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BQ500410A Datasheet(PDF) 11 Page - Texas Instruments

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Part # BQ500410A
Description  Free Positioning, Qi Compliant Wireless Power Transmitter Manager
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
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BQ500410A Datasheet(HTML) 11 Page - Texas Instruments

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bq500410A
www.ti.com
SLUSB96 – NOVEMBER 2012
The bq500410A
Description of Operation
The bq500410A pings the surroundings in 400-ms intervals by sequentially firing the three coils in the array. The
COMM feedback signal is multiplexed through analog switches and is synchronized to the coil being driven. To
select the best coil match, the bq500410A looks for the strongest COMM signal. The coil is engaged and driven,
note that only one coil is driven at a time. The driven coil is tolerant of slight misalignment of the RX while power
is being transferred. Actually displacing the RX to an adjacent coil while charging is allowable, the sequential
ping sequence and detection to determine the best matching coil to drive continues to repeat.
Capacitor Selection
Capacitor selection is critical to proper system operation. The total capacitance value of 2 nF x 68 nF (+5.6-nF
center coil) is required in the resonant tank. This is the WPC system compatibility requirement, not a guideline.
NOTE
A total capacitance value of 2 nF x 68 nF/100 V (68 nF + 5.6 nF center coil) (C0G
dielectric type) is required in the resonant tank to achieve the correct resonance
frequency.
The capacitors chosen must be rated for at least 100 V and must be of a high quality C0G dielectric (sometimes
also called NP0). These are typically available in a 5% tolerance, which is adequate. The use of X7R types or
below is not recommended if WPC compliance is required because critical WPC Certification Testing, such as
the minimum modulation or ensured power requirements, might fail.
The designer can combine capacitors to achieve the desired capacitance value. Various combinations can work
depending on market availability. All capacitors must be of C0G types, not mixed with any other dielectric types.
Copyright © 2012, Texas Instruments Incorporated
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