LM350K STMicroelectronics, LM350K Datasheet - Page 8
![IC VOLTAGE REG ADJ 3A TO-3](/photos/5/70/57065/to-3_sml.jpg)
LM350K
Manufacturer Part Number
LM350K
Description
IC VOLTAGE REG ADJ 3A TO-3
Manufacturer
STMicroelectronics
Datasheet
1.LM350K.pdf
(14 pages)
Specifications of LM350K
Regulator Topology
Positive Adjustable
Voltage - Output
1.2 ~ 25 V
Number Of Regulators
1
Current - Output
3A
Current - Limit (min)
3A
Operating Temperature
0°C ~ 125°C
Mounting Type
Through Hole
Package / Case
TO-204, TO-3
Polarity
Positive
Number Of Outputs
1
Output Type
Adjustable
Output Voltage
1.2 V to 25 V
Output Current
3 A
Line Regulation
0.03 % / V
Load Regulation
0.5 %
Input Voltage Max
35 V
Maximum Operating Temperature
+ 125 C
Minimum Operating Temperature
0 C
Maximum Power Dissipation
30000 mW
Mounting Style
Through Hole
Reference Voltage
1.29 V
Voltage Regulator Type
Linear
Topology
Standard
Regulator Output Type
Adjustable
Polarity Type
Positive
Package Type
TO-3
Power Dissipation
30W
Operating Temp Range
0C to 125C
Operating Temperature Classification
Commercial
Pin Count
2 +Tab
Mounting
Through Hole
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Voltage - Input
-
Voltage - Dropout (typical)
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Other names
497-2982-5
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
LM350K STEEL/NOPB
Manufacturer:
National Semiconductor
Quantity:
135
6
Figure 4.
6.1
8/14
Application hints
In operation, the LM350 develops a nominal 1.25 V reference voltage, V
output and adjustment terminal. The reference voltage is impressed across program resistor
R
resistor R
V
Circuit
Since the 50 µA current from the adjustment terminal represents an error term, the LM350
was designed to minimize I
this, all quiescent operating current is returned to the output establishing a minimum load
current requirement. If there is insufficient load on the output, the output will rise.
External capacitors
An input bypass capacitor is recommended. A 0.1 µF disc or 1 µF solid tantalum on the input
is suitable input by passing for almost all applications. The device is more sensitive to the
absence of input bypassing when adjustment or output capacitors are used by the above
values will eliminate the possibility of problems.
The adjustment terminal can be bypassed to ground on the LM350 to improve ripple
rejection. This bypass capacitor prevents ripple form being amplified as the output voltage is
increased. With a 10 µF bypass capacitor 75 dB ripple rejection is obtainable at any output
level. Increases over 20 µF do not appreciably improve the ripple rejection at frequencies
above 120 Hz. If the bypass capacitor is used, it is sometimes necessary to include
protection diodes to prevent the capacitor from discharging through internal low current
paths and damaging the device.
In general, the best type of capacitors to use are solid tantalum. Solid tantalum capacitors
have low impedance even at high frequencies. Depending upon capacitor construction, it
takes about 25 µF in aluminium electrolytic to equal 1 µF solid tantalum at high frequencies.
Ceramic capacitors are also good at high frequencies, but some types have a large
O
1
and, since the voltage is constant, a constant current I
= V
(REF)
2
, giving an output voltage of:
(1+ R
2
/ R
1
) + I
ADJ
ADJ
and make it very constant with line and load changes. To do
x R
2
.
1
then flows through the output set
(REF)
, between the