OPA454 Datasheet, PDF (18/36 Pages) Texas Instruments – High-Voltage (100V), High-Current (50mA) OPERATIONAL AMPLIFIERS, G = 1 Stable

OPA454
SBOS391 – DECEMBER 2007
INPUT RANGE
The OPA454 is specified to give linear operation with
input swing to within 2.5V of either supply. Generally,
a gain of +1 is the most demanding configuration.
Figure 61 and Figure 62 show output behavior as the
input swings to within 0V of the rail, using the circuit
shown in Figure 64. Figure 63 shows the behavior
with an input signal that swings beyond the specified
input range to within 1V of the rail, also using the
circuit in Figure 64. Notice that the beginning of the
phase reversal effect may be reduced by inserting
series resistance (R_S) in the connection to the
positive input. Note that V_OUT does not swing all the
way to the opposite rail.
50.5
50.0
49.5
49.0
V+
V_IN
f = 1kHz
48.5
48.0
47.5
47.0
0
20
V_OUT
R_S = 50kW
T_A = +25°C
V_OUT
R_S = 0W
40
60
Time (ms)
80
100
Figure 61. Output Voltage With Input Voltage Up
To V+
-46.0
-46.5
-47.0
-47.5
V_OUT
R_S = 0W
-48.0
-48.5
-49.0
-49.5
V_IN
f = 1kHz
-50.0
-50.5 ^V-
0
20
V_OUT
R_S = 50kW
40
60
Time (ms)
T_A = +25°C
80
100
Figure 62. Output Voltage With Input Voltage
Down To V–
www.ti.com
-46.0
-46.5
-47.0
-47.5
-48.0
-48.5
-49.0
-49.5
-50.0
-50.5 ^V-
0
V_OUT
R_S = 50kW
V_IN
f = 1kHz
20
40
60
Time (ms)
T_A = +25°C
V_OUT
R_S = 0W
80
100
Figure 63. Output Voltage With Input Voltage
Down To (V–) + 1V
R_S
V_IN
R_F
10kW
V+ = +50V
OPA454
V- = -50V
V_OUT
R_L
4.8kW
Figure 64. Input Range Test Circuit
OUTPUT RANGE
The OPA454 is specified to swing to within 1V of
either supply rail with a 49kΩ load while maintaining
excellent linearity. Swing to the rail decreases with
increasing output current. The OPA454 can swing to
within 2V of the negative rail and 3V of the positive
rail with a 1.88kΩ load. The typical characteristic
curve, Output Voltage Swing vs Output Current
(Figure 11), shows this behavior in detail.
18
Submit Documentation Feedback
Product Folder Link(s): OPA454
Copyright © 2007, Texas Instruments Incorporated