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LM117JAN Fiches technique(PDF) 2 Page - Texas Instruments

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No de pièce LM117JAN
Description  LM117JAN 3-Terminal Adjustable Regulator
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Fabricant  TI1 [Texas Instruments]
Site Internet  http://www.ti.com
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LM117JAN
3-Terminal Adjustable Regulator
General Description
The LM117 adjustable 3-terminal positive voltage regulator
is capable of supplying either 0.5A or 1.5A over a 1.2V to
37V output range. It is exceptionally easy to use and re-
quires only two external resistors to set the output voltage.
Further, both line and load regulation are better than stan-
dard fixed regulators.
In addition to higher performance than fixed regulators, the
LM117 series offers full overload protection available only in
IC’s. Included on the chip are current limit, thermal overload
protection and safe area protection. All overload protection
circuitry remains fully functional even if the adjustment ter-
minal is disconnected.
Normally, no capacitors are needed unless the device is
situated more than 6 inches from the input filter capacitors in
which case an input bypass is needed. An optional output
capacitor can be added to improve transient response. The
adjustment terminal can be bypassed to achieve very high
ripple rejection ratios which are difficult to achieve with stan-
dard 3-terminal regulators.
Besides replacing fixed regulators, the LM117 is useful in a
wide variety of other applications. Since the regulator is
“floating” and sees only the input-to-output differential volt-
age, supplies of several hundred volts can be regulated as
long as the maximum input to output differential is not ex-
ceeded, i.e., avoid short-circuiting the output.
Also, it makes an especially simple adjustable switching
regulator, a programmable output regulator, or by connecting
a fixed resistor between the adjustment pin and output, the
LM117 can be used as a precision current regulator. Sup-
plies with electronic shutdown can be achieved by clamping
the adjustment terminal to ground which programs the out-
put to 1.2V where most loads draw little current.
For the negative complement, see LM137 series data sheet.
Features
n
Guaranteed 0.5A or 1.5A output current
n
Adjustable output down to 1.2V
n
Current limit constant with temperature
n
80 dB ripple rejection
n
Output is short-circuit protected
Ordering Information
NS Part Number
JAN Part Number
NS Package Number
Package Description
JL117BXA
JM38510/11703BXA
H03A
3LD T0–39 Metal Can
JL117SXA
JM38510/11703SXA
H03A
3LD T0–39 Metal Can
JL117BYA
JM38510/11704BYA
K02C
2LD T0–3 Metal Can
JL117SYA
JM38510/11704SYA
K02C
2LD T0–3 Metal Can
Connection Diagrams
(TO-3)
Metal Can Package
(TO-39)
Metal Can Package
20149030
CASE IS OUTPUT
Bottom View
Steel Package
NS Package Number K02C
20149031
CASE IS OUTPUT
Bottom View
NS Package Number H03A
March 2006
© 2006 National Semiconductor Corporation
DS201490
www.national.com


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