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EL5210CS Datasheet(PDF) 11 Page - Intersil Corporation |
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EL5210CS Datasheet(HTML) 11 Page - Intersil Corporation |
11 / 16 page 11 FN7185.3 July 5, 2007 Applications Information Product Description The EL5210 and EL5410 voltage feedback amplifiers are fabricated using a high voltage CMOS process. They exhibit Rail-to-Rail input and output capability, are unity gain stable and have low power consumption (2.5mA per amplifier). These features make the EL5210 and EL5410 ideal for a wide range of general-purpose applications. Connected in voltage follower mode and driving a load of 1k Ω and 12pF, the EL5210 and EL5410 have a -3dB bandwidth of 30MHz while maintaining a 33V/µS slew rate. The EL5210 is a dual amplifier while the EL5410 is a quad amplifier. Operating Voltage, Input, and Output The EL5210 and EL5410 are specified with a single nominal supply voltage from 5V to 15V or a split supply with its total range from 5V to 15V. Correct operation is guaranteed for a supply range of 4.5V to 16.5V. Most EL5210 and EL5410 specifications are stable over both the full supply range and operating temperatures of -40°C to +85°C. Parameter variations with operating voltage and/or temperature are shown in the typical performance curves. The input common-mode voltage range of the EL5210 and EL5410 extends 500mV beyond the supply rails. The output swings of the EL5210 and EL5410 typically extend to within 100mV 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 1 shows the input and output waveforms for the device in the unity-gain configuration. Operation is from ±5V supply with a 1k Ω load connected to GND. The input is a 10V P-P sinusoid. The output voltage is approximately 9.8VP-P. FIGURE 1. OPERATION WITH RAIL-TO-RAIL INPUT AND OUTPUT Short Circuit Current Limit The EL5210 and EL5410 will limit the short circuit current to ±120mA if the output is directly shorted to the positive or the negative supply. If an output is shorted indefinitely, the power dissipation could easily increase such that the device may be damaged. Maximum reliability is maintained if the output continuous current never exceeds ±30mA. This limit is set by the design of the internal metal interconnects. Output Phase Reversal The EL5210 and EL5410 are immune to phase reversal as long as the input voltage is limited from VS- -0.5V to VS+ +0.5V. Figure 2 shows a photo of the output of the device with the input voltage driven beyond the supply rails. Although the device's output will not change phase, the input's overvoltage should be avoided. If an input voltage exceeds supply voltage by more than 0.6V, electrostatic protection diodes placed in the input stage of the device begin to conduct and overvoltage damage could occur. FIGURE 2. OPERATION WITH BEYOND-THE-RAILS INPUT Power Dissipation With the high-output drive capability of the EL5210 and EL5410 amplifiers, it is possible to exceed the 125°C 'absolute-maximum junction temperature' under certain load current conditions. Therefore, it is important to calculate the maximum junction temperature for the application to determine if load conditions need to be modified for the amplifier to remain in the safe operating area. The maximum power dissipation allowed in a package is determined according to: Where: TJMAX = Maximum Junction Temperature TAMAX= Maximum Ambient Temperature ΘJA = Thermal Resistance of the Package PDMAX = Maximum Power Dissipation in the Package. The maximum power dissipation actually produced by an IC is the total quiescent supply current times the total power supply voltage, plus the power in the IC due to the loads, or: VS=±5V TA=25°C AV=1 VIN=10VP-P 5V 5V 10µs VS=±2.5V TA=25°C AV=1 VIN=6VP-P 1V 1V 10µs P DMAX T JMAX T AMAX – Θ JA --------------------------------------------- = P DMAX ΣiV [ S I SMAX V ( S+VOUTi ) I LOADi × – + ×] = EL5210, EL5410 |
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