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參數(shù)資料
| 型號： | OPA569 |
| 英文描述： | Power Op Amp. Output Signal Swings Within 200mV of Rails at 2A Output Current |
| 中文描述： | 功率運(yùn)算放大器。輸出信號擺幅在200mV的Rails的輸出電流為2A |
| 文件頁數(shù)： | 15/23頁 |
| 文件大小： | 411K |
| 代理商： | OPA569 |
OPA569
SBOS264
15
www.ti.com
RAIL TO RAIL INPUT RANGE
The input common-mode voltage range of the OPA569
extends 100mV beyond the supply rails. This is achieved by
a complementary input stage with an N-channel input differ-
ential pair in parallel with a P-channel differential pair. The
N-channel input pair is active for input voltages close to the
positive rail while the P-channel input pair is active for input
voltages close to the negative rail. The transition point is
typically at (V+)
–
1.3V, and there is a small transition region
around the switching point where both transistors are on. It
is important to note that the two input pairs can have offsets
of different signs and magnitudes. Therefore, as the transi-
tion point is crossed, the offset of the amplifier changes. This
offset shift accounts for the reduced common-mode rejection
ratio over the full input common-mode range.
OUTPUT PROTECTION
Reactive and EMF-generating loads can return load current
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 6. Schottky rectifier
diodes with a 3A or greater continuous rating are recom-
mended.
THERMAL FLAG
The OPA569 has thermal sensing circuitry that provides a
warning signal when the die temperature exceeds safe limits.
Unless the Thermal Flag is connected to the Enable pin,
when this flag is triggered, the part continues to operate even
FIGURE 6. Output Protection Diode.
OPA569
Output Protection Diode
Output Protection Diode
Current
Limit
Set
R
SET
V
O
+V
12,
13
3
17,
18
–
In
+In
14,
15
–
V
Enable Pin
14,
15
8
5
6
Thermal
Flag Pin
Disable
On
7
AND
OPA569
FIGURE 7. Enable/Shutdown Control Using Thermal Flag Pin
and External Control Signal.
though the junction temperature exceeds 150
°
C. This allows
maximum usable operation in very harsh conditions but
degrades reliability. The Thermal Flag pin can be used to
provide for orderly system shutdown before failure occurs. It
can be also used to evaluate the thermal environment to
determine need for and appropriate design of a shutdown
mechanism.
The output signal is a CMOS logic gate that switches from V+
to V
–
to indicate that the amplifier is in thermal limit. This flag
output pin can source and sink up to 25
μ
A. The Thermal Flag
pin is HIGH during normal operation. Power dissipated in the
amplifier will cause the junction temperature to rise. When
the junction temperature exceeds 150
°
C, the Thermal Flag
pin will go LOW, and remain LOW until the amplifier has
cooled to 130
°
C. Despite this hysteresis, with a method of
orderly shutdown, the Thermal Flag pin can cycle on and off,
depending on load and signal conditions. This limits the
dissipation of the amplifier but may have an undesirable
effect on the load.
It is possible to connect the Thermal Flag pin directly to the
Enable pin for automatic shutdown protection. When both
thermal shutdown and the amplifier enable/disable functions
are desired, the externally generated control signal and the
Thermal Flag pin outputs should be combined with an AND
gate, as shown on Figure 7. The temperature protection was
designed to protect against overload conditions. It was not
intended to replace proper heatsinking. Continuously running
the OPA569 in and out of thermal shutdown will degrade
reliability.
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