Datasheet

OPA548
14
SBOS070B
www.ti.com
G = 1 + = 10
9kΩ
1kΩ
9kΩ1kΩ
OPA548
+30V
+5V
+5V
0.12V to 2.5V
0V to 4.75V
Output
Adjust
V+
5
6
Thermal
Shutdown Status
NOTES: (1) For V
O
≤ 0V, V– ≤ –1V.
(2) Optional: Improves noise
immunity.
(LED)
74HCT04
R ≥ 250Ω
E/S
V
O
= 1.2V to 25V
(1)
I
O
= 0 to 5A
7
4
3
1
2
V–
I
LIM
10.5kΩ
499Ω
10kΩ
Current
Limit
Adjust
1kΩ
20kΩ
0.01µF
(2)
V–
13750Ω
R
CL
I
LIM
0.01µF
(Optional, for noisy
environments)
4.75V
I
O
=
15000 (4.75V)
13750Ω + R
CL
V
O
= V
CL
(1 + R
2
/R
1
)
V–
V+
V
CL
V
CL
= = 2V
Desired V
O
= 20V,
R
1
= 1kΩ and R
2
= 9kΩ
G = = 10
20
2
For Example:
10kΩ • 4.75V
(10kΩ + 13750Ω)
If I
LIM
= 3A, R
CL
= 10kΩ
R
2
R
1
Uses voltage developed at I
LIM
pin
as a moderately accurate reference
voltage.
FIGURE 16. Resistor-Controlled Programmable Power Supply.
FIGURE 15. Voltage Source.