Analog Circuit Design A Tutorial Guide to Applications and by Bob Dobkin

By Bob Dobkin

Analog circuit and method layout this day is extra crucial than ever prior to. With the expansion of electronic platforms, instant communications, complicated commercial and automobile platforms, designers are challenged to boost subtle analog options. This accomplished resource booklet of circuit layout options will reduction structures designers with stylish and useful layout strategies that concentrate on universal circuit layout demanding situations. The books in-depth software examples offer perception into circuit layout and alertness strategies that you should observe in todays tough designs.

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18 uses a logic signal to toggle between a high charge rate, up to 2A, or a trickle rate for keep alive. An LT1006 amplifier senses the current into the battery and drives the feedback pin of an LT1171 switching regulator. The entire control circuit is bootstrapped to the LT1171 and floats at the switching frequency, so stray capacitance must be minimized. A gain setting transistor changes the gain on the LT1006 by shorting or opening resistor R1. 1A and 1A. 19 is programmable with a voltage from D-A converters.

When the MOSFET is off, the 124k resistor is disconnected and the feedback pin floats high, turning off the converter. When off, output voltage sits at battery voltage minus a diode drop. This condition is approved for Flash memory. Inadvertent programming cannot occur as the Flash chip contains a level detector. 26 * Flash Memory VP-P Generator Delivers 12V, 40mA from 4AA Input allow programming to take place. Another low-battery detect function is provided using the LT1173’s gain block. 0V. Finally, a micropower two-terminal reference and dual comparator form a pair of battery detectors.

This ability, coupled with its micropower current demands and protection features, makes it an excellent choice for high side switching applications which previously required more expensive P-channel MOSFETs. 21 is a good example of an application which benefits directly from this high side driving scheme. A 4cell, NiCad battery pack can be used to power a 5V notebook computer system. Inexpensive N-channel power MOSFETs have very low ON resistance and can be used to switch power with low voltage drop between the battery pack and the 5V logic circuits.

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