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OPA4350UA Datasheet(PDF) 10 Page - Texas Instruments |
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OPA4350UA Datasheet(HTML) 10 Page - Texas Instruments |
10 / 29 page OPA350 OPA2350 OPA4350 SBOS099C − SEPTEMBER 2000 − REVISED JANUARY 2005 www.ti.com 10 V BIAS1 V BIAS2 V IN+ V IN− Class AB Control Circuitry V O V − (Ground) V+ Reference Current Figure 2. Simplified Schematic 5k Ω OPAx350 10mA max V+ V IN V OUT I OVERLOAD Figure 3. Input Current Protection for Voltages Exceeding the Supply Voltage RAIL-TO-RAIL OUTPUT A class AB output stage with common-source transistors is used to achieve rail-to-rail output. For light resistive loads (>10k Ω), the output voltage swing is typically ten millivolts from the supply rails. With heavier resistive loads (600 Ω to 10kΩ), the output can swing to within a few tens of millivolts from the supply rails and maintain high open-loop gain. See the typical characteristics Output Voltage Swing vs Output Current and Open-Loop Gain vs Output Voltage. CAPACITIVE LOAD AND STABILITY OPA350 series op amps can drive a wide range of capacitive loads. However, all op amps under certain conditions may become unstable. Op amp configuration, gain, and load value are just a few of the factors to consider when determining stability. An op amp in unity-gain configuration is the most susceptible to the effects of capacitive load. The capacitive load reacts with the op amp’s output impedance, along with any additional load resistance, to create a pole in the small-signal response that degrades the phase margin. In unity gain, OPA350 series op amps perform well with very large capacitive loads. Increasing gain enhances the amplifier’s ability to drive more capacitance. The typical characteristic Small-Signal Overshoot vs Capacitive Load shows performance with a 1k Ω resistive load. Increasing load resistance improves capacitive load drive capability. |
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