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LM217M-LM217MDT-TR-LM317MDT-TR
MEDIUM CURRENT1.2 TO 37V ADJUSTABLE VOLTAGE REGULATORS
1/11January 2004 OUTPUT VOLTAGE RANGE: 1.2 TO 37V OUTPUT CURRENTIN EXCESS OF 500 mA LINE REGULATION TYP. 0.01% LOAD REGULATION TYP. 0.1% THERMAL OVERLOAD PROTECTION SHORT CIRCUIT PROTECTION OUTPUT TRANSITION SAFE AREA
COMPENSATION FLOATING OPERATION FOR HIGH
VOLTAGE APPLICATIONS
DESCRIPTIONThe LM217M/LM317M are monolithic integrated
circuitsin TO-220 and DPAK packages intended
for useas positive adjustable voltage regulators.
They are designedto supply until 500 mAof load
current with an output voltage adjustable overa
1.2to 37V range.
The nominal output voltageis selectedby means onlya resistive divider, making the device
exceptionally easyto use and eliminating the
stockingof many fixed regulators.
LM217M
LM317MMEDIUM CURRENT
1.2 TO 37V ADJUSTABLE VOLTAGE REGULATOR
SCHEMATIC DIAGRAM
LM217M/LM317M2/11
ABSOLUTE MAXIMUM RATINGS(*) Re-Bootisnot guaranteedforTJ ≥ 85°C.
THERMAL DATA
CONNECTION DIAGRAM (top view)
ORDERING CODES(*) Availablein Tape& Reel withthe suffix "-TR".
TEST CIRCUIT
LM217M/LM317M3/11
ELECTRICAL CHARACTERISTICS OF LM217M (referto the test circuits,TJ=-40to 125°C, -VO =5V,IO= 100 mA,Pd≤ 7.5 W, unless otherwise specified).
(*) CADJis connected between Adjustpinand Ground.
ELECTRICAL CHARACTERISTICS OF LM317M (referto the test circuits,TJ=0to 125°C,I -VO =5V,IO= 100 mA,Pd≤ 7.5 W, unless otherwise specified).
(*) CADJis connected between Adjustpinand Ground.
LM217M/LM317M4/11
Figure1: Current Limit
Figure2: Minimum Operating Current
Figure3: Basic Adjustable Regulator
Figure4: Thermal Resistance& Maximum Power Dissipationvs P.C.B. Copper Lengthfor DPAK
Pdmax calculatedforTa =50°C.
LM217M/LM317M5/11
APPLICATION INFORMATIONThe LM217M/LM317M provide an internal
reference voltageof 1.25V between the output
and adjustment terminals. These devices are
usedto seta constant current flow across an
external resistor divider (see fig. 3), giving an
output voltage VO of: VO =VREF(1+ R2 /R1)+
IADJ R2
The devices were designedto minimize the term ADJ (100µA max) andto maintainit very constant line and load changes. Usually, the error term
IADJ×R2 canbe neglected.To obtain the previous
requirement,all the regulator quiescent currentis
returned to the output terminal, imposinga
minimum load current condition.If the loadis
insufficient, the output voltage will rise.
Since the LM217M/LM317M devices are floating
regulators and "see" only the input-to-output
differential voltage, suppliesof very high voltage
with respectto ground canbe regulatedas longas
the maximum input-to-output differentialis not
exceeded. Furthermore, programmable regulators
are easily obtained and, by connectinga fixed
resistor between the adjustment and output, the
devices can be used asa precision current
regulator.In orderto optimize the load regulation,
the current set resistorR1 (see fig.3) should be
tiedas closeas possibleto the regulator, while the
ground terminalof R2 should be near the ground the loadto provide remote ground sensing.
EXTERNAL CAPACITORS (Fig.5)Normally no capacitors are needed unless the
devices are situated far from the input filter
capacitors;in which case an input bypassis
needed. 0.1µF disc or 1µF tantalum input bypass
capacitor (CI)is recommended to reduce the
sensitivityto input line impedance.
The adjustment terminal may be bypassed to
groundto improve ripple rejection. This capacitor
(Cadj) prevents ripple from being amplifiedas the
output voltageis increased.A 10µF capacitor
should improve ripple rejectionof about 80dBat
120Hzina 10V application.
Although the LM217M/LM317M devices are
stable with no output capacitance like any
feedback circuit, certain values of external
capacitance can cause excessive ringing. An
output capacitance (CO)in the formofa 1µF
tantalumor 25µF aluminium electrolytic capacitor the output swamps this effect and insures
stability.
PROTECTION DIODES (Fig.5)When external capacitors are used with any IC
regulatorit is sometimes necessary to add
protection diodesto prevent the capacitors from
discharging through low current points into the
regulator.
Figure5 shows the LM217M/LM317M with the
recommended protection diodes for output
voltagesin excessof 25Vor high capacitance
values (C3> 25µF,C2> 10µF). Diode D1 prevents3 from discharging through theIC duringan input
short-circuit. The combinationof diodes D1 and prevents C2 from discharging through the
regulator duringan inputor output short-circuit.
START-UP BLOCKIt’s not guaranteed the Re-Bootof the device
when the junction temperatureis over 85°C.
LM217M/LM317M6/11
Figure5: Voltage Regulator with Protection Diodes
Figure6: Slow Turn-on 15V Regulator
Figure7: Current Regulator
