CURRENT SENSING RESISTOR KRL SERIES- Susumu Co. Ltd. Thin Film Innovator

CURRENT SENSING RESISTOR KRL SERIES- Susumu Co. Ltd. Thin Film Innovator

OUTLINE -CURRENT SENSING RESISTOR KRL SERIES- 1 STRUCTURE 2 SEVERAL ADVANTAGES WITH COMPARISON DATA 3 APPLICATION MANUAL

STRUCTURE (3) (1) (1) (2) (6) (4) Metal plate attached to Alumina with epoxy sheet to protect resistive element 1. Substrate Alumina 96% 2. Resistive element Metal plate 3. Electrode Cu+ Ni+Sn 4. Protective coating Epoxy resin 5. Marking Epoxy resin (Black) 6. Adhesive Adhesive(Epoxy) * Thermal conductive and shock absorber 3

COMPARISON HEAT DISSIPATION Competition KRL

COMPARISON HEAT DISSIPATION The surface temperature when applying 3W Competition KRL3264E-R050-F 300.0 268.8 237.5 206.3 175.0 143.8 112.5 81.3 50.0 300.0 268.8 237.5 206.3 175.0 143.8 112.5 81.3 50.0 a 277.84 E = 0.95 a 187.07 E = 0.95

0.00 W 0.25 W 0.50 W 0.75 W 1.00 W 1.25 W 1.50 W 1.75 W 2.00 W 2.25 W 2.50 W 2.75 W 3.00 W Susumu Co. Ltd. Thin Film Innovator COMPARISON HEAT DISSIPATION The surface temperature increasing comparison between KRL3264 and competition 300 250 200 150 100 KRL KOA Surface of temperature is measured when mounting on the glass epoxy board. Our competition of resistor is increased 160% compared with our KRL series 50 0

SMALL TCR Conventional type Equivalent circuit TCR Big + TCR Small + TCR Big = TCR Big KRL Equivalent circuit TCR Small Sample 25 125 TCR KRL9045-M-R010 9.982mΩ 9.991mΩ 9.0ppm/ Competitor 9.461mΩ 9.942mΩ 508ppm/

Output voltage (mv) Susumu Co. Ltd. Thin Film Innovator SMALL POWER COEFFICIENT OF RESISTANCE KRL Series has a small PCR comparably and can detect current accurately in the whole current range KRL3216-M-R010 R value at room temp.: 10.128m Ohm TCR 21.0ppm/ Error at 1w current sensing: 0.52% Actual Ideal Applied current (A)

0.00 W 0.25 W 0.50 W 0.75 W 1.00 W 1.25 W 1.50 W 1.75 W 2.00 W 2.25 W 2.50 W 2.75 W 3.00 W Susumu Co. Ltd. Thin Film Innovator PCR COMPARISON Apply current and measure voltage. Voltage / Current = Resistance value 4.0% 3.0% 2.0% 1.0% STD KRL KOA C 0.0% -1.0% -2.0% Competition Resistive element of temperature becomes high and results in drifting resistance value based on its TCR. The diagram shows that the resistance drift can be confirmed over 3 % at 3W. KRL Resistive element of temperature stays low due to the good heat dissipation to the mounting board. And Its TCR is quite small, so the resistance drift rate can be confirmed within 1%.

ESL(pH) Susumu Co. Ltd. Thin Film Innovator LOW ESL (SERIES INDUCTANCE) ESL Charateristic(5~100mΩ) 1000 900 800 700 600 500 R091 R075 R061 R050 R022 R015 R025 R010 R005 R007 400 100 1000 f(mhz) Inductance value and its distribution are small

インダクタンス (nh) Susumu Co. Ltd. Thin Film Innovator ESL COMPARISON (SERIES INDUCTANCE) インダクタンス値 Inductance value I n d u c t a n c e ( n H ) 7.0 nh 6.0 nh 5.0 nh 4.0 nh 3.0 nh 2.0 nh 1.0 nh 0.0 nh 0MHz 200MHz 400MHz 600MHz 800MHz 1000MHz Frequency MHz 周波数 (MHz) Com SLN2 KRL50110

LOW NOISE Control. Without KRL) 標準基板を挿入した時のパルス波形 Output: 278.45mV Pulse width: 1.011 ns Rise time: 0.116 ns Fall time: 0.100 ns 測定結果出力電圧 (Vpp): 278.45mV パルス幅 : 1.011ns 立ち下がり時間 : 0.100ns 立ち上がり時間 : 0.116ns オシロスコープ各試料通過パルスジェネレータ 標準基板 図 2. 測定試料外観 With KRL KRL9045 実装基板を挿入した時のパルス波形 測定結果 Output: 出力電圧 (Vpp): 278.37mV パルス幅 : 1.011ns Pulse 立ち下がり時間 width: ns : 0.105ns 立ち上がり時間 : 0.185ns Rise time: 0.185 ns Fall time: 0.105 ns

SHEAR DEFORMATION/ STRESS CTE: Linear coefficient of thermal expansion CTE of alumina substrate: CTE of glass epoxy (RF4) substrates: The difference between the two: about 7ppm/ about 20ppm/ 13ppm/ The larger the size, the bigger the expansion, and the larger the stress. Example: 10mm (component length) x 20ppm / (CTE) = 0.2μm/ (expansion per 1 ) If the temperature difference is 100, the total expansion is 20μm 13

SHEAR DEFORMATION/STRESS (COMPETITION) Condition : -55 30min Room temp 3min +155 30min Room temp 3min Alumina substrate Lead free solder チップ抵抗器 ( アルミナ基板 ) 無鉛はんだガラスエポキシ基板 (FR4) Glass epoxy (FR4) board Ceramic Type Plate Type After 2000H, crack was confirmed.

SHEAR DEFORMATION/ STRESS Condition : -55 30min Room temp 3min +155 30min Room temp 3min Alumina substrate チップ抵抗器 ( アルミナ基板 ) Buffer( adhesive バッファ層 resin) ( 接着樹脂 ) 抵抗体 Resistive element 無鉛はんだ Lead free ガラスエポキシ基板 solder (FR4) Glass epoxy (FR4) board After 2000 cycles (Cross section) After 3000 cycles (Cross Section)

抵抗値変化 (%) Susumu Co. Ltd. Thin Film Innovator TEMPERATURE CYCLE TEST RESULT Condition : -55 30min Room temp 3min +155 30min Room temp 3min KRL11050 Temperature Cycle test KRL11050 温度サイクル試験 R e s i s t a n c e C h a n g e 2 1.5 1 0.5 0-0.5-1 -1.5 Average 平均 Min 最小値最大値 Max ( % ) -2 0 100 250 500 750 1000 2000 3000 Number of Cycle サイクル数 ( 回 ) 16

THERMAL ELECTROMOTIVE FORCE Thermal electromotive force could occur in the different metal material connection with the temperature difference between them. The chip resistor of the electrode is the layered structure. Sectional View Electrode: Cu+ Ni+Sn In case of the temperature difference in the circle, thermal electrode force could occur

熱起電力 (mv) Susumu Co. Ltd. Thin Film Innovator THERMAL ELECTROMOTIVE FORCE COMPARISON E M F ( m V ) 0.20 0.15 0.10 0.05 BPR58-10mΩ C (KOA) KRL9045-C-R030 KRL9045-M-R010 0.00-0.05 0 10 20 30 40 50 60 Time 時間 (sec) (Sec) This is 各低抵抗器に the voltage waveform 4Wを3 as 分間印加し電源を soon as 4W applied OFF for each にした直後の電圧波形 resistors for 3 minutes and off

KRL SERIES LINE UP Electrode Part Number Power Resistance range size(inch) Short Wide Short Terminal KRL0816E- -****- - 0.3W 0603 10m - 100mohm (E-12) KRL1220E- -****- - 0.5W 0805 KRL1632E- -****- - 0.75W 5.6.7.8.9mohm 10-500mohm (E-12) 1206 KRL3264E- -****- - 2.0W 5.6.7.8.9mohm 2512 KRL50110E- -****- - 5.0W 10-1000mohm (E-12) 4320 KRL2012E- -****- - 1.0W 0805 KRL3216E- -****- - 1.5W 1206 KRL6432E- -****- - 3.0W 1.2.3.4.5.6.78.9.mohm 2512 KRL7638E- -****- - 4.0W 10-1000mohm (E-12) 3015 KRL9045E- -****- - 5.0W 3518 KRL11050E- -****- - 6.0W 4320 : Working Temperature Range * : Resistance Value 4 digit : Resistance Tolerance : Packaging Wide Terminal Electric characteristics Resistance Range 5m-9mohm 10mohm 1mohm 2mohm 3mohm Tolerance +/-2.0%(G) '+/-1.0%(F) +/-5.0%(G) '+/-2.0%(G) '+/-1.0%(F)

APPLICATION EXAMPLE-1 High precision current sensing (Hi-side) 1 to 3 mω

APPLICATION EXAMPLE-2 Breaker

APPLICATION EXAMPLE-3 Monitor for speed control

APPLICATION EXAMPLE-4 Monitor for current

ADVANTAGE OF SUMMARY - Effective heat dissipation-high power rating - No hot spot, even heat distribution, no heat damage to component and PC boards - Low TCR - Low ESL low noise - Low thermal EMF - Small Power Coefficient of resistance - Temperature cycle resistance - Two terminal types with various standard sizes and resistance as low as 1m Ω