NXP Semiconductors AN11524 Installation and operating instructions

AN11524

NXQ1TXA6 Evaluation Board

Rev. 1 — 17 February 2015 Application note

Document information

Info Content

Keywords NXQ1TXA6, NWP2081, Wireless Charging, Qi, mobile devices, base

station, magnetic coupled power transfer

Abstract This document illustrates how to create a Qi A6 wireless power base

station. It uses the NXQ1TXA6 charging controller and its evaluation board

that can deliver up to 5 W effective output at the wireless mobile device

side

Application note Rev. 1 — 17 February 2015 2 of 54

Contact information

For more information, please visit: http://www.nxp.com

For sales office addresses, please send an email to: [email protected]

NXP Semiconductors AN11524

NXQ1TXA6 Evaluation Board

Revision history

Rev Date Description

v. 1.0 20150217 Initial version

Application note Rev. 1 — 17 February 2015 3 of 54

NXP Semiconductors AN11524

NXQ1TXA6 Evaluation Board

1. Introduction

The ubiquity of mobile phones, increases the requirement of a convenient way to charge

these devices while on the move. Especially the fast risingnumber of smart phones widely

used and relied upon in daily life. Wireless charging is introduced into smart phones and

tablets.

Wireless charging represents the future of public and private charging.

Qi (pronounced as "Chee") is a wireless charging standard developed by Wireless Power

Consortium (www.wirelesspowerconsortium.com) for inductive power.

The Qi system (see Figure 1) comprises a base station or a transmitter (TX) pad and a

mobile device or a compatible receiver (RX), such as a mobile phone. To use the system,

the mobile device is placed on top of the base station pad which charges the device via

electromagnetic induction.

The market demand for the convenience and safety of standard-compliant wireless power

systems continues to grow rapidly.

NXP offers Qi-compliant base station reference designs to set you immediately on your

way to a successful project. NXP supports several types of Qi base stations. This

document describes the application of an A6 type base station using NXQ1TXA6 charging

controller.

Fig 1. Wireless charging system as defined by Wireless Power Consortium

aaa-014485

BASE STATION

TRANSMITTER

COMM

messages

reflected load

power

CONTROL

SYSTEM

POWER CONVERSION

demod

MOBILE DEVICE

RECEIVER

CONTROLCOMM

LOAD

POWER PICK-UP

mod

Application note Rev. 1 — 17 February 2015 4 of 54

NXP Semiconductors AN11524

NXQ1TXA6 Evaluation Board

2. Scope

This document discusses the design of a WPC Qi A6 type base station based on the NXP

NXQ1TXA6 Evaluation Board. The NXQ1TXA6 Evaluation Board is Qi certified and it

complies with EMI regulation - EN55022 and FCC part 18.

The document is intended to provide engineers with real life practical design applications

and get them started on the right note immediately.

For all topics covered, hints are provided to ensure system-level best performance,

excellent EMC and lowest application cost.

Near Field Communication (NFC) option for tap to power on to enable zero power standby

and Bluetooth pairing is included. There are many other use cases and possibilities with

NFC technology but they are not within the scope of this application note.

Application note Rev. 1 — 17 February 2015 5 of 54

NXP Semiconductors AN11524

NXQ1TXA6 Evaluation Board

3. Getting started

3.1 Package contents

The evaluation kit contains the following items:

•NXP NXQ1TXA6 wireless charger evaluation board containing, see Figure 2:

–NXQ1TXA6 charger controller IC

–NWP2081 half-bridge level shift controller IC

–NX2020 MOSFETs

–NT3H1201 NTAG-I2C NFC forum tag

•AC 110 V/220 V – DC 12 V power supply containing:

–TEA1720B3T HV start-up fly-back controller for ultra-low no-load charger

applications up to 12 W

A mobile device to receive the power is not included in the evaluation package. Refer to

the WPC website for a list of certified Qi receivers to be used with the evaluation board. To

demonstrate NFC tap to power on, ensure that the receivers support both Qi wireless

charging and NFC technology.

Fig 2. Overview of the charging pad

aaa-015876

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NXP Semiconductors AN11524

NXQ1TXA6 Evaluation Board

3.2 Main features

The NXQ1TXA6 Evaluation Board demonstrates:

•A reference design with key components from NXP for wireless charging applications

based on inductive power transfer standard Qi.

•Shows additional benefits resulting from integration of NFC with wireless charging.

Enabling for example zero power standby with the “tap to power on” feature.

3.3 System efficiency

In Figure 3, the system efficiency of the evaluation board is shown using a standard off the

shelf receiver.

System efficiency is measured as the ratio of output power of the receiver to the input

power of the transmitter. Input power is averaged to take into account variation due to

communication between receiver and transmitter.

The quality of the components used in both the transmitter and the receiver, determine the

efficiency of the system.

3.4 Board overview

The evaluation board is shown in Figure 4. The left-hand side contains the charging area

where the mobile device should be placed. The top right side has the electronics to drive

the charging coil and communicate with the mobile device.

(1) outer coil 1

(2) center coil

(3) outer coil 2

Fig 3. System efficiency

output power (mW)

0 5,0004,0002,000 3,0001,000

aaa-015880

(%)

(1)

(2)

(3)

Application note Rev. 1 — 17 February 2015 7 of 54

NXP Semiconductors AN11524

NXQ1TXA6 Evaluation Board

The function of the switch and push buttons as well as the meaning of the status LED is

explained in the next subsections.

Fig 4. Switch, buttons and status LED location overview

aaa-015882

LED

stand-by power

mode switch

12 V DC

input

FOD

button

reset

button

charging area

Application note Rev. 1 — 17 February 2015 8 of 54

NXP Semiconductors AN11524

NXQ1TXA6 Evaluation Board

3.5 Stand-by power mode switch

The switch on the top of the board is not a power on/off switch. The switch is for

alternating between the “Normal” and the NFC “tap to power on” position as illustrated in

Figure 5.

In the Normal mode, the charging pad periodically monitors the coil for the presence of a

Qi receiver. It starts power transfer, once a Qi power receiver is detected.

In the NFC tap to power on mode, the charging pad electronics are disconnected from the

12 V supply. The presence of an NFC enabled phone, switches on the 12 V system

supply, enabling zero power in standby mode.

Important:

The present generation of NFC phones only performs periodic NFC operations when the

display of the phone is on and unlocked. It is only under this condition that the charging

pad is woken-up to start power transfer.

3.6 Reset button

Pressing the reset button marked SW101 on the board performs a reset of the charging

pad.

3.7 Foreign object detection button

By pressing the left-most button marked SW102 on the board, the charging pad enables

or disables Foreign Object Detection (FOD). This feature should be removed for final

products.

While charging, the green status LED indicates whether FOD is activated. When FOD is

active, the green LED blinks with a rate of 1 Hz. When FOD is disabled, the green LED

blinks with a rate of 3 Hz.

Fig 5. Standby-by power mode switch

aaa-015883

normal mode

position

NFC tap to

power on position

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NXP Semiconductors AN11524

NXQ1TXA6 Evaluation Board

3.8 Status LED

An overview of the status signaled by the LEDs is given in the following table:

3.9 NFC functionality

The evaluation board provides a passive tag functionality with NT3H1201 NTAG-I2C. The

NTAG-I2C is preprogrammed with a URL link to the NXP website. When most NFC

phones are put on the charger pad while the screen is active, an automatic link to the NXP

website is made.

Other content can be programmed into NTAG IC by using, for example, NXPs TagWriter.

Table 1. LED status indicator

LED status Description

Off If a 12 V DC supply is present, the pad is in the

operation mode as defined by the mode switch

Green blinking 1 Hz Ongoing power transfer - charging mobile

device, FOD enabled

Green blinking 3 Hz Ongoing power transfer - charging mobile

device, FOD disabled

Green permanently On Mobile device charged

Red blinking No power transfer

Error detected: Foreign object, temperature or

Receiver indicated error

Application note Rev. 1 — 17 February 2015 10 of 54

NXP Semiconductors AN11524

NXQ1TXA6 Evaluation Board

4. NXP product offering

The NXQ1TXA6 evaluation board was designed based on the NXP products listed in

Table 2. The part numbers are hyperlinked to the NXP website to provide quick access to

product information and data sheets.

Table 2. NXP components for wireless charger application

Type number Function Package Ordering

information

Version Description 12NC

NXQ1TXA6/001 Wireless charger

controller SOT865 HVQFN: plastic thermal enhanced very thin

quad flat package; no leads; 33 terminals;

body 7 7 0.85 mm

9353 039 36551

NWP2081T Half-bridge level-shift

controller IC SOT96 plastic small outline package; 8 leads; body

width 3.9 mm 9353 021 87518

NX3008NBKW 30 V, single N-channel

Trench MOSFET SOT323 plastic surface-mounted package; 3 leads 9340 656 35115

NX2020N2 30 V, single N-channel

Trench MOSFET SOT1220 plastic thermal enhanced ultra thin small

outline package; no leads; 6 terminals 9340 682 45115

BAS21 High-voltage switching

diodes SOT23 plastic surface-mounted package; 3 leads 9335 020 40215

BAT54S Schottky barrier diodes SOT23 plastic surface-mounted package; 3 leads 9339 763 80215

TL431 Adjustable precision

shunt regulator SOT23 plastic surface-mounted package; 3 leads 9352 932 76215

Optional

NT3H1201 NTAG-I2C NFC forum

type 2 Tag compliant IC

with I2C interface

SOT902 plastic extremely thin quad flat package; no

leads; 8 terminals 9353 028 43125

NX3008CBKS 30 V complementary N/P

channel Trench

MOSFET

SOT363 plastic surface-mounted package with

increased, 6 leads 9340 682 44115

NX2020P1 30 V, single P-channel

Trench MOSFET SOT1220 plastic thermal enhanced ultra thin small

outline package; no leads; 6 terminals 9340 656 39115

BAT54C Schottky barrier (double)

diodes SOT23 plastic surface-mounted package; 3 leads 9339 763 70215

TDA3663 LDO (or use DC-to-DC

RT8295A) SOT223 plastic surface-mounted package with

increased heatsink; 4 leads 9352 629 68135

TEA1720B3T 12 W HV start-up fly

back controller (SMPS) SOT96 plastic surface-mounted package; 8 leads 9353 026 97118

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