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TS431BCTA3 データシート(PDF) 3 Page - Taiwan Semiconductor Company, Ltd |
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TS431BCTA3 データシート(HTML) 3 Page - Taiwan Semiconductor Company, Ltd |
3 / 13 page TS431 Adjustable Precision Shunt Regulator 3/13 Version: F07 Test Circuits Figure 1: VKA = VREF Figure 2: VKA > VREF Figure 3: Off-State Current Additional Information – Stability When The TS431/431A/431B is used as a shunt regulator, there are two options for selection of CL, are recommended for optional stability: A) No load capacitance across the device, decouple at the load. B) Large capacitance across the device, optional decoupling at the load. The reason for this is that TS431/431A/431B exhibits instability with capacitances in the range of 10nF to 1uF (approx.) at light cathode current up to 3mA (typ). The device is less stable the lower the cathode voltage has been set for. Therefore while the device will be perfectly stable operating at a cathode current of 10mA (approx.) with a 0.1uF capacitor across it, it will oscillate transiently during start up as the cathode current passes through the instability region. Select a very low capacitance, or alternatively a high capacitance (10uF) will avoid this issue altogether. Since the user will probably wish to have local decoupling at the load anyway, the most cost effective method is to use no capacitance at all directly across the device. PCB trace/via resistance and inductance prevent the local load decoupling from causing the oscillation during the transient start up phase. Note: if the TS431/431A/431B is located right at the load, so the load decoupling capacitor is directly across it, then this capacitor will have to be ≤1nF or ≥10uF. Applications Examples Figure 4: Voltage Monitor Figure 5: Output Control for Three Terminal Fixed Regulator |
同様の部品番号 - TS431BCTA3 |
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同様の説明 - TS431BCTA3 |
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