www.yageo.com Low-Ohmic Chip Resistors

Introduction The sensing voltage Vs is given by the simple relation: Yageo’s low-ohmic chip resistor ranges are the ideal replacement for traditional wirewound and leaded products in modern power control circuits. Based on the company’s thick film technology, these products exhibit far lower parasitic inductance than their wirewound and leaded counterparts. Vs = Io x Rsense Thermal EMF is an important consideration in low value resistors used in DC circuits. We utilize metal foil technology to produce resistors with low thermal EMF characteristics (below 0.03μV/°C). Features • Excellent T.C.R....

Tolerances on sensing resistance As mentioned earlier, the relation between low-ohmic resistance, feedback sensing voltage and output current is given by Rsense = Vs/Io. With an output ripple of 0.04, i.e. a 4% (± 2%) deviation on output current and a safety margin on the sensing voltage of -2%, the allowable deviation on Rsense is: 0.98 x Vs 0.98 x 1o Vs 0.85 x 1o With say, Vs= 100 mV and Io= 5 A, the allowable low ohmic sensing resistance must lie in the range 19.2mΩ to 20.4mΩ. Consideration of T.C.R. in current sensing applications The above discussion does not, of course, take into account...

DC/DC converter Low-Ohmic Chip Resistors The Figure 6 on the right shows the current detecting circuit of a DC/DC converter. The voltage across the current detecting resistor is fed back to control the output power. The resistance should be low to reduce power dissipation, and the resistor should stand against repeated rush current. Furthermore the self-inductance should be low for high frequency applications. Recommended types are Px series chip resistors. As for high frequency DC/DC converters, metal plate chip resistors PF series best fit in. Figure 6 DC/DC converter circuit Applications of...

Current Sensor Low TCR, Wide Terminal Max. Rated Power (W) 0306 5 ~ 100 1 PE (1) 0508 3 ~ 100 1.2 PE (1) 0612 1 ~ 9; 11 ~ 300 2 PE (1) 10 2 PF 0830 1 ~ 100 2 PF/PE (1) 0815 1 ~ 100 1 PE (1) 1225 1 ~ 100 3 PF/PE (1) Decision Tree Resistance Range (mR) Low-Ohmic Chip Resistors Case Size (1) PE suits battery application Current Sensor Low TCR, 4 Terminal Case Size Resistance Range (mR) Max. Rated Power (W) 0612 0.5, 0.75, 1 1 PS (1) 2 ~ 100 1 PS (1) 3 ~ 100 3 PS (1) 1225 (1) PS suits battery application 7

Jumper Chip Resistors Decision Tree (Thick Film Technology) Rated Current (A) 0402 50 1 RC 20 1.5 RL 10 3 PT 50 1 RC 20 2 RL 8 5 PT 50 2 RC 20 2.5 RL 5 6 PT 50 2 RC 20 3.5 RL 5 10 PT 0603 0805 1206 Decision Tree Max. Resistance (mR) Low-Ohmic Chip Resistors Case Size 9

Jumper Global part number Series RL0402-R-070RL RL0603-R-070RL RL0805-R-070RL Size Operating Temp. range Max. Resistance Rated Current 20mΩ 1.5A 20mΩ 2A 20mΩ 2.5A 0402 RL 0603 0805 -55°C to 155°C RL1206-R-070RL 1206 20mΩ 3.5A PT0402-R-070RL 0402 10mΩ 3A 8mΩ 5A 5mΩ 6A 5mΩ 10A PT0603-R-070RL PT0805-R-070RL PT PT1206-R-070RL 0603 0805 -55°C to 155°C 1206 Environmental characteristics Performance test Test method Procedure Requirements Life MIL-STD-202Gmethod 108A 1 000 hours at 70°C ±5°C applied RCWV 1.5 hours on, 0.5 hours off, still air required ±(1%+ 0.0005Ω) <20mΩ for jumper High temperature...

Explanation of ordering code PT 2512 F K - 07 Series name (code 1-2) RL = Thick film low ohmic PT = Thick film low ohmic low T. C. R. PA/PR/PF/PH/PE = Current sensor - low T. C. R. PS = 4 terminal, Current sensor Size code (inch / metric) (code 3-6) 0306 = 0.8 x 1.6 0402 = 1.0 x 0.5 0508 = 1.25 x 2.0 0603 = 1.6 x 0.8 0612 = 1.6 x 3.2 0805 = 2.0 x 1.25 0815 = 2.15 x 3.75 0830 = 2.0 x 7.5 1206 = 3.2 x 1.6 1210 = 3.2 x 2.5 1218 = 3.2 x 4.5 1225 = 3.2 x 6.3 2010 = 5.0 x 2.5 2512 = 6.35 x 3.2 4520 = 11.0 x 5.0 4527 = 11.0 x 7.0 0R1 L Default Code (code 17) L / Z = Default code Resistance (code 12-16)...

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