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LM-338K датащи(PDF) 7 Page - Linear Technology

номер детали LM-338K
подробное описание детали  5A Positive Adjustable Voltage Regulator
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производитель  LINER [Linear Technology]
домашняя страница  http://www.linear.com
Logo LINER - Linear Technology

LM-338K датащи(HTML) 7 Page - Linear Technology

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7
LT138A/LT338A
LM138/LM338
APPLICATIONS INFORMATION
negative side of the load. Although it may not be immedi-
ately obvious, best load regulation is obtained when the
top of the resistor divider, R1, is connected
directly to the
case
not to the load. This is illustrated in Figure 3. If R1
were connected to the load, the effective resistance be-
tween the regulator and the load would be:
R
RR
R
R
Parasitic Line
sis
ce
PP
21
1
+


=
,
Re
tan
Connected as shown, RP is not multiplied by the divider
ratio. RP is about 0.004Ω per foot using 16 gauge wire.
This translates to 4mV/ft at 1A load current, so it is
important to keep the positive lead between regulator and
load as short as possible, and use large wire or PC board
traces.
LT338A
RP
PARASITIC
LINE RESISTANCE
VIN
R1
CONNECT
R1 TO CASE
CONNECT
R2 TO LOAD
138A/338A F03
VOUT
ADJ
VIN
RL
R2
Figure 3. Connections for Best Load Regulation
TYPICAL APPLICATIONS
Improving Ripple Rejection
LT338A
VIN
R1
121
1%
R2
365
1%
1
µF
*C1 IMPROVES RIPPLE REJECTION, XC
SHOULD BE SMALL COMPARED TO R2
CL*
10
µF
138A/338A TA03
VOUT
ADJ
5V
VIN
+
+
1.2V to 25V Adjustable Regulator
LT338A
VIN
R1
240
C1*
1
µF
NEEDED IF DEVICE IS FAR FROM FILTER CAPACITORS
OPTIONAL, IMPROVES TRANSIENT RESPONSE
R2
5k
138A/338A TA04
VOUT
ADJ
VOUT
VIN
+
C2**
1
µF
*
**
+
VOUT = 1.25V
R2
R1
1 +
()


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