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FAN4174 数据表(PDF) 9 Page - Fairchild Semiconductor |
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FAN4174 数据表(HTML) 9 Page - Fairchild Semiconductor |
9 / 15 page © 2004 Fairchild Semiconductor Corporation www.fairchildsemi.com FAN4174/FAN4274 • Rev. 1.0.4 9 Application Information General Description The FAN4174 amplifier includes single-supply, general- purpose, voltage-feedback amplifiers, fabricated on a bi-CMOS process. The family features a rail-to-rail input and output and is unity gain stable. The typical non- inverting circuit schematic is shown in Figure 22. Figure 22. Typical Non-inverting Configuration Input Common Mode Voltage The common mode input range extends to 300mV below ground and to 100mV above VS in single supply operation. Exceeding these values does not cause phase reversal; however, if the input voltage exceeds the rails by more than 0.5V, the input ESD devices begin to conduct. The output stays at the rail during this overdrive condition. If the absolute maximum input VIN (700mV beyond either rail) is exceeded, externally limit the input current to ±5mA, as shown in Figure 23. Figure 23. Circuit for Input Current Protection Power Dissipation The maximum internal power dissipation allowed is directly related to the maximum junction temperature. If the maximum junction temperature exceeds 150°C, performance degradation occurs. If the maximum junction temperature exceeds 150°C for an extended time, device failure may occur. Overdrive Recovery Overdrive of an amplifier occurs when the output and/or input ranges are exceeded. The recovery time varies based on whether the input or output is overdriven and by how much the range is exceeded. The FAN4174 typically recovers in less than 500ns from an overdrive condition. Figure 24 shows the FAN4174 amplifier in an overdriven condition. Figure 24. Overdrive Recovery Driving Capacitive Loads Figure 10 illustrates the response of the FAN4174 amplifier family. A small series resistance (RS) at the output of the amplifier, illustrated in Figure 25, improves stability and settling performance. RS values in Figure 10 were chosen to achieve maximum bandwidth with less than 2dB of peaking. For maximum flatness, use a larger RS. Capacitive loads larger than 500pF require the use of RS. Figure 25. Typical Topology for Driving a Capacitive Load Driving a capacitive load introduces phase-lag into the output signal, which reduces phase margin in the amplifier. The unity gain follower is the most sensitive configuration. In a unity gain follower configuration, the FAN4174 amplifier family requires a 300 Ω series resistor to drive a 100pF load. |
类似零件编号 - FAN4174_08 |
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类似说明 - FAN4174_08 |
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