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LM432BA3 bảng dữ liệu(PDF) 7 Page - Cystech Electonics Corp. |
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LM432BA3 bảng dữ liệu(HTML) 7 Page - Cystech Electonics Corp. |
7 / 9 page CYStech Electronics Corp. Spec. No. : C504N3 Issued Date : 2003.03.21 Revised Date : 2005.10.07 Page No. : 7/9 LM432XA3/N3 CYStek Product Specification 15k 8.25k PL432 232 Iz OUT GND 10£gF Applications Information - Stability Selection of load capacitance when using LM432 as a shunt regulator When the LM432 is used as a shunt regulator, two options for selection of CL(see diagram on page 6) are recommended for optimal stability: 1) No load capacitance across the device, decouple at the load. 2) Large capacitance across the device, optimal decoupling at the load. The reason for this is that LM432 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) capaci- tance, 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 LM432 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. Iz R1 R2 PL432 R CL LM432 LM432 |
Số phần tương tự - LM432BA3 |
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Mô tả tương tự - LM432BA3 |
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