Datasheet TS432ACX (Taiwan Semiconductor) - 4
| Hersteller | Taiwan Semiconductor |
| Beschreibung | 1.24 Shunt Voltage Regulator in SOT-23 Package |
| Seiten / Seite | 9 / 4 — TS432. APPLICATION INFORMATION. APPLICATION EXAMPLE. Figure 4: Voltage … |
| Dateiformat / Größe | PDF / 580 Kb |
| Dokumentensprache | Englisch |
TS432. APPLICATION INFORMATION. APPLICATION EXAMPLE. Figure 4: Voltage Monitor
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TS432
Taiwan Semiconductor
APPLICATION INFORMATION
When The TS432A/432B 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 TS432A/432B exhibits instability with capacitances in the range of 10nF to 1µF (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 0.1µF 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 (10µF) 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 TS432A/432B is located right at the load, so the load decoupling capacitor is directly across it, then this capacitor will have to be ≤1nF or ≥10µF.
APPLICATION EXAMPLE Figure 4: Voltage Monitor Figure 5: Output Control for Three Terminal Fixed Regulator Figure 6: Shunt Regulator Figure 7: High Current Shunt Regulator
4 Version: G2408
Taiwan Semiconductor
APPLICATION INFORMATION
When The TS432A/432B 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 TS432A/432B exhibits instability with capacitances in the range of 10nF to 1µF (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 0.1µF 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 (10µF) 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 TS432A/432B is located right at the load, so the load decoupling capacitor is directly across it, then this capacitor will have to be ≤1nF or ≥10µF.
APPLICATION EXAMPLE Figure 4: Voltage Monitor Figure 5: Output Control for Three Terminal Fixed Regulator Figure 6: Shunt Regulator Figure 7: High Current Shunt Regulator
4 Version: G2408