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GM7130HV-3.3TA5TG Datasheet(PDF) 8 Page - Gamma Microelectronics Inc. |
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GM7130HV-3.3TA5TG Datasheet(HTML) 8 Page - Gamma Microelectronics Inc. |
8 / 10 page 8 GM7130HV 3A STEP DOWN VOLTAGE SWITCHING REGULATORS Application Hints Input Capacitors (CIN) The regulator input pin must be by-passed with at least a 100 μF electrolytic capacitor to maintain stability. The capacitor ’s leads must be kept short, and located near GM1730HV. If the operating temperature range includes temperature below -25°C, the input capacitor value may need to be larger. With most electrolytic capacitors, the capacitance value decreases and the ESR increase with lower temperature and age. It is suggested to parallel a ceramic or solid tantalum capacitor to increase the stability at cold temperature. It is n should be used for best results. When using the Adjustable version, place the programming resistors as close as possible to GM7130HV, to keep the sensitive feedback wiring short. Inductor Selection All switching regulators have two basic modes of operation: continuous and discontinuous. The difference between the two types relates to the inductor current, whether it is flowing continuously, or if it drops to zero for a period of time in the normal switching cycle. Each mode has distinctively different operating characteristics, which can affect the regulator performance and requirements. The GM7130HV can be used for both continuous and discontinuous modes of operation. Inductors are available in different styles such as pot core, toriod, E-frame, bobbin core, etc., as well as different core materials, such as ferrites and powdered iron. The least expensive, the bobbin core type, consists of wire wrapped on a ferrite rod core. This type of construction makes for an inexpensive inductor, but since the magnetic flux is not completely contained within the core, it generates more electromagnetic interference (EMI). This EMI can cause problems in sensitive circuits, or can give incorrect scope readings because of induced voltages in the scope probe. An inductor should not be operated beyond its maximum rated current because it may saturate. When an inductor begins to saturate, the inductance decreases rapidly and the inductor begins to look mainly a resistor (the DC resistance of the winding). This will cause the switch current to rise very rapidly. Different inductor types have different saturation characteristics, and this should be kept in mind when selecting an inductor. The inductor manufacturer’s data sheets include current and energy limits to avoid inductor saturation. |
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