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LM-338K Datasheet(Fiches technique) 5 Page - Linear Technology

Numéro de pièce LM-338K
Description  5A Positive Adjustable Voltage Regulator
Télécharger  12 Pages
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Fabricant  LINER [Linear Technology]
Site Internet  http://www.linear.com
Logo LINER - Linear Technology

LM-338K Datasheet(HTML) 5 Page - Linear Technology

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LT138A/LT338A
LM138/LM338
TYPICAL PERFOR A CE CHARACTERISTICS
Current Limit
Current Limit
Current Limit
INPUT-OUTPUT DIFFERENTIAL (V)
0
8
12
40
138A/338A G10
4
0
10
20
30
16
PEAK CURRENT LIMIT
DC CURRENT LIMIT
TCASE = 25°C
PRELOAD = 0A
PRELOAD = 1A
PRELOAD = 5A
TIME (ms)
0.1
8
10
12
14
1
10
100
138A/338A G11
6
4
2
0
PRELOAD = 0A
PRELOAD = 5A
VIN = 10V
VOUT = 5V
TCASE = 25°C
TIME (ms)
0.1
8
10
12
14
1
10
100
138A/338A G12
6
4
2
0
PRELOAD CURRENT = 0
TCASE = 25°C
VIN – VOUT = 10V
VIN – VOUT = 15V
VIN – VOUT = 20V
VIN – VOUT = 30V
Line Transient Response
TIME (
µs)
0
0
0.5
–1.5
–1.0
– 0.5
20
30
1.5
138A/338A G13
1.0
10
40
0
0.5
1.0
CL = 1µF
CL = 10µF
COUT = 0
CADJ = 0
VOUT = 10V
IOUT = 50mA
TJ = 25°C
Load Transient Response
TIME (
µs)
0
2
6
–3
–2
3
0
20
40
138A/338A G14
4
1
2
–1
010
30
VIN = 15V
VOUT = 10V
TCASE = 25°C
PRELOAD = 100mA
CL = 1µF
CADJ = 10µF
CL = 0
CADJ = 0
APPLICATIONS INFORMATION
General
The LT138A develops a 1.25V reference voltage between
the output and the adjustable terminal (see Figure 1). By
placing a resistor, R1, between these two terminals, a con-
stant current is caused to flow through R1 and down through
R2 to set the overall output voltage. Normally this current
is the specified minimum load current of 5mA or 10mA.
Because IADJ is very small and constant when compared
with the current through R1, it represents a small error and
can usually be ignored. It is easily seen from the output
voltage equation, that even if the resistors were of exact
value, the accuracy of the output is limited by the accuracy
of VREF. Earlier adjustable regulators had a reference
tolerance of
±4% which is dangerously close to the ±5%
supply tolerance required in many logic and analog sys-
tems. Further, even 1% resistors can drift 0.01%/
°C, add-
ing additional error to the output voltage tolerance.
Figure 1. Basic Adjustable Regulator
LT338A
VIN
R1
138A/338A F01
VOUT
IADJ
50
µA
ADJ
VREF
VOUT
VIN
R2
VOUT = VREF
R2
R1
1 +
+ IADJ • R2
()
+


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