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LM317LBZ Datasheet(Hoja de datos) 9 Page - ON Semiconductor

No. de Pieza. LM317LBZ
Descripción  100 mA Adjustable Output, Positive Voltage Regulator
Descarga  12 Pages
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Fabricante  ONSEMI [ON Semiconductor]
Página de inicio  http://www.onsemi.com
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LM317L
http://onsemi.com
9
Protection Diodes
When external capacitors are used with any IC regulator
it is sometimes necessary to add protection diodes to prevent
the capacitors from discharging through low current points
into the regulator.
Figure 14 shows the LM317L with the recommended
protection diodes for output voltages in excess of 25 V or
high capacitance values (CO > 10
mF, CAdj > 5.0 mF). Diode
D1 prevents CO from discharging thru the IC during an input
short circuit. Diode D2 protects against capacitor CAdj
discharging through the IC during an output short circuit.
The combination of diodes D1 and D2 prevents CAdj from
discharging through the IC during an input short circuit.
D1
Vin
Cin
1N4002
LM317L
Vout
R1
+
CO
D2
R2
CAdj
1N4002
Adjust
Figure 18. Voltage Regulator with
Protection Diodes
Figure 19. Adjustable Current Limiter
Figure 20. 5.0 V Electronic Shutdown Regulator
Figure 21. Slow Turn−On Regulator
Figure 22. Current Regulator
Vref
+25V
Vin
LM317L
Vout
R1
VO
1.25k
Adjust
IO
D2
1N914
1N5314
R2
500
* To provide current limiting of IO
to the system ground, the source of
the current limiting diode must be tied to
a negative voltage below − 7.25 V.
R2
Vref
R1 =
VSS*
D1
1N914
VO < POV + 1.25 V + VSS
ILmin − IP < IO < 100 mA − IP
As shown O < IO < 95 mA
+
10
mF
Vin
Vout
240
1N4002
LM317L
Adjust
MPS2907
R2
50k
Vin
D1
1N4002
Vout
120
Adjust
720
+
1.0
mF
MPS2222
1.0k
TTL
Control
LM317L
Minimum Vout = 1.25 V
D1 protects the device during an input short circuit.
LM317L
Vin
R1
R2
Adjust
IAdj
Iout
Ioutmax =
Vref
+ IAdj ^
5.0 mA < Iout < 100 mA
Vout
1.25 V
Ioutmax =
Vref
+ IAdj ^
1.25 V
IDSS
IOmax + IDSS
R1
R1 + R2
R1
R1 + R2




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