Sense Resistors Super LDORegulator Daryl Sugasawara Power Dissipa
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Sense Resistors Super LDORegulator Daryl Sugasawara
Power Dissipation power dissipation sense resistors used Super regulator circuits small generally does require power dissipation capability found most low-value resistors. Wire Resistance Table (Copper Wire)
Wire Size Resistance 20°C 10-6 32.70 41.37 52.09 65.64 82.80 104.3 131.8 165.8 209.5 263.9 332.3 418.9 531.4 666.0 842.1 1062.0 1345.0 1687.6 2142.7 2664.3 3402.2 4294.6 5314.9 6748.6 8572.8 10849 13608 16801 21266 27775 35400 43405 54429 70308 85072 10-6 83.06 105.1 132.3 166.7 210.3 264.9 334.8 421.1 532.1 670.3 844.0 1064.0 1349.8 1691.6 2138.9 2697.5 3416.3 4286.5 5442.5 6767.3 8641.6 10908.3 13499.8 17141.4 21774.9 27556.5 34564.3 42674.5 54015.6 70548.5 89916.0 110248.7 138249.7 178582.3 216082.9
Alternate Resistors low-value resistor made from length copper magnet wire from printed circuit board trace. Tables provided wire printed circuit traces. Copper positive temperature coefficient resistivity +0.39%/°C. This significant when higher accuracy current limiting required. Kelvin connection between sense element Super Regulator Controller improve accuracy current limit setpoint. Printed Circuit Copper Resistance
Conductor Thickness
1/2oz/ft2
Conductor Width 0.025 0.050 0.100 0.200 0.500 0.025 0.050 0.100 0.200 0.500 0.025 0.050 0.100 0.200 0.500 0.025 0.050 0.100 0.200 0.500
Resistance 39.3 19.7 9.83 4.91 1.97 19.7 9.83 4.91 2.46 0.98 9.83 4.91 2.46 1.23 0.49 3.25 1.63 0.81 0.325
(18µm)
(35µm)
oz/ft2
2oz/ft2 (70µm)
3oz/ft2 (106µm)
Kelvin Connections Kelvin connection measurement connection that avoids error caused voltage drop power path leads. Sense leads attached directly across resistance element-intentionally excluding power path leads. power sense Because sense conductors carry path leads negligible current (sense inputs typically high impedance voltage measurement inputs), there voltage 4-Lead Resistor drop skew measurement. 1997
4-Lead Resistor Manufacturers Dale Electronics, Columbus, (402) 563-6506 Vishay Resistors, Malvern, (215) 644-1300
Super trademark Micrel, Inc.
3-197
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