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...in an operating (hot) system, the converter must be able to withstand at its input the instantaneous input voltage without disturbing the operation of the system. The input capacitance of the DC/DC converter must be charged instantaneously to (hot) VIN. In non-hot pluggable DC/DC converters, the input current...

The design procedure for determining the capacitor value and calculating stresses is also examined. Surface mount ceramic X5R or X7R capacitors are ideally suited for AnalogicTech's buck converter (Figure 1). X5R ceramic capacitors have a CV product with a temperature and voltage coefficient...

Microchip Technology's TC1121 is a charge pump voltage converter specified to have a 100mA output current capability. The TC1121 has the benefits of selecting different internal charge pump switching frequencies (10KHz or 200KHz), driving the charge pump from an external clock, and a low power...

Inductor-based, step-up switching regulators offer high efficiency, small size and lower cost than isolated switching regulators (DC/DC converters). They are used to amplify (step up) the voltage of a lower voltage source or battery. The inductor stores energy during the on time of the switching...

Synchronous rectification (SR) is used in DC/DC converters when low output voltage is less than 5V and high current is needed. Synchronous rectification utilizes power MOSFETs to rectify the output voltage of the power transformer. These MOSFETs are synchronized to the converter frequency...

...flexure cracks, reducing the risk of field failures. The capacitors are also available with polymer terminations, which increase board flex. Optimized for applications including buck and boost dc-to-dc converters, voltage multipliers for...

There are 3 primary components of noise in a light to voltage converter: * Thermal noise of the feedback resistor. * Shot noise of the photo current. * Circuit noise. The TSL257 uses a 50 M? resistor in a Tee feedback network with a gain of 6.4 to achieve an effective resistance of 320 M?. The 50 M...

Microchip Technology Inc.'s TC1219 (switching frequency at 12 kHz) and TC1220 (switching frequency at 35 kHz) are inverting charge pump voltage converters that are specified using rather large capacitors (10 µF for the TC1219 and 3.3 µF for the TC1220). These capacitor sizes allow the designer...

...a similar task. Light incident on those devices affects the voltage and resistance across their leads. And we might be able to get away with measuring resistance on the Stamp with the command RCTIME, but the result would be an ever varying time base, subject to moisture, lead length, temperature...

...field, a voltage is induced across the conductor at right angles to the current flow. The strength of that induced voltage indicates the relative strength of the magnetic field. In Hall-effect sensors, current to be measured passes through a shunt path. This path is extremely low resistance, typically...

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  • new products
    ...scanner an inter- face loop, an a-d converter and a frequency counter... ...has four d-c voltage ranges from 300 V to 300 mV full scale... ...voltage ranges and six resistance ranges (300 ohms to... ...full scale), reports the manufacturer Hewlett.
  • Plant Electrophysiology
    More expensive models may have some additional features (sometimes, these features are not used), such as current clamp and two-electrode voltage clamp circuits, wide range of capacitance and series resistance corrections, precision filtering (note: electronic filtering by soft- ware gives similar... Patch-clamp set-up usually consists of patch-clamp amplifier which is con- nected to computer via analogue–digital converter (interface) and controlled by professional electrophysiology software (all these components are produced by the manufacturer of amplifier), inverted microscope (most models will be...
  • Review of the State-of-the-Art in Power Electronics Suitable for 10-KW Military Power Systems
    ...the market-proven inverter circuit could be “lifted�? from the motor drive product and designed into a 10-kW power converter product with necessary modifications/redesign... ...cooling system, (5) shock/impact resistance , and (6) the addition of filtering if contracted to the inverter manufacturer . In many cases, the inverter circuit will be able to accept the voltage supplied to it by...