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Low Rho (LoRho) PPTC KK Wu Product Manager

`. Low Rho (LoRho) PPTC KK Wu Product Manager. What is Rho. L. Rho ( ρ ) is resistivity ρ is material specific The resistance of a conductive material depends on the resistivity, area and length of it. Same size of material, the lower resistivity, the lower R. L A. ρ. R = ρ. A.

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Low Rho (LoRho) PPTC KK Wu Product Manager

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  1. ` Low Rho (LoRho) PPTC KK Wu Product Manager

  2. What is Rho L • Rho (ρ) is resistivity • ρ is material specific • The resistance of a conductivematerial depends on theresistivity, area and length of it. • Same size of material, the lower resistivity, the lower R. L A ρ R = ρ A L = length A = Area

  3. Lo Rho SMD PTC introduction • New technology from material level • Carbon Black Ceramic powder • Polyethylene Improved bonding to foil • Benefits • Holding Current ▲ • Resistance ▼ • Size / Thickness ▼

  4. New SL series SMD PPTC devices Low resistance SMD PPTC Devices (SL Series) • Similar to regular SMD PPTC, but different material to reduce resistance & profile to fit into PCM module (<0.75mm) • Space and resistance demanding applications like battery pack OC protection. • Reduce inventory cost & shorten design & approval period for battery applications • Products • 1812L190SL • 1210L200SL • 1206L110SL, 1206L150SL • 0805L110SL

  5. New 06SL190G PTC battery strap NEW • Advanced PTC strap for high efficiency battery pack application. • Major electrical characteristics: Ihold at 1.9A, Vmax 6V and Imax 50A, Rmin 0.006, Rmax 0.013 & R1max 0.024ohm • Production ready to ramp up

  6. Advantages of SL PPTC • By offering super low resistance, ensure a low Voltage drop in application • Possibility of long cable in the design • Increased endurance of battery • Flexibility of power trace design 54% 64%

  7. Advantages of SL PPTC • 2) High Hold Current with small footprint

  8. Advantages of SL PPTC 3) Comply with the latest UL/IEC 60950-1:2500(2nd edition) • To Provide the most reliable protection under high current limiting scenarios, ratings with hold Current less than 3.5A are able to meet 8A/5S

  9. LoRho PTC applications • High Ihold solution (Extreme motherboard) • Space is limited (Netbook) • Height is limited (Mobile Internet Device) • USB 3.0 ( low Voltage Drop is required)

  10. Lo Rho PTC for Battery application • Lo Rho SMD PTC in Battery PCM modules • Ultra low resistance • Labor saving • Battery strap / Spot welding  SMD / Automation Assembly • Easier to assemble • Lo Rho Strap • Ultra low resistance

  11. Appendix • PPTC basics

  12. PTC Characteristics and Device Physics • PTC Electrical Characteristics • PTC represents the Positive Temperature Coefficient, the resistance increases as temperature goes up. • PTC device is made of polymer which is the plastic material used to produce the resettable PTC • PTC device is resettable that will reset when cooled as compared to the action of a typical “one time” fuse

  13. PTC Characteristics and Device Physics PPTC Current Conduction Mechanism Conductive material (Carbon Black) is blended with non-conductive polymer (High Density Poly-Ethylene) Normal Operation: Carbon black is concentrated between the polymer crystal boundaries and provides a low resistance path Overload: At critical temperature (achieved through i2R heating), polymer volume expands as crystals melt, breaking the carbon black chains. The result is a very high resistance path. Resetting: The fault must be removed, then the device will begin to cool. As it cools, the carbon black is pushed back into the crystal boundaries and resistance will decrease back to a value close to its initial value.

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