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Test Procedure
•
A DC ammeter is connected between UUT and load
•
Set the load for 5
Ω
/1000 mA
Jumper Settings
•
JP1
→
ILIM and FIX are shorted
•
JP2
→
CM_ILM and High are shorted
•
JP3
→
EN1 and Low are shorted
•
JP4
→
EN2 and Low are shorted
Voltage and Current Meters
•
Connect the ammeter to measure 19-V input current to the transmitter. Connect the voltmeter to
monitor the input voltage at J1 and J2 of TX unit. On UUT a voltmeter is used to measure output
voltage at J3 with ground at J4. Connect the ammeter to measure load current.
RFOD: R6 Set Up
•
Connect the ohmmeter between JP5 (FOD) and J4 (GND). Adjust R6 to a 495
Ω
reading on the
ohmmeter.
•
NOTE:
Sometimes the multimeter cannot read the more than 430
Ω
from the FOD resistor due to
charged up capacitors in the board. If that happens, use a twizer and short C15 for few seconds, then
measure again.
6.4
Procedure
The following operating procedures are provided at a variety of operating loads:
Turn ON Operation and Operation at 1000-mA Load
•
Turn ON transmitter power supply (19 V)
•
Transmitter – Verify LED D2 is
ON
•
UUT – Adjust load current to 1000 mA ±50 mA
•
Put the receiver EVM on the transmitter coil and align them correctly
•
After 5 seconds verify that:
–
Transmitter – Status LED D5 should be green, flashing approximately every 1 second
–
The transmitter should beep
–
Transmitter – LED D2 still ON
–
Receiver – LED D1 is ON
–
UUT – Verify that V
OUT
is 4.9 V to 5.15 V (between J3 and J4)
–
UUT – Verify that the rectified voltage is 5 V to 5.4 V (between TP3 and GND)
NOTE
: a modulation
signal is present on this voltage every 250 ms and may cause fluctuation in the reading: use lower
value or baseline.
Efficiency Test (1000-mA Load)
•
Verify that input current to the TX is less than 500 mA with input voltage at 19 VDC
•
Turn OFF the transmitter power supply (19 V)
Turn ON Operation and Operation at 500-mA Load
•
Turn ON the transmitter power supply (19 V)
•
Transmitter – Verify LED D2 is
ON
•
UUT – Adjust load current to 500 mA ±50 mA
•
Put the receiver EVM on the transmitter coil and align them correctly
•
After 5 seconds verify that:
–
Transmitter – Status LED D5 should be green, flashing approximately every 1 second.
–
The transmitter should beep
–
Transmitter – LED D2 still ON
8
bq51020EVM (5-W WPC) Integrated Wireless Receiver Power Supply
SLUUB03 – April 2014
Copyright © 2014, Texas Instruments Incorporated