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KM4212 Datasheet(PDF) 6 Page - Fairchild Semiconductor |
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KM4212 Datasheet(HTML) 6 Page - Fairchild Semiconductor |
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6 / 10 page 
General Description The KM4212 is a single supply, general purpose, voltage- feedback amplifier fabricated on a complementary bipolar process. The KM4212 offers 7.3MHz unity gain bandwidth, 9V/ µs slew rate, and only 70µA 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 Power Dissipation The maximum internal power dissipation allowed is directly related to the maximum junction temperature. 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 KM4212 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 KM4212 will typically recover in less than 60ns from an overdrive condition. Figure 3 shows the KM4212 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. Figure 4: Typical Topology for driving a capacitive load + - 1/2 KM4212 Rf 0.01 µF 6.8 µF Out1 +In1 +Vs + Rg Ambient Temperature ( C) -50 -30 -10 10 30 50 70 90 0 0.5 1.0 1.5 2.0 SOIC-8 lead MSOP-8 lead Time (2 µs/div) Input G = 5 Output + - Rf Rg Rs CL RL DATA SHEET KM4212 6 REV. 1 August 2001 |
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