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TLC27L1MP Folha de dados(PDF) 26 Page - Texas Instruments |
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TLC27L1MP Folha de dados(HTML) 26 Page - Texas Instruments |
26 / 32 page TLC27L1, TLC27L1A, TLC27L1B LinCMOS LOW POWER OPERATIONAL AMPLIFIERS SLOS154B− DECEMBER 1995 − REVISED JUNE 2005 26 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 APPLICATION INFORMATION output characteristics The output stage of the TLC27L1 is designed to sink and source relatively high amounts of current (see Typical Characteristics). If the output is subjected to a short-circuit condition, this high current capability can cause device damage under certain conditions. Output current capability increases with supply voltage (see Figure 43). All operating characteristics of the TLC27L1 were measured using a 20-pF load. The devices drive higher capacitive loads; however, as output load capacitance increases, the resulting response pole occurs at lower frequencies, thereby causing ringing, peaking, or even oscillation (see Figure 44). In many cases, adding some compensation in the form of a series resistor in the feedback loop alleviates the problem. (a) CL = 20 pF, RL = NO LOAD (b) CL = 260 pF, RL = NO LOAD (c) CL = 310 pF, RL = NO LOAD Figure 44. Effect of Capacitive Loads in Low-Bias Mode Although the TLC27L1 possesses excellent high-level output voltage and current capability, methods are available for boosting this capability, if needed. The simplest method involves the use of a pullup resistor (RP) connected from the output to the positive supply rail (see Figure 45). There are two disadvantages to the use of this circuit. First, the NMOS pulldown transistor, N4 (see equivalent schematic) must sink a comparatively large amount of current. In this circuit, N4 behaves like a linear resistor with an on-resistance between approximately 60 Ω and 180 Ω, depending on how hard the operational amplifier input is driven. With very low values of RP, a voltage offset from 0 V at the output occurs. Secondly, pullup resistor RP acts as a drain load to N4 and the gain of the operational amplifier is reduced at output voltage levels where N5 is not supplying the output current. 2.5 V VO CL − 2.5 V VI TA = 25°C f = 1 kHz VI(PP) = 1 V Figure 43. Test Circuit for Output Characteristics |
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