TC7763WBG

2015-2-25

10

Figure 8.2 General outline of RX with the TC7763WBG

8.3 Control of TC7763WBG

8.3.1 Basic operation

The TC7763WBG incorporates a digital control circuit to realize communication with a TX. The TC7763WBG

starts Qi compliant communication when it receives power from a TX.

After a certain period of time with PVDD being not less than 7V during the Power Transfer Phase, the LDO can be

turned on. This is indicated by changing the STAT signal to “L”. The LDO is enabled only when STAT and XEN are

“L”. Figure 8.3 shows a basic operation sequence using an externally controlled XEN signal.

Figure 8.3 Basic operation (using XEN control)

-

+

AC adapter

SW_DET SW_EN

COM1

AC1

AC2

COM2

VOUT

PVDD

XEN

SCL

SDA

PGND

5V output

TC7763WBG

RX coil

Outside Load switch

PVDD

VOUT

XEN

STAT

5V

UVLO

(N-ch Open Drain output)

L

End Power Transfer (EPT)

After LDO OFF

EPT Transmit

EPT Transmit

External control

of XEN

LDO ON

L

7V

XEN=”L”

LDO automatic start

After LDO OFF

EPT Transmit