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GM432AST25RL Datasheet(PDF) 8 Page - Gamma Microelectronics Inc. |
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GM432AST25RL Datasheet(HTML) 8 Page - Gamma Microelectronics Inc. |
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8 / 13 page  Stability Boundary Conditions A Note About Stability When using the GM432 as a shunt regulator, you can optimize stability by setting C either (1) no load ca- L pacitance across the GM432, decouple at the load; or (2) large capacitance across the GM432, optional de- coupling at the load. The GM432 can become unsta- ble with capacitances of approximately 10nF to 1µF when cathode currents are less than 3mA or so, with instability increasing as cathode current is reduced. So, while the GM432 is happily stable at, for example, cathode current of 10mA with a 0.1µF capacitor across it, it can oscillate transiently as the cathode cur- rent rises through the region of instability. To avoid this problem completely, simply eliminate the capaci- tor or select a very low or very high (e.g. 10µF) capac- itor C . Since you will probably want local decoupling L at the load, the best idea is to use no capacitance across the device. Just the resistance and capaci- tance of the PCB traces and vias will prevent local load decoupling from causing transient oscillation dur- ing start-up. If you place the GM432 right next to the load, with the load decoupling capacitor directly across it, you must use a capacitor of nF or 10µF. + _ R GM432 R1 R2 CL IK C - Load Capacitance - µF L Tantalum Capacitors * Stability boundary condition test shows that tantalum capacitors are recommended to minimize the conditions that may cause the device to oscillate. 16 14 12 10 8 6 4 2 0 0.001 0.01 0.1 1 10 C - Load Capacitance - µF L Tantalum Capacitors T =25°C A V=V KA ref Stable V =2V KA V =3V KA 1.0 0.8 0.6 0.4 0.2 0 0.001 0.01 0.1 1 10 For V = 2 & 3V KA Device does not Oscillate T =25°C A Stable V=V KA ref 8 A A MICROELECTRONICS GM432 1.24V ADJUSTABLE PRECISION SHUNT REGULATORS Power Management |
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Similar Description - GM432AST25RL |
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