Power amplifiers
... Current limit ICmax, current which melts the connections between leads and semiconductor. Dissipated power limit PDmax Secondary breakdown Due to the non-uniform flow of the base-emitter junction current, which causes localized power dissipation and temperature increase at certain points “hot s ...
... Current limit ICmax, current which melts the connections between leads and semiconductor. Dissipated power limit PDmax Secondary breakdown Due to the non-uniform flow of the base-emitter junction current, which causes localized power dissipation and temperature increase at certain points “hot s ...
AN817 A Discrete Approach to Battery Charging for Cellular
... region 2 is CV. A fully discharged cell (typically 3 V) will initially be charged by a constant current, since the cell’s voltage is well below the 4.1-V constant voltage limit. Once the cell’s voltage rises to the float voltage of 4.1 V, the charging circuitry limits the further rise in terminal vo ...
... region 2 is CV. A fully discharged cell (typically 3 V) will initially be charged by a constant current, since the cell’s voltage is well below the 4.1-V constant voltage limit. Once the cell’s voltage rises to the float voltage of 4.1 V, the charging circuitry limits the further rise in terminal vo ...
Resistance - Purdue Physics
... The task at hand is to develop a model for the temperature dependence of the resistance of a material. This can be accomplished by considering the temperature dependence of each term in Eq. 9. D. Temperature Dependence of Electrical Resistance for a Metal To evaluate the various factors appearing in ...
... The task at hand is to develop a model for the temperature dependence of the resistance of a material. This can be accomplished by considering the temperature dependence of each term in Eq. 9. D. Temperature Dependence of Electrical Resistance for a Metal To evaluate the various factors appearing in ...
10EC73_UNIT2 - WordPress.com
... ADVANTAGES OF BJT’S BJT’s have high switching frequencies since their turn-on and turn-off time arelow. The turn-on losses of a BJT are small. BJT has controlled turn-on and turn-off characteristics since base drive control is possible. BJT does not require commutation circuits. ...
... ADVANTAGES OF BJT’S BJT’s have high switching frequencies since their turn-on and turn-off time arelow. The turn-on losses of a BJT are small. BJT has controlled turn-on and turn-off characteristics since base drive control is possible. BJT does not require commutation circuits. ...
An experimental apparatus measuring convective heat transfer
... 1000mm and 150mm, respectively, with the same inside diameter of 7mm. The diameter of the wire sensor is 50µm and its length is 7mm. A hot-wire sensor indicated as Rw is connected in series with the standard resistor Rstd. Ends of this resistor circuit are connected to a DC power supply, which suppl ...
... 1000mm and 150mm, respectively, with the same inside diameter of 7mm. The diameter of the wire sensor is 50µm and its length is 7mm. A hot-wire sensor indicated as Rw is connected in series with the standard resistor Rstd. Ends of this resistor circuit are connected to a DC power supply, which suppl ...
MAX894L/MAX895L Dual, Current-Limited, High-Side P-Channel Switches with Thermal Shutdown General Description
... is limited by the internal current-limiting error amplifier to 1.5 x ILIMIT. When the fault condition is removed, the replica error amplifier sets the current limit back to ILIMIT. For a high ∆VDS/∆t during an output short-circuit condition, the switch turns off and disconnects the input supply from ...
... is limited by the internal current-limiting error amplifier to 1.5 x ILIMIT. When the fault condition is removed, the replica error amplifier sets the current limit back to ILIMIT. For a high ∆VDS/∆t during an output short-circuit condition, the switch turns off and disconnects the input supply from ...
Thermal stability of the krypton Hall effect thruster*
... and if krypton could indeed be considered as a cost-effective alternative for fueling Hall thrusters of the given size and power class. At the project guidelines formulation phase, it was accepted that the gradually improved implementation of the new engine should be a laboratory/research model of m ...
... and if krypton could indeed be considered as a cost-effective alternative for fueling Hall thrusters of the given size and power class. At the project guidelines formulation phase, it was accepted that the gradually improved implementation of the new engine should be a laboratory/research model of m ...
MAT04 Data Sheet
... 100 µA. Figures 2 and 3 show modified current mirrors designed for a current gain of two, and one-half respectively. The accuracy of these mirrors is reduced from that of the unity-gain source due to base current errors but is still better than 2%. ...
... 100 µA. Figures 2 and 3 show modified current mirrors designed for a current gain of two, and one-half respectively. The accuracy of these mirrors is reduced from that of the unity-gain source due to base current errors but is still better than 2%. ...
LP38843 3A Ultra Low Dropout Linear Reg
... ceramic which provides more phase margin to the loop, thereby allowing the use of a smaller output capacitor because adequate phase margin can be maintained out to a higher crossover frequency. The tantalum capacitor will typically also provide faster settling time on the output after a fast changin ...
... ceramic which provides more phase margin to the loop, thereby allowing the use of a smaller output capacitor because adequate phase margin can be maintained out to a higher crossover frequency. The tantalum capacitor will typically also provide faster settling time on the output after a fast changin ...
Thermal stability of the krypton Hall effect thruster*
... and if krypton could indeed be considered as a cost-effective alternative for fueling Hall thrusters of the given size and power class. At the project guidelines formulation phase, it was accepted that the gradually improved implementation of the new engine should be a laboratory/research model of m ...
... and if krypton could indeed be considered as a cost-effective alternative for fueling Hall thrusters of the given size and power class. At the project guidelines formulation phase, it was accepted that the gradually improved implementation of the new engine should be a laboratory/research model of m ...
An Analog Current Controller Design for Laser Diodes
... pairs) which could cause undesired modulation (side bands which potentially can royally screw up an atomic physics experiment). We also have a switch in front of this circuit in the housing which may be used to short out the diode circuit after switching it off before removing power connectors. the ...
... pairs) which could cause undesired modulation (side bands which potentially can royally screw up an atomic physics experiment). We also have a switch in front of this circuit in the housing which may be used to short out the diode circuit after switching it off before removing power connectors. the ...
Physics 517/617 Experiment 4 Transistors - 1 R I
... d) The AC input impedance of the transistor is ≈ βrBE (or hferbe ). A typical β is 100. Remember that β = hfe = IC/IB so for 1 mA of collector current the AC input impedance is ≈ (100)(25) = 2500 Ω. e) The DC input impedance of the transistor is ≈ βRE (or hfeRE). A typical value of RE is 1 kΩ. So th ...
... d) The AC input impedance of the transistor is ≈ βrBE (or hferbe ). A typical β is 100. Remember that β = hfe = IC/IB so for 1 mA of collector current the AC input impedance is ≈ (100)(25) = 2500 Ω. e) The DC input impedance of the transistor is ≈ βRE (or hfeRE). A typical value of RE is 1 kΩ. So th ...
OPA541 High Power Monolithic OPERATIONAL AMPLIFIER APPLICATIONS
... Commercially available heat sinks often specify their thermal resistance. These ratings are often suspect, however, since they depend greatly on the mounting environment and air flow conditions. Actual thermal performance should be verified by measurement of case temperature under the required load ...
... Commercially available heat sinks often specify their thermal resistance. These ratings are often suspect, however, since they depend greatly on the mounting environment and air flow conditions. Actual thermal performance should be verified by measurement of case temperature under the required load ...
MAX1725/MAX1726 12V, Ultra-Low I , Low-Dropout Linear Regulators
... IN to GND ................................................................-14V to +14V SHDN to GND ..............................................-0.3V to (VIN + 0.3V) (-0.3V to + 0.3V when VIN < 0V) OUT, FB (MAX1725 only) to GND...................-0.3V to +6V when VIN >5.7V; -0.3V to (VIN + 0.3V) wh ...
... IN to GND ................................................................-14V to +14V SHDN to GND ..............................................-0.3V to (VIN + 0.3V) (-0.3V to + 0.3V when VIN < 0V) OUT, FB (MAX1725 only) to GND...................-0.3V to +6V when VIN >5.7V; -0.3V to (VIN + 0.3V) wh ...
LM1084 5A Low Dropout Positive Regulators (Rev. F)
... 0.05Ω resistance between the regulator and load will have a load regulation due to line resistance of 0.05Ω x IL. If R1 (=125Ω) is connected near the load the effective line resistance will be 0.05Ω (1 + R2/R1) or in this case, it is 4 times worse. In addition, the ground side of the resistor R2 can ...
... 0.05Ω resistance between the regulator and load will have a load regulation due to line resistance of 0.05Ω x IL. If R1 (=125Ω) is connected near the load the effective line resistance will be 0.05Ω (1 + R2/R1) or in this case, it is 4 times worse. In addition, the ground side of the resistor R2 can ...
Thermal runaway
Thermal runaway refers to a situation where an increase in temperature changes the conditions in a way that causes a further increase in temperature, often leading to a destructive result. It is a kind of uncontrolled positive feedback.In other words, ""thermal runaway"" describes a process which is accelerated by increased temperature, in turn releasing energy that further increases temperature. In chemistry (and chemical engineering), this risk is associated with strongly exothermic reactions that are accelerated by temperature rise. In electrical engineering, thermal runaway is typically associated with increased current flow and power dissipation, although exothermic chemical reactions can be of concern here too. Thermal runaway can occur in civil engineering, notably when the heat released by large amounts of curing concrete is not controlled. In astrophysics, runaway nuclear fusion reactions in stars can lead to nova and several types of supernova explosions, and also occur as a less dramatic event in the normal evolution of solar mass stars, the ""helium flash"".There are also concerns regarding global warming that a global average increase of 3-4 degrees Celsius above the preindustrial baseline could lead to a further unchecked increase in surface temperatures. For example, releases of methane, a greenhouse gas more potent than CO2, from wetlands, melting permafrost and continental margin seabed clathrate deposits could be subject to positive feedback.