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ISL24021 bảng dữ liệu(PDF) 9 Page - Intersil Corporation |
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ISL24021 bảng dữ liệu(HTML) 9 Page - Intersil Corporation |
9 / 12 page 9 FN6637.0 June 3, 2009 Applications Information Product Description The ISL24021 is a high output current, high voltage, rail-to-rail voltage feedback amplifier. The ISL24021 is capable of ±1A peak output short circuit current. The amplifier exhibits beyond the rail input capability, rail-to-rail output capability and is unity gain stable. Other features include fast slew rate and settling time which is important in many applications, such as TFT-LCD panels. The ISL24021 is available in a 8 Ld 3mmx3mm TDFN package featuring a standard operational amplifier pinout and a lead pitch of 0.65mm. The device utilizes a thermally enhanced package and has a built-in thermal protection circuit. It is specified for operation over an ambient temperature range of -40°C to +85°C. Operating Voltage, Input and Output Capability The ISL24021 can operate on a single supply or dual supply configuration. The ISL24021 operating voltage ranges from a minimum of 4.5V to a maximum of 19V. This range allows for a standard 5V (or ±2.5V) supply voltage to dip to -10%, or a standard 18V (or ±9V) to rise by +5.5% without affecting performance or reliability. The input common mode voltage range extends 0.5V beyond the supply rails. For this range, the ISL24021 amplifier is immune to phase reversal. If the common mode input voltage exceeds the supply voltage by more than 0.5V, electrostatic protection diodes in the input stage of the device begin to conduct. It is suggested to not overdrive the inputs. Figure 23 shows the input voltage driven beyond the supply rails and the device output swinging between the supply rails. The output swings of the ISL24021 typically extend to within 25mV of positive and negative supply rails with load currents of ±5mA. Decreasing load currents will extend the output voltage range even closer to the supply rails. Figure 24 shows the input and output waveforms for the device in a unity-gain configuration. Operation is from ±5V supply with a 1k Ω load connected to GND. The input is a 10V P-P sinusoid and the output voltage is approximately 9.95VP-P. Refer to the “Electrical Specifications” tables beginning on page 2 for specific device parameters. Parameter variations with operating voltage, loading and/or temperature are shown in the “Typical Performance Curves” on page 5. . Output Current Limit The ISL24021 is capable of ±1A peak output short circuit current. The device will limit the current to ±1A. Maximum reliability is maintained if the output continuous current never exceeds ±300mA. This limit is set by the characteristics of the internal metal interconnects. See “Power Dissipation” on page 10 for detailed information about ensuring device operation with temperature and load conditions. Driving Capacitive Loads As load capacitance increases, the -3dB bandwidth will decrease and peaking can occur. Depending on the application, it may be necessary to reduce peaking and to improve device stability. To improve device stability a snubber circuit or a series resistor may be added to the output of the ISL24021. A snubber is a shunt load consisting of a resistor in series with a capacitor, see Figure 25. An optimized snubber can improve the phase margin and the stability of the ISL24021. The advantage of a snubber circuit is that it does not draw any DC load current or reduce the gain. Another method to reduce peaking is to add a series output resistor (typically between 1 Ω to 10Ω; see Figure 26). Depending on the capacitive loading, a small value resistor may be the most appropriate choice to minimize any reduction in gain. 1V 1V 10µs VS = ±2.5V, TA = +25°C, AV = 1, VIN = 6VP-P FIGURE 23. OPERATION WITH BEYOND-THE-RAILS INPUT 5V 5V 10µs VS = ±5V, TA = +25°C, AV = 1, VIN = 10VP-P FIGURE 24. OPERATION WITH RAIL-TO-RAIL INPUT AND OUTPUT ISL24021 |
Số phần tương tự - ISL24021 |
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Mô tả tương tự - ISL24021 |
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