OPA454_16 Datasheet, PDF (26/47 Pages) Texas Instruments – High-Voltage (100-V), High-Current (50-mA) Operational Amplifiers

OPA454
SBOS391B – DECEMBER 2007 – REVISED MARCH 2016
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Typical Application (continued)
Figure 69 shows the V_LOAD output, a 195-V_PP, 20-kHz sine wave, as developed across the 3.75-kΩ load resistor.
The peak current provided by the OPA454 U3 output is 26 mA. U1 and U2 alternately source and sink the output
current, in addition to the operating current required by U3.
100
75
V₀₁
50
V_LOAD
25
0
-25
V₀₂
-50
-75
-100
Time (20ms/div)
Figure 69. Output Voltage Boost Develops 195-V_PP V_LOAD Across 3.75-kΩ Load Resistance
The output voltage booster may be used in an inverting configuration also. This use is easily accomplished by
applying the input signal to the input resistor R₁ as seen in Figure 70. The noninverting input is grounded and the
ratio of feedback resistor R₂ to R₁ is set to 20:1 to satisfy the inverting gain equation given in Equation 2.
A = ^-VOUT = ^-R2
V
V_IN
R
1
where
• R₁ = 10 kΩ
• R₂ = 200 kΩ
• A_V = –20 V/V
(2)
R1
10k
VG1 ⁺ _{4.75 Vpk}
To Vo2
-V1
R2
200k
+V1
R5
R4
100k
1M
Status
_ ^{Flg E/D}
V-
Z1
1N5229B
-V1
+ ^V+
+V1
E/D Com
U3 OPA454
-V1
To Vo1
To U2
+IN
R12
100k
R14
100k
To U1
+IN
R3
3.75k
+ VLoad
-
Figure 70. OPA454 Output Boost Circuit Applied as an Inverting Amplifier
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