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US202 Datasheet(PDF) 7 Page - Unisonic Technologies |
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US202 Datasheet(HTML) 7 Page - Unisonic Technologies |
7 / 7 page US202 Preliminary CMOS IC UNISONICTECHNOLOGIESCO.,LTD 7 of 7 www.unisonic.com.tw QW-R502-445.b APPLICATION INFORMATION (Cont.) Layout and Thermal Dissipation The switch should be placed as close to the USB connector as possible and all traces should be as short as possible to reduce the effect of undesirable parasitic inductance. Also, place the output capacitor and ferrite beads to the USB connector as close to as possible. If ferrite beads are used, use wires kept to a minimum resistance and large solder pads to minimize connection resistance. If the package is with dual VOUT or VIN pins, short both the same function pins as Fig.1 or Fig.2 to reduce the internal turn-on resistance. If the output power is delivered to two individual ports, it is specially necessary to short both VOUT pin at the switch output side in order to protect the switch when each port are plug-in separately. Under normal operating conditions, the package can dissipate the channel heat away. Wide power bus planes connected to VIN and VOUT and a ground plane in contact with the device will help dissipate additional heat. TYPICAL APPLICATION CIRCUIT GND CIN 1µF COUT (Note) 470µF CE VOUT VOUT VIN VOUT Note: 470µF, Low ESR Electrolytic VIN UTC assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all UTC products described or contained herein. UTC products are not designed for use in life support appliances, devices or systems where malfunction of these products can be reasonably expected to result in personal injury. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice. |
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