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LRZ Datasheet(PDF) 2 Page - Welwyn Components Limited |
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LRZ Datasheet(HTML) 2 Page - Welwyn Components Limited |
2 / 3 page High Current Jumper Chip LRZ Series © Welwyn Components Limited Bedlington, Northumberland NE22 7AA, UK Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com Issue B · 02.05 Application Notes Conventional thick film “zero-Ohm” jumper chips typically have up to 50mΩ resistance values and 1 to 2A current ratings. LRZ jumper chips offer a solution for currents over an order of magnitude greater by combining lower resistance values with better thermal conductivity. Care should be taken when designing the associated printed circuit board tracks to ensure that they can carry the required current without excessive heating, for example by using multiple layers thermally linked with many vias. Any temperature rise caused by power dissipated in the PCB tracks themselves should be allowed for when calculating the ambient temperature in order to determine whether power de-rating should be applied. The minimum recommended pad and trace areas close to the resistor stated under Electrical Data should be provided at each terminal. For multi-layer PCB’s, this minimum area requirement should be met by surface layers rather than buried layers. The actual solder pad area follows the normal design rules for chip resistors. LRZ jumper chips themselves can operate at a maximum temperature of 150˚C (see performance above). For conventionally soldered jumper chips, the joint temperature should not exceed 110˚C. This condition is met when the stated current levels at 70˚C are used. 100% 80% 120% 60% 40% 20% 0% 0 50 100 150 Derating Characteristic Ambient Temperature (˚C) 1000 10 0.1 1 10 100 1000 Pulse Duration (ms) 100 Continuous Pulse Performance LRZ1206 LRZ2010 LRZ2512 Temperature Derating Pulse Performance Welwyn Components Welwyn Components LRZ_B.qxd 2/16/05 3:49 PM Page 2 |
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