Texas Instruments bqTESLA bq500414Q, User Manual, Page: 2 / 29

Applications
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1 Applications
The bq500414QEVM-629 evaluation module demonstrates the transmitter portion of the bqTESLA™
wireless power system. This transmitter EVM is a complete transmitter-side solution that powers a
bqTESLA™ receiver. The EVM requires only input power for operation, 12 Vdc at 1 A. All transmitter-side
electronics and transmitter coils are on a single 4-layer printed-circuit board (PCB). The open design
allows easy access to key points of the electrical schematic.
This EVM has the following features:
• WPC A6-Type transmitter coil, 70 mm × 20 mm free positioning area
• Designed for 12-Vdc systems
• Optional input power SEPIC converter to produce 12 Vdc from 6 V to 16 V
• Fully WPC 1.1 Foreign Object Detection (FOD) and WPC 1.0 Parasitic Metal Object Detection (PMOD)
• Reduced parts count from the legacy bq500410A design
• LED indicates power transfer or power fault state
2 bq500414QEVM-629 Electrical Performance Specifications
Table 1 provides a summary of the EVM performance specifications. All specifications are given for an
ambient temperature of 25°C.
Table 1. bq500414QEVM-629 Electrical Performance Specifications
Parameter Notes and Conditions Min Typ Max Unit
Input Characteristics
V
IN
Input voltage bq500414Q 6 12 16 V
I
IN
Input current V
IN
= 12 V, RX I
OUT
= 1 A at 5 V 570 mA
Input no-load current V
IN
= 12 V, I
OUT
= 0 A 72 mA
Input stand-by current V
IN
= 12 V 18.75 mA
Output Characteristics – Receiver bq51013BEVM-764
V
OUT
Output voltage V
IN
= Nom, I
OUT
= Nom 4.5 5 5.1 V
Output ripple V
IN
= Nom, I
OUT
= Max 200 mV
PP
I
OUT
V
IN
= Min to Max V
IN
= Min to Max 0 1 A
Output overcurrent V
IN
= Nom 1.1 A
Systems Characteristics
F
S
Switching frequency Switching frequency varies with load 120 205 kHz
η pk Peak efficiency V
IN
= 12 V, P Out RX = 2.5 W 75%
η Full-load efficiency V
IN
= Nom, I
OUT
= Max 73.6%
3 Modifications
See the data sheet ( SLUSBE4 ) when changing components.
Use LED mode – resistor R23 to change the behavior of the status LED, D2, D8 and D9. The standard
value is 42.2 k
Ω
for control option 1, see the datasheet for additional settings.
FOD threshold setting can be changed using R3. If R3 is removed then FOD function is disabled.
PMOD threshold setting can be changed using R22. If R22 is removed then PMOD function is disabled.
FOD_CAL can be used to change the slope of the FOD LOSS curve for better FOD performance, R52.
Addition of EMI Filter Shield, PWR633 to reduce emissions, see section 6.2.2.6
2 bq500414Q bqTESLA Wireless Power TX EVM SLVUA40A – March 2014 – Revised January 2015
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