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SC431L Datasheet(PDF) 8 Page - Semtech Corporation |
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SC431L Datasheet(HTML) 8 Page - Semtech Corporation |
8 / 10 page 8 2008 Semtech Corp. www.semtech.com POWER MANAGEMENT SC431L Applications Information - Stability Selection of load capacitance when using SC431L as a shunt regulator When the SC431L is used as a shunt regulator, two options for selection of C L (see diagram on page 7) are recommended for optimal stability: 1) No load capacitance across the device, decouple at the load. 2) Large capacitance across the device, optional decoupling at the load. The reason for this is that SC431L exhibits instability with capacitances in the range of 10nF to 1µF (approx.) at light cathode currents (up to 3mA typical). 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 (say) 10mA with a 0.1µF capacitor across it, it will oscillate transiently during start- up as the cathode current passes through the instability region. Selecting a very low (or preferably, no) capacitance, or alternatively a high capacitance (such as 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 SC431L 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. |
Similar Part No. - SC431L_08 |
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Similar Description - SC431L_08 |
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