V+ = +30V
V– = 0V
1kΩ
9kΩ
9kΩ
1kΩ
G = 1 +
= 10
+5V
10.5kΩ
3
4
VO = 1V to 25V
IO = 0 to 10A
OPA549
0.12V to 2.5V
Output
Adjust
E/S
9
10kΩ
6
Ref
ILIM
74HCT04
8
R ≥ 250Ω
499Ω
+5V
V–
Thermal
Shutdown Status
(LED)
0V to 4.75V
1kΩ
Current
Limit
Adjust
20kΩ
0.01µF
FIGURE 10. Resistor-Controlled Programmable Power Supply.
V+ = +30V
V– = 0V
1kΩ
9kΩ
–5V
OUTPUT ADJUST
VREF
G = 10
+5V
VREF A
3
4
+5V
RFB A
1, 2
V
O = 7V to 25V
OPA549
10pF
IOUT A
9
IO = 0A to 10A
1/2
OPA2336
E/S
1/2 DAC7800/1/2(3)
74HCT04
6
R ≥ 250Ω
DAC A
Ref
8
AGND A
ILIM
Thermal
(LED)
Shutdown Status
VREF B
RFB B
10pF
IOUT B
1/2
OPA2336
1/2 DAC7800/1/2
DAC B
0.01µF
DGND
AGND B
CURRENT LIMIT ADJUST
Choose DAC780X based on digital interface: DAC7800
- 12-bit
interface, DAC7801 - 8-bit interface + 4 bits, DAC7802 - serial interface.
FIGURE 11. Digitally-Controlled Programmable Power Supply.
®
13
OPA549
BB [ BURR-BROWN CORPORATION ]
