PolyZen Device Helps Protect Portable Electronics from Charger-Induced Failure

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1 PPLITION NOTE from harger-induced Failure automotive power buses. utomotive power buses are notoriously dirty. lthough they are nominally V, they can range in normal operation from V to V. Still, battery currents can exceed mps and be stopped instantly via a relay or fuse, generating large inductive spikes on the bus and increasing voltage by five times or more. lthough typical computer power supplies provide regulated lines at V +/-%, and V +/-%, under certain circumstances the voltage at these lines may exceed.v and.v, causing damage to the system or unprotected peripherals. Voltage spikes can occur when there is inductance in the power bus and a rapid change in current occurs. This change can result from a hot disconnect of a peripheral, an internal system shutdown, or other internal power fluctuations. The widespread availability of external and universal power supplies has made charger-induced system failure a leading cause of device warranty returns. esigning in additional safeguards to help prevent damage that may be caused by the use of unauthorized charging systems is complicated by the fact that the solution itself must accommodate smaller electronic packages. The most cost-effective way to implement a power bus for portable electronics is with a standard barrel jack. However, because this connector is so commonly used, the user may accidentally connect the incorrect power supply to electronic equipment at home or while traveling. Faults may also occur when using commercially available universal power supplies that come with a variety of connectors. These devices allow the user to dial in the voltage to levels as high as V, as well as switch polarity. Transient protection is especially critical when designing peripherals that may be powered off computer buses and Under the new US 3. specification, high-powered devices will be able to source up.9 of current, and new types of powering devices, such as Powered- connector devices, may provide up to, as opposed to. in the US. specification. These higher current applications require more reliable and robust circuit protection to help prevent damage caused by overvoltage transients and overcurrent conditions. PolyZen devices are designed to help lock out inappropriate power supplies. The device is particularly effective at clamping and smoothing inductive voltage spikes. In response to an inductive spike, the device s Zener diode element shunts current to ground until the voltage is reduced to the normal operating range. In the case of a wrong-voltage power supply, the device clamps the voltage, shunts excess power to ground, and eventually locks out the wrong supply. The relatively flat voltage vs. current response of the PolyZen device helps clamp the output voltage, even when input voltage and source currents vary. It helps provide coordinated protection with a component that protects like a Zener diode, but is capable of withstanding very-high-power fault conditions without requiring any special heat-sinking structures beyond normal P traces. Littelfuse, Inc.

2 PPLITION NOTE from harger-induced Failure Typical ircuit On oard Protection Power onditioning ( to converter output) Regulated Power Source Power onnector PolyZen evice Source Power onnector to PolyZen evice To Peripheral Power onnector Electrical haracteristics (Performance unless otherwise specified) V Z V INT MX I FLT MX I HOL Test Test I R Typ R MX V INT MX urrent I FLT MX Voltage Part Number Min Typ Max () () (Ω) (Ω) () () ZENV3LS /- +/- ZEN9V3LS /- +/- ZENV3LS /- +/- ZEN9V3LS /- +/- ZEN3V3LS /- +/- ZENV3LS /- +/- ZENV3LS /- +/- ZENV3LS /- +/- ZEN9V3LS /- +/- ZEN3V3LS /- +/- ZENV7LS /- +/- ZEN3V7LS /- +/- ZENVLS /- +/- ZENV3YM /- +/- ZENV7YM /- +/- ZEN3V3YM /- +/- ZEN3V7YM /- +/- ZENV3Y /- +/- ZENV3Y /- +/- ZENVY /- +/- ZEN3V3Y /- +/- ZEN3V3Y /- +/- ZEN3VY /- +/- LS module height is.7mm typical. YM module height is.mm typical. Y module height is.3mm typical. Typical operating current is which meets US suspend mode requirement. Littelfuse, Inc.

3 PPLITION NOTE from harger-induced Failure Typical Performance urves Figure PZ Peak Peak vs I FLT = ). = ZENVyyLS/GS. E = ZENV3LS. = ZEN9V3LS. = ZEN3V3LS. E = ZENV3LS I FLT RMS () Figure PZ3 Time-to-Trip (Sec) Time-to-Trip vs I FLT = ) = ZENVyyLS/GS = ZENV3LS = ZEN9V3LS = ZEN3V3LS E = ZENV3LS E I FLT RMS () Figure PZ Peak Peak vs I FLT = ) = ZENV3LS = ZENV3LS = ZEN3V3LS I FLT RMS () Figure PZ Time-to-Trip (Sec). Time-to-Trip vs I FLT = ) = ZENV3LS = ZENV3LS = ZEN3V3LS I FLT RMS () Figure PZ Peak Peak vs I FLT = ) = ZENxxxVyyLS/GS = ZENxxxV3LS = ZENxxxV7LS/M I FLT RMS () Figure PZ7 Time-to-Trip vs I FLT = ) Time-to-Trip (Sec) = ZENxxxVyyLS/GS = ZENxxxV3LS = ZENxxxV7LS/M I FLT RMS () 3 Littelfuse, Inc.

4 PPLITION NOTE from harger-induced Failure Typical Performance urves Figure PZ Temperature Effect on I HOL (I FLT = ) Figure PZ9 Time-to-Trip vs I PT RMS (I FLT = ) IHOL () mbient Temperature ( ) = ZENxxxV3LS/GS = ZENxxxV3LS = ZENxxxV7LS/M = ZENxxxVLS Time-to-Trip (Sec) I PT RMS () = ZENxxxVyyLS/GS = ZENxxxV3LS = ZENxxxV7LS/M Figure PZ Peak Peak vs. I FLT = ).. = ZENVyyzzYM = ZEN3V3YM. = ZEN3V7YM I FLT RMS () Figure PZ Time-to-Trip vs. I FLT = ) = ZENV3YM = ZENV7YM = ZEN3V3YM = ZEN3V7YM I FLT RMS () Figure PZ Peak vs. I FLT = ) Figure PZ3 Time-to-Trip vs. I FLT = ) Peak = ZENV3YM = ZENxxxVyyzzYM.. = ZENV3YM = ZEN3V3YM = ZENxxxV7YM I FLT RMS () I FLT RMS () Littelfuse, Inc.

5 PPLITION NOTE from harger-induced Failure Typical Performance urves Figure PZ Temperature Effect on I HOL (I FLT = ) Figure PZ Time-to-Trip vs. I PT RMS (I FLT = ) 3. = ZENxxxV3YM = ZENxxxV7YM = ZENxxxV3YM = ZENxxxV7YM I HOL () mbient Temperature ( ). 3 I PT RMS () Figure PZ Peak vs. I FLT = ) Figure PZ7 Time-to-Trip vs. I FLT = ) Peak = ZENVyyyzzY = ZEN3V3Y = ZEN3VyyY = ZENV3Y = ZEN3V3Y = ZENVyyY = ZEN3VyyY I FLT RMS () I FLT RMS () Figure PZ Peak Peak vs. I FLT = ) = ZENV3Y = ZENVyyY = ZEN3V3Y = ZEN3VyyY Figure PZ9. Time-to-Trip vs. I FLT = ) = ZENV3Y = ZENVyyY = ZEN3V3Y = ZEN3VyyY I FLT RMS () I FLT RMS () Littelfuse, Inc.

6 PPLITION NOTE from harger-induced Failure Typical Performance urves Figure PZ Temperature Effect on I HOL (I FLT = ) Figure PZ Time-to-Trip vs. I PT RMS (I FLT = ) I HOL () = ZENxxxV3Y = ZENxxxV3Y = ZENxxxVY. = ZENxxxV3Y = ZENxxxVyyY mbient Temperature ( ). 3 I PT RMS () asic Operation Examples Figure PZ Voltage and urrent () 3 3 apacitive urrent Spike urrent Pulled to GN via diode Hot-Plug Response ZENV3LS vs a V/W Universal Power Supply Supply Voltage dropped by current Supply Voltage returns to normal PPT switches to high resistance Peak Time (Sec) Output Voltage remains clamped = V IN = = URRENT (I FLT ) = POWER 3 3 Power (Watts) Littelfuse, Inc.

7 PPLITION NOTE from harger-induced Failure asic Operation Examples Figure PZ3 Voltage or urrent () Typical Fault Response: ZENVLS V, 3. urrent Limited Source (I OUT =) = VIN = VOUT = IFLT () Figure PZ Typical Fault Response: ZEN9V3LS V, urrent Limited Source (I OUT =) Voltage or urrent () = VIN = VOUT = IFLT ().... Figure PZ Voltage or urrent () Typical Fault Response: ZENV3LS V,. urrent Limited Source (I OUT =) = VIN = VOUT = IFLT () Figure PZ Voltage or urrent () Typical Fault Response: ZEN9V3LS V, 3. urrent Limited Source (I OUT =) = VIN = VOUT = IFLT ().... Figure PZ7 Voltage or urrent () 3 = VIN = VOUT = IFLT () Typical Fault Response: ZEN3V3LS V,. urrent Limited Source (I OUT =) Figure PZ Voltage or urrent () 3 = VIN = VOUT = IFLT () Typical Fault Response: ZENV3LS V,. urrent Limited Source (I OUT =) Littelfuse, Inc.

8 PPLITION NOTE from harger-induced Failure asic Operation Examples Figure PZ9 Voltage or urrent () = VIN = VOUT = IFLT () Typical Fault Response: ZENV3LS V,. urrent Limited Source (I OUT =) Figure PZ3 Voltage or urrent () = VIN = VOUT = IFLT () Typical Fault Response: ZENV3LS V, 3. urrent Limited Source (I OUT =) Figure PZ3 Voltage or urrent () Typical Fault Response: ZEN9V3LS V, 3. urrent Limited Source (I OUT =) = VIN = VOUT = IFLT ().... Figure PZ3 Voltage or urrent () Typical Fault Response: ZEN3V3LS V,. urrent Limited Source (I OUT =) = VIN = VOUT = IFLT () Figure PZ33 Voltage or urrent () 3 = VIN = VOUT = IFLT () Typical Fault Response: ZENV7LS V,. urrent Limited Source (I OUT =)...3. Figure PZ3 Voltage or urrent () Typical Fault Response: ZEN3V7LS V,. urrent Limited Source (I OUT =) = VIN = VOUT = IFLT () Littelfuse, Inc.

9 PPLITION NOTE from harger-induced Failure asic Operation Examples Figure PZ3 Figure PZ3 Typical Fault Response: ZENV3YM V/3 urrent Limited Source (I OUT = ) Typical Fault Response: ZENV7YM V/3 urrent Limited Source (I OUT = ) Voltage or urrent () = V IN = = I FLT ().... Voltage or urrent () = V IN = = I FLT ().... Figure PZ37 Voltage or urrent () Typical Fault Response: ZEN3V3YM V/ urrent Limited Source (I OUT = ) = V IN = = I FLT () Figure PZ3 Typical Fault Response: ZEN3V7YM V/ urrent Limited Source (I OUT = ) Voltage or urrent () = V IN = = I FLT () Figure PZ39 Typical Fault Response: ZENV3Y V/3 urrent Limited Source (I OUT = ) Voltage or urrent () = V IN = = I FLT () Figure PZ Voltage or urrent () Typical Fault Response: ZENV3Y V/3 urrent Limited Source (I OUT = ) = V IN = = I FLT () Littelfuse, Inc.

10 PPLITION NOTE from harger-induced Failure asic Operation Examples Figure PZ Voltage or urrent () Typical Fault Response: ZENVY V/3 urrent Limited Source (I OUT = ) = V IN = = I FLT () Figure PZ Voltage or urrent () Typical Fault Response: ZEN3V3Y V/ urrent Limited Source (I OUT = ) = V IN = = I FLT () Figure PZ3 Typical Fault Response: ZEN3V3Y V/ urrent Limited Source (I OUT = ) Figure PZ Typical Fault Response: ZEN3VY V/ urrent Limited Source (I OUT = ) Voltage or urrent () = V IN = = I FLT () Voltage or urrent () = V IN = = I FLT () Littelfuse, Inc.

11 PPLITION NOTE from harger-induced Failure enefits Helps shield downstream electronics from overvoltage and reverse bias Trip events shut out overvoltage and reverse bias sources nalog nature of trip events minimize upstream inductive spikes Helps reduce design costs with single component placement and minimal heat sinking requirements pplications ell phones Ps Personal Navigation evices MP3 players V players igital cameras US hubs Printers Scanners Hard isk rives esk phones PX phones Features Hold currents up to. Power handling on the order of 3 watts Stable VZ vs. fault current Time delayed, overvoltage trip Time delayed, reverse-bias trip Power handling on the order of watts Integrated device construction RoHS compliant Summary The PolyZen device s unique ability to withstand high inrush currents make it suitable to help protect portable electronics and other lowpower devices such as cell phones, Ps, MP3 players, digital cameras and US hubs. Transient protection is particularly important for peripherals that can be powered off computer buses and automotive power buses. PolyZen devices are designed to help lock out inappropriate power supplies and are especially effective at clamping and smoothing inductive voltage spikes. Notice: Information furnished is believed to be accurate and reliable. However, users should independently evaluate the suitability of and test each product selected for their own applications. Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, military, aerospace, medical, life-saving, lifesustaining or nuclear facility applications, devices intended for surgical implant into the body, or any other application in which the failure or lack of desired operation of the product may result in personal injury, death, or property damage) other than those expressly set forth in applicable Littelfuse product documentation. Warranties granted by Littelfuse shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse documentation. Littelfuse shall not be liable for any claims or damages arising out of products used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse documentation. The sale and use of Littelfuse products is subject to Littelfuse Terms and onditions of Sale, unless otherwise agreed by Littelfuse. Littelfuse, Inc.