OPA547F500 BURR-BROWN [Burr-Brown Corporation], OPA547F500 Datasheet - Page 11

• Manufacturer Part Number: OPA547F500
• Description: High-Voltage, High-Current OPERATIONAL AMPLIFIER
• Manufacturer: BURR-BROWN [Burr-Brown Corporation]

Output Disable and Thermal Shutdown Status
As mentioned earlier, the OPA547’s output can be disabled
and the disable status can be monitored simultaneously.
Figures 9 and 10 provide examples using a single supply and
dual supplies, respectively.
OUTPUT STAGE COMPENSATION
The complex load impedances common in power op amp
applications can cause output stage instability. For normal
operation output compensation circuitry is not typically
required. However, if the OPA547 is intended to be driven
into current limit, a R/C network may be required. Figure 11
shows an output series R/C compensation (snubber) network
(3
lent stability. Some variations in circuit values may be
required with certain loads.
FIGURE 9. Output Disable and Thermal Shutdown Status
FIGURE 10. Output Disable and Thermal Shutdown Status with Dual Supplies.
OPA547
SBOS056A
in series with 0.01 F) which generally provides excel-
NOTE: (1) Optional—may be required to limit leakage
current of optocoupler at high temperatures.
HCT or TTL In
with a Single Supply.
V–
OPA547
V+
(Output Disable)
Open Drain
2
E/S
5V
1
Optocoupler
4N38
(Thermal Status
Shutdown)
HCT
6
5
4
OPA547
V+
V–
(1)
E/S
ZVN3310
www.ti.com
Zetex
OUTPUT PROTECTION
Reactive and EMF-generating loads can return load cur-
rent to the amplifier, causing the output voltage to exceed
the power supply voltage. This damaging condition can
be avoided with clamp diodes from the output terminal to
the power supplies as shown in Figure 11. Schottkey
rectifier diodes with a 1A or greater continuous rating are
recommended.
FIGURE 11. Motor Drive Circuit.
V
IN
7.5k
1W
5k
R
1
1
2
D
1
, D
2
OPA547
: International Rectifier 11DQ06.
Optocoupler
V+
V–
4N38
20k
R
2
D
2
6
5
4
D
G = –
1
5V
(Carbon)
R
R
0.01µF
2
1
3
= –4
TTL Out
Motor
11