LM350 Fairchild Semiconductor, LM350 Datasheet - Page 5

• Manufacturer Part Number: LM350
• Description: The LM350 is an adjustable 3-terminal positive voltage regulator capable of supplying in excess of 3
• Manufacturer: Fairchild Semiconductor

Typical Application
C
C
In operation, the LM350 develops a nominal 1.25V reference voltage, V
reference voltage is impressed across program resistor R
through the output set resistor R
V
Since I
minimize I
the output establishing a minimum load current requirement. If there is insufficient load on the output, the output voltage will
rise. Since the LM350 is a floating regulator, it is only the voltage differential across the circuit which is important to
performance, and operation at high voltage with respect to ground is possible.
Since I
improved output impedance and rejection of transients.
I
O
O
: C
: Output capacitors in the range of 1μF to 100μF of aluminum or tantalum electronic are commonly used to provide
= 1.25V(1+R
I
ADJ
ADJ
is required if the regulator is located an appreciable distance from power supply filter.
ADJ
current (less than 100μA) from the adjustment terminal represents an error term, the LM350 was designed to
is controlled to less than 100μA, the error associated with this term is negligible in most applications.
and make it very constant with line and load changes. To do this, all quiescent operating current is returned to
Input
2
/R
1
) + I
ADJ
C
0.1uF
R
2
I
2
, giving an output voltage of
IN
I
ADJ
LM350
ADJ
1
Figure 13.
and, since the voltage is constant, a constant current I
OUT
REF
I
1
, between the output and adjustment terminal. The
R
120
R
1
2
C
1uF
O
Output
1
then flows
LM350
5