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CMC7101AY Datasheet(PDF) 10 Page - California Micro Devices Corp |
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CMC7101AY Datasheet(HTML) 10 Page - California Micro Devices Corp |
10 / 10 page ©2000 California Micro Devices Corp. All rights reserved. 2/00 215 Topaz Street, Milpitas, California 95035 Tel: (408) 263-3214 Fax: (408) 263-7846 www.calmicro.com 10 CALIFORNIA MICRO DEVICES CMC7101A TAPE AND REEL SPECIFICATIONS CMC7101A Benefits 3.0 High Side Current Sense To monitor a load current it is necessary to insert a current sense resistor in the power supply feed, as shown in figure 4. The resulting voltage drop is proportional to the load current, but as both ends of this resistor are at (or very near to) the supply voltage, it is difficult to use a conventional Op Amp. The CMC7101A is ideal for this application as the inputs can operate at either supply rail (or at ground when used with a single supply). The output voltage is directly proportional to current in the load, scaled by the gain of the amplifier. To reduce the power loss in the sense resistor and also keep the supply voltage to the load immune to load current variations, a small value Rsense is used. An excellent application for this circuit is in a battery charger, where the charging current is monitored to detect end of charge (battery current will rise as the cells top off), and charging must be reduced to prevent damage (out gassing or over heating). The sense resistor can be placed in the negative side (known as Low Side Sensing), however this is less desirable due to disruption of the ground path. 3.1 Rail To Rail Output Swing Making smaller and lighter products requires the reduction of battery size, lowering of battery voltage, or both. The lower voltage products have less headroom, for a given signal swing, and this demands better amplifier performance. Rail To Rail Outputs help maintain the existing signal level when products are redesigned for lower voltage supplies. 3.2 Rail to Rail input Swing When the amplifier is used as a buffer, the input of the amplifier follows the input signal and if this is large compared to the available supply voltage, it is important that the Op Amp has a wide CMVR (Common Mode Voltage Range). RRIO Op Amps have a CMVR equal (or greater than) the supplies and this allows large signal swings without clipping or distortion. Figure 4 High Side Current Sense circuit CMC7101A Physical Dimensions For a complete mechanical drawing refer to http://www.calmicro.com/prod/data/package/sot-23.htm. |
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