전자부품 데이터시트 검색엔진 |
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KM4121 데이터시트(PDF) 6 Page - Fairchild Semiconductor |
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KM4121 데이터시트(HTML) 6 Page - Fairchild Semiconductor |
6 / 10 page 6 REV. 1B June 2001 General Description The KM4111 is a single supply, general purpose, voltage- feedback amplifier fabricated on a complementary bipolar process. The KM4111 offers 35MHz unity gain bandwidth, 27V/ µs slew rate, and only 208µA supply current. It features a rail-to-rail output stage and is unity gain stable. The design utilizes a patent pending topology that provides increased slew rate performance. The common mode input range extends to 300mV below ground and to 1.2V below Vs. Exceeding these values will not cause phase reversal. However, if the input voltage exceeds the rails by more than 0.5V, the input ESD devices will begin to conduct. The output will stay at the rail during this overdrive condition. The design uses a Darlington output stage. The out- put stage is short circuit protected and offers “soft” saturation protection that improves recovery time. The typical circuit schematic is shown in Figure 1. Figure 1: Typical Configuration Enable/Disable Function (KM4121) The KM4121 offers an active-low disable pin that can be used to lower its supply current. Leave the pin floating to enable the part. Pull the disable pin to the negative supply (which is ground in a single supply application) to disable the output. During the disable condition, the nominal supply current will drop to below 40 µA and the output will be at high impedance with about 2pF capacitance. Power Dissipation The maximum internal power dissipation allowed is directly related to the maximum junction tempera- ture. If the maximum junction temperature exceeds 150°C, some reliability degradation will occur. If the maximum junction temperature exceeds 175°C for an extended time, device failure may occur. The KM4111 is short circuit protected. However, this may not guarantee that the maximum junction temperature (+150°C) is not exceeded under all conditions. Follow the maximum power derating curves shown in Figure 2 to ensure proper operation. Figure 2: Power Derating Curves Overdrive Recovery For an amplifier, an overdrive condition 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 ranges are exceeded. The KM4111 will typically recover in less than 20ns from an overdrive condition. Figure 3 shows the KM4111 in an overdriven condition. Figure 3: Overdrive Recovery Driving Capacitive Loads A small series resistance (Rs) at the output of the amplifier, illustrated in Figure 4, will improve stability and settling performance. + - KM4111 Rf 0.01 µF 6.8 µF Out In +Vs + Rg Maximum Power Dissipation Ambient Temperature ( C) -50 -30 -10 10 30 50 70 90 0 0.5 1.0 1.5 2.0 SOT23-6 lead SOT23-5 lead Time (1 µs/div) Input Output DATA SHEET KM4111/KM4121 |
유사한 부품 번호 - KM4121 |
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유사한 설명 - KM4121 |
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