Typical Applications
(Continued)
Wide Range Tracking Regulator
TL/H/7767–7
*
Resistor tolerance of R1 and R2 determine matching of (
a
) and (
b
)
inputs.
**
Necessary only if raw supply capacitors are more than 3
×
from regulators
An LM3086N array may substitute for Q1, D1 and D2 for better stability and
tracking. In the array diode transistors Q5 and Q4 (in parallel) make up D2;
similarly, Q1 and Q2 become D1 and Q3 replaces the 2N2222.
Variable Output
TL/H/7767–9
*
Optional. Improves transient response and ripple rejection.
V
OUT
e
V
SET
R1
a
R2
R2
SELECT R2 AS FOLLOWS:
LM120-5
LM120-12
LM120-15
b
300
X
b
750
X
b
1k
Current Source
*
I
OUT
e
1 mA
a
5.0V
R1
TL/H/7767–8
g
15V, 1 Amp Tracking Regulators
TL/H/7767–12
Performance (Typical)
Load Regulation at
D
I
L
e
1A
Output Ripple, C
IN
e
3000
m
F, I
L
e
1A
Temperature Stability
Output Noise 10 Hz
s
f
s
10 kHz
*
Resistor tolerance of R4 and R5 determine matching of (
a
) and
(
b
) outputs.
**
Necessary only if raw supply filter capacitors are more than 2
×
from regulators.
10 mV
100
m
Vrms
a
50 mV
150
m
Vrms
1 mV
100
m
Vrms
a
50 mV
150
m
Vrms
Light Controllers Using Silicon Photo Cells
TL/H/7767–10
*
Lamp brightness increases until i
I
e
5V/R1 (i
I
can be set as low as 1
m
A).
2
Necessary only of raw supply filter capacitor is more than 2
×
from
LM320MP.
TL/H/7767–11
*
Lamp brightness increases until i
I
e
i
Q
(1 mA)
a
5V/R1.
2
Necessary only if raw supply filter capacitor is more than 2
×
from LM320.
7