Datasheet

OPA547
13
SBOS056F
www.ti.com
DAC B
1/2 DAC7800/1/2
(3)
1/2 DAC7800/1/2
(3)
10pF
I
OUT B
R
FB B
AGND B
0.01µF
(2)
I
LIM
Thermal
Shutdown Status
(LED)
74HCT04
R ≥ 250Ω
9kΩ1kΩ
V
O
= 0.8 to 25V
(1)
I
O
= 0 to 750mA
G = 10
V–
E/S
DAC A
+5V
+5V
V
REF B
DGND
10pF
I
OUT A
R
FB A
OUTPUT ADJUST
OPA547
CURRENT LIMIT ADJUST
AGND A
+30V
V
REF A
NOTES: (1) For V
O
= 0V, V– = –1V. (2) Optional, improves noise immunity. (3) Chose DAC780X based on
digital interface: DAC7800—12-bit interface, DAC7801—8-bit interface + 4 bits, DAC7802—serial interface.
(4) Can use OPA2237, I
O
= 100mA to 750mA.
1/2
OPA2336
1/2
OPA2336
V
REF
+10V
FIGURE 14. Digitally-Controlled Programmable Power Supply.
FIGURE 16. Multiple Current Limit Values.
OPA547
R
C2
R
C1
Close for high current
(Could be open drain
output of a logic gate).
I
LIM
V–
( )
E/S
R
2
R
1
V
IN1
AMP1
V
O
E/S
R
4
R
3
V
E/S
> (V–) +2.4V: Amp 1 is on, Amp 2 if off
V
O
= –V
IN1
R
2
R
1
V
E/S
V
IN2
AMP2
( )
V
E/S
< (V–) +2.4V: Amp 2 is on, Amp 1 if off
V
O
= –V
IN2
R
4
R
3
FIGURE 15. Swap Amplifier.