OUT
Rs
240
VIN
W317L
W317L
3.External capacitors
A 0 . 1
µF disc or 1.0µF tantalum input bypass capacitor (Cin) is recommended to
reduce the sensitivity to input line impedance.
T h e ad j u stme nt term inal ma y be by passe d to gro u n d to impro v e ripp le rejecti o n .
This ca paci tor (Cadj) prevents ri pple from bein g amplified as t h e out pu t v o lta ge is
increase d . A 10
µF capacitor should improve ripple rejection about 15dB at 120Hz in a


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