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OP250GS データシート(PDF) 11 Page - Analog Devices |
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OP250GS データシート(HTML) 11 Page - Analog Devices |
11 / 16 page OP250/OP450 REV. 0 –11– +5V RX 20 VOUT VIN OP250 Figure 28. Output Short-Circuit Protection Power Dissipation Although the OPx50 family of amplifiers are able to provide load currents of up to 250 mA, proper attention should be given to not exceed the maximum junction temperature for the device. The equation for finding the junction temperature is given as: T JJA =+ PT DISS A × θ (3) Where TJ = OPx50 junction temperature PDISS = OPx50 power dissipation θ JA = OPx50 junction-to-ambient thermal resistance of the package; and TA = The ambient temperature of the circuit In any application, the absolute maximum junction temperature must be limited to +150 °C. If this junction temperature is ex- ceeded, the device could suffer premature failure. If the output voltage and output current are in phase, for example, with a purely resistive load, the power dissipated by the OPx50 can be found as: P DISS =× − () IV V LOAD SY OUT (4) Where ILOAD = OPx50 output load current VSY = OPx50 supply voltage; and VOUT = The output voltage By calculating the power dissipation of the device and using the thermal resistance value for a given package type, the maximum allowable ambient temperature for an application can be found using Equation 3. Overdrive Recovery The overdrive, or overload, recovery time of an amplifier is the time required for the output voltage to return to a rated output voltage from a saturated condition. This recovery time can be important in applications where the amplifier must recover quickly after a large transient event. The circuit in Figure 29 was used to evaluate the recovery time for the OPx50. Figures 30 and 31 show the overload recovery of the OP250 from the positive and negative rails. It takes approximately 0.5 ms for the amplifier to recover from output overload. OP250 10k 9k 1k 1VP–P VIN VOUT Figure 29. Overload Recovery Time Test Circuit 1µs 500mV Figure 30. Saturation Recovery from the Positive Rail 1µs 500mV Figure 31. Saturation Recovery from the Negative Rail Capacitive Loading The OPx50 family of amplifiers is well suited to driving capaci- tive loads. The device will remain stable at unity gain even un- der heavy capacitive load conditions. However, a capacitive load does not come without a penalty in bandwidth. Figure 32 shows a graph of the OPx50 unity-gain bandwidth under various ca- pacitive loads. CAPACITIVE LOAD – nF 1.0 0.8 0 01k 1 10 100 0.6 0.4 0.2 VS = 2.5V RL = 10k TA = +25 C Figure 32. Unity-Gain Bandwidth vs. Capacitive Load As with any amplifier, an increase in capacitive load will also re- sult in an increase in overshoot and ringing. To improve the output response, a series R-C network, known as a snubber, can |
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同様の説明 - OP250GS |
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