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LM323_02 Datasheet(PDF) 3 Page - ON Semiconductor

Part No. LM323_02
Description  3.0 A Positive Voltage Regulators
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Maker  ONSEMI [ON Semiconductor]
Homepage  http://www.onsemi.com
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LM323, LM323A
http://onsemi.com
3
1.0k
Q2
Q1
Q20
210
Q21
100
Q22
6.7V
16k
Q9
Q8
300
Q3
10k
Q4
Q5
Q10
1.0k
Q24
200
Q25
Q27
Q26
3.0k
5.6k
Q16
Q19
10pF
Q23
300
13
0.12
200
Output
50
520
Q12
2.6k
2.0k 3.9k
Q13
Q14
6.0k
Q11
Q6
Q7
40pF
Q15
2.8k
7.2k
840
1.7k
Gnd
Input
2
1.0k
6.0k
Representative Schematic Diagram
Q17
Q18
VOLTAGE REGULATOR PERFORMANCE
The performance of a voltage regulator is specified by its
immunity to changes in load, input voltage, power
dissipation, and temperature. Line and load regulation are
tested with a pulse of short duration (< 100
µs) and are
strictly a function of electrical gain. However, pulse widths
of longer duration (> 1.0 ms) are sufficient to affect
temperature gradients across the die. These temperature
gradients can cause a change in the output voltage, in
addition to changes by line and load regulation. Longer
pulse widths and thermal gradients make it desirable to
specify thermal regulation.
Thermal regulation is defined as the change in output
voltage caused by a change in dissipated power for a
specified time, and is expressed as a percentage output
voltage change per watt. The change in dissipated power
can be caused by a change in either input voltage or the load
current. Thermal regulation is a function of IC layout and
die attach techniques, and usually occurs within 10 ms of
a change in power dissipation. After 10 ms, additional
changes in the output voltage are due to the temperature
coefficient of the device.
Figure 1 shows the line and thermal regulation response
of a typical LM323A to a 20 W input pulse. The variation
of the output voltage due to line regulation is labeled À and
the thermal regulation component is labeled Á. Figure 2
shows the load and thermal regulation response of a typical
LM323A to a 20 W load pulse. The output voltage variation
due to load regulation is labeled À and the thermal
regulation component is labeled Á.
2
1
2
1
Figure 1. Line and Thermal Regulation
Figure 2. Load and Thermal Regulation
Vout = 5.0 V
Vin = 8.0 V → 18 V → 8.0 V
Iout = 2.0 A
= Regline = 2.4 mV
t, TIME (2.0 ms/DIV)
1
2
18 V
8.0 V
2
Vout = 5.0 V
Vin = 15 V
Iout = 0 A → 2.0 A → 0 A
= Regline = 5.4 mV
t, TIME (2.0 ms/DIV)
1
2
2.0
0
= Regtherm = 0.0015% VO/W
= Regtherm = 0.0015% VO/W
2




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