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BUF634F 数据手册 - Burr Brown
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BUF634F数据手册
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Frequency (Hz)
Gain (db)
0
20
40
100 1k 10k 100k 1M
BUF634
SBOS030A –SEPTEMBER 2000–REVISED NOVEMBER 2015
www.ti.com
Typical Application (continued)
8.2.1.1 Design Requirements
• Boost the output current of an OPA627
• Operate from ±15V power supplies
• Operate from -40°C to +85°C
• Gain = 23.5 V/V
• Output current = ±250 mA
• Bandwidth greater than 100 kHz
8.2.1.2 Detailed Design Procedure
To assure that the composite amplifier remains stable, the phase shift of the BUF634 device must remain small
throughout the loop gain of the circuit. For a G=+1 op amp circuit, the BUF634 device must contribute little
additional phase shift (approximately 20° or less) at the unity-gain frequency of the op amp. Phase shift is
affected by various operating conditions that may affect stability of the op amp; see Typical Characteristics.
Most general-purpose or precision op amps remain unity-gain stable with the BUF634 device connected inside
the feedback loop as shown. Large capacitive loads may require the BUF634 device to be connected for wide
bandwidth for stable operation. High speed or fast-settling op amps generally require the wide bandwidth mode
to remain stable and to assure good dynamic performance. To check for stability with an op amp, look for
oscillations or excessive ringing on signal pulses with the intended load, and worst-case conditions that affect
phase response of the buffer. Connect the circuit as shown in Figure 24. Choose resistors to provide a voltage
gain of 23.5 V/V. Select the feedback resistor to be 2.7 kΩ. Choose the input resistor to be 120 Ω.
8.2.1.3 Application Curve
Figure 25. Frequency Response of Composite Amplifier
14 Submit Documentation Feedback Copyright © 2000–2015, Texas Instruments Incorporated
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