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TL431ZCD Datasheet(PDF) 10 Page - IK Semicon Co., Ltd |
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TL431ZCD Datasheet(HTML) 10 Page - IK Semicon Co., Ltd |
10 / 14 page TL431Z Figure 31. Simplified TL431Z Device Model Figure 32. Example 1 Circuit Open Loop Gain Plot Figure 33. Example 2 Circuit Open Loop Gain Plot Example 2. IC = 7.5 mA, RL = 2.2 kΩ, CL = 0.01 µF. Cathode tied to reference input pin. An examination of the data sheet stability boundary curve (Figure 15) shows that this value of load capacitance and cathode current is on the boundary. Define the transfer gain. The DC gain is: G = GMRGMGoRL = (2.323)(1.0 M)(1.25 µ)(2200) = 6389 = 76 dB The resulting open loop Bode plot is shown in Figure 33. The asymptotic plot may be expressed as the following equation: Note that the transfer function now has an extra pole formed by the load capacitance and load resistance. Note that the crossover frequency in this case is about 250 kHz, having a phase margin of about –46 degrees. Therefore, instability of this circuit is likely. With three poles, this system is unstable. The only hope for stabilizing this circuit is to add a zero. However, that can only be done by adding a series resistance to the output capacitance, which will reduce its effectiveness as a noise filter. Therefore, practically, in reference voltage applications, the best solution appears to be to use a smaller value of capacitance in low noise applications or a very large value to provide noise filtering and a dominant pole rolloff of the system. Rev. 01 |
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