BQ500414Q Datasheet, PDF (22/34 Pages) Texas Instruments – Qi Compliant Wireless Power Transmitter Manager

bq500414Q
SLUSBE4B – JANUARY 2014 – REVISED JUNE 2014
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Typical Application (continued)
9.2.3 Application Performance Plots
The system efficiency with A6 Tx type coil is shown in Figure 10. The SEPIC converter that provides 12-V
causes some efficiency drop.
80
No SEPIC Converter
70
60
50
With SEPIC Converter
40
30
20
10
Without SEPIC
With SEPIC
0
0
1
2
3
4
5
Output Power (W)
C002
Figure 10. System Efficiency With A6 Tx Type Coil, With
and Without SEPIC Converter
80
No SEPIC Converter
70
60
50
With SEPIC Converter
40
30
20
10
0
0
Without SEPIC
With SEPIC
1
2
3
4
5
Output Power (W)
C002
Figure 0. UNDEFINED
The frequency shift operation is shown in the Qi Sniffer capture in Figure 10. The Rx is placed on the Tx with no
load. The operating frequency is 154-kHz. Then a FREQ_SHIFT command is issued through I²C, to shift the
operating frequency to 190-kHz for 50,000-ms. After requested 50,000 ms, the operating frequency goes back to
its previous operating frequency, which is 154-kHz.
Figure 11. Qi Sniffer Capture of Frequency Shift Operation
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