Datenblatt-Suchmaschine für elektronische Bauteile |
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AD22001 Datenblatt(PDF) 6 Page - Analog Devices |
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AD22001 Datenblatt(HTML) 6 Page - Analog Devices |
6 / 8 page AD22001 REV. A –6– resistance track. Bends in the track make the effective L/W more difficult to calculate, however, certain common cases have been evaluated. To calculate the resistance of a track of width W with a 180 ° bend at radius W/2 resulting in a spacing W, add a resistance equivalent to 2.96 squares to account for the bend. Solving the resistance equation for L/W, L/W = R/ ρ S = 10.769 m Ω/0.25 mΩ/sq, or L/W = 43 squares. Subtracting out the bend, the remainder is 40.04 squares. Converting this to linear dimensions gives 4.004" at W = 0.1". AD22001 4 5 0.05" 0.1" 0.1" 2.002" 2.002" TO LAMP (Not to Scale) 0.1" Figure 5. PCB Track Shunt Resistor with One 180 ° Bend As shown in Figure 5, the contacts are made to the resistor section of the track at 2.002" from the bend. The bend has a uniform width of W, which is 0.1" in this case, and a radius of W/2. As a result, the aspect ratio of the straight sections plus the bend total 2.96 squares + (2.002" + 2.002")/0.1" or 43 squares. The straight sections need not be of equal length, so long as They have the proper total, and the shorter one is longer than about 3W. A shorter resistor can be made by using more bends and reducing the linear portion. For example, with three bends the total length of four linear sections would be: (43 squares – 3 2.96 squares/Bend)W or (43 – 8.88) 0.1"= 3.412". Assuming equal linear sections, the contacts and the bends should be made at spacings of 3.412"/4 = 0.853", as shown in Figure 6. AD22001 4 5 0.05" 0.1" 0.1" 0.1" 0.853" TO LAMP (Not to Scale) 0.853" FROM SWITCH Figure 6. PCB Track Shunt Resistor with Two 180 ° Bends A 90 ° bend with an inside radius of W/2 and a smooth width of W adds 0.341 squares to the aspect ratio as shown in Figure 7. Note that the linear measurements are differently made at the 90 ° and the 180° bend. Other styles of bend can be used with minor variation in total resistance, however, we do not recommend the use of sharp inside corners on high current conductors in general and shunt resistors in particular. Sharp inside corners result in very high local current density and poor resistance repeatability. W W 2 W L2 L1 Figure 7. PCB Track Shunt Resistor with 90 ° Bend |
Ähnliche Teilenummer - AD22001_15 |
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Ähnliche Beschreibung - AD22001_15 |
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