EPC EPC9129 User manual

Demonstration
System EPC9129
Quick Start Guide
6.78 MHz, 33 W Class 4 Wireless Power System
using EPC8010/EPC2038/EPC2019/EPC2016C
Revision 1.0

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Demonstration System EPC9129
DESCRIPTION
The EPC9129 wireless power demonstration system is a high eciency,
AirFuelTM Alliance compatible, Zero Voltage Switching (ZVS), voltage
mode class-D wireless power transfer demonstration kit capable of
delivering up to 33 W into a transmit coil while operating at 6.78 MHz
(Lowest ISM band). The purpose of this demonstration system is to
simplify the evaluation process of wireless power technology using
eGaN® FETs.
The EPC9129 wireless power system is comprised of the four boards
(shown in gure 1), namely:
1) A Source Board (Transmitter or Power Amplier) EPC9512
2) A Class 4 AirFuel compliant Source Coil (Transmit Coil)
3) A Category 3 AirFuel Alliance compliant Receive Device EPC9513
4) A Category 5 AirFuel Alliance compliant Receive Device EPC9514
The amplier board (EPC9512) features the enhancement-mode,
100 V rated EPC8010 eGaN FET as the main power stage in a dual half
bridge conguration; the 100 V rated EPC2038 eGaN FET used as the
synchronous bootstrap FET, and the 200 V rated EPC2019 eGaN FET
used in the SEPIC pre-regulator. The amplier can be set to operate in
either dierential mode or single-ended mode and includes the gate
driver(s), oscillator, and feedback controller for the pre-regulator that
ensures operation for wireless power control based on the AirFuel
standard. This allows for compliance testing to the AirFuel class 4
standard over a load range as high as ±35j Ω.
The EPC9512 can operate in either single-ended or
dierential mode by changing a jumper setting. This allows
for high eciency operation with load impedance ranges
suitable for single ended operation.
The circuits used to adjust the timing for the ZVS class-D
ampliers have been separated to further ensure highest
possible eciency setting. Each half bridge also includes
separate ZVS tank circuits.
The amplier is equipped with a pre-regulator controller
that adjusts the voltage supplied to the ZVS class-D
amplier based on the limits of 3 parameters: coil current,
DC power delivered to the ZVS class-D amplier, and
maximum operating voltage of the ZVS class-D amplier.
The coil current has the lowest priority followed by the
power delivered and amplier supply voltage having
the highest priority. Changes in the device load power
demand, physical placement of the device on the source
coil and other factors, such as metal objects in proximity
to the source coil, contribute to variations in coil current,
DC power, and amplier voltage requirements. Under any
of these conditions, the controller will ensure the correct
operating conditions for the ZVS class-D amplier based
on the AirFuel standard. The pre-regulator can be bypassed
to allow testing with custom control hardware. The board
further allows easy access to critical measurement nodes for accurate
power measurement instrumentation hookup. A simplied diagram of
the amplier board is given in gure 2.
The source and device coils are AirFuel compliant and have been pre-
tuned to operate at 6.78 MHz with the EPC9512 amplier. The source
coil is AirFuel class 4 compliant and the device coils are AirFuel category 3
and category 5 compliant.
The EPC9513 (Category 3) device board includes a high frequency
Schottky diode based full-bridge rectier, DC smoothing capacitor
and 5 V regulator. The regulator is based on a SEPIC converter that
features a 200 V EPC2019 eGaN FET. The power circuit is attached to
the backside of the coil which is provided with a ferrite shield that
prevents the circuit from shunting the coil’s magnetic eld.
The EPC9514 (Category 5) device board includes a high frequency
Schottky diode based full-bridge rectier, DC smoothing capacitor
and 19 V regulator. The regulator is based on a SEPIC converter that
features a 100 V EPC2016C eGaN FET. The power circuit is attached
to the side of the coil.
For more information on the EPC8010, EPC2038, EPC2019, or
EPC2016C please refer to the datasheet available from EPC at
www.epc-co.com. The datasheet should be read in conjunction
with this quick start guide.
Figure 1: EPC9129 demonstration system.
EPC9512
Amplier Board
60 mm
58 mm
115 mm
228 mm
152 mm
EPC9513
Category 3
Device Board
150 mm
EPC9514
Category 5
Device Board
63 mm
79 mm

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Demonstration System EPC9129
MECHANICAL ASSEMBLY
The assembly of the EPC9129 Wireless Demonstration kit is simple and
shown in gure 1. The source coil and amplier have been equipped with
SMA connectors. The source coil is simply connected to the amplier. The
device board do not need to be mechanically attached to the source coil.
The coil sets of the EPC9111 and EPC9112 (both the source and device
coils) are not compatible with the EPC9129 kit. To prevent inadvertent
connection of either, the connectors of the amplier and coils have been
changed from reverse polarity to standard polarity. Please contact EPC
for modications to the original coil set to ensure compatibility with the
EPC9512 amplier.
It is recommended to insert a thin plastic insulator on top of the source
coil to prevent accidental contact during operation when locating the
device coils that can prevent damage to the amplier.
DETAILED DESCRIPTION
The Amplier Board (EPC9512)
Figure 2 shows the system block diagram of the EPC9512 ZVS class-D
amplier with pre-regulator and gure 3 shows the details of the ZVS
class-D amplier section. The pre-regulator is used to control the ZVS
class-D wireless power amplier based on three feedback parameters
1) the magnitude of the coil current indicated by the green LED, 2) the
DC power drawn by the amplier indicated by the yellow LED and 3)
a maximum supply voltage to the amplier indicated by the red LED.
Only one parameter at any time is used to control the pre-regulator
with the highest priority being the maximum voltage supplied to the
amplier followed by the power delivered to the amplier and lastly the
magnitude of the coil current. The maximum amplier supply voltage
is pre-set to 80 V and the maximum power drawn by the amplier is
pre-set to 33 W. The coil current magnitude is pre-set to 1.375 ARMS but
can be made adjustable using P25. The pre-regulator comprises a SEPIC
converter that can operate at full power from 17.4 V through 24 V. If the
system is operating in coil current limit mode, then the green LED will
illuminate. For power limit mode, the yellow LED will illuminate. Finally,
when the pre-regulator reaches maximum output voltage the red LED
will illuminate indicating that the system is no longer able to operate to
the AirFuel standard as the load impedance is too high for the amplier
to drive. When the load impedance is too high to reach power limit or
voltage limit mode, then the current limit LED will illuminate incorrectly
indicating current limit mode. This mode also falls outside the AirFuel
standard and by measuring the amplier supply voltage across TP1 and
TP2 will show that it has nearly reached its maximum value limit.
The pre-regulator can be bypassed by connecting the positive supply
directly to the ZVS class-D amplier supply after removing the jumper
at location JP1 and inserting the jumper into location JP50 to disable
the pre-regulator followed by connecting the main positive supply to
the bottom pin of JP1.
JP1 can also be removed and replaced with a DC ammeter to directly
measure the current drawn by the amplier. When doing this observe
a low impedance connection to ensure continued stable operation of
the controller. Together with the Kelvin voltage probes (TP1 and TP2)
connected to the amplier supply, an accurate measurement of the
power drawn by the amplier can be made.
The EPC9512 is also provided with a miniature high eciency switch-
mode 5 V supply to power the logic circuits on board such as the gate
drivers and oscillator.
The amplier comes with its own low supply current oscillator that is
pre-programmed to 6.78 MHz ± 678 Hz. It can be disabled by placing
a jumper into JP70 or can be externally shutdown using an externally
controlled open collector / drain transistor on the terminals of JP70
(note which is the ground connection). The switch needs to be capable
of sinking at least 25 mA. An external oscillator can be used instead of
the internal oscillator when connected to J70 (note which pin is the
ground connection) and the jumper (JP71) is removed.
Table 1: Performance Summary (TA= 25°C) EPC9512
Symbol Parameter Conditions Min Max Units
VIN Bus Input Voltage Range –
Pre-Regulator Mode Also used in bypass mode for logic supply 17.4 24 V
VIN Amp InputVoltage Range – Bypass Mode 0 80 V
VOUT Switch-Node OutputVoltage 80 V
IOUT Switch-Node Output Current (each) 1.8* A
Vextosc External Oscillator InputThreshold Input‘Low’ -0.3 0.8 V
Input‘High’ 2.4 5 V
VPre_Disable Pre-Regulator DisableVoltage Range Floating -0.3 5.5 V
IPre_Disable Pre-Regulator Disable Current Floating -10 10 mA
VOsc_Disable Oscillator DisableVoltage Range Open Drain/Collector -0.3 5 V
IOsc_Disable Oscillator Disable Current Open Drain/Collector -25 25 mA
VsgnDi Dierential or Single-Select Voltage Open Drain/Collector -0.3 5.5 V
IsgnDi Dierential or Single-Select Current Open Drain/Collector -1 1 mA
* Maximum current depends on die temperature – actual maximum current will be subject to switching
frequency, bus voltage and thermals.
Table 2a: Performance Summary (T
A
= 25°C) EPC9513 - Category 3 Device Board
Symbol Parameter Conditions Min Max Units
VUnreg Un-regulated output voltage 38 V
IUnreg Un-regulated output current 1.5*A
VUnreg_UVLOR UVLO Enable Un-regulated voltage rising 10.96 V
VUnreg_UVLOF UVLO Disable Un-regulated voltage falling 5.96 V
VOUT Output Voltage Range VUnreg_min = 8.3 V 4.8 5.1 V
IOUT Output Current Range VUnreg_min = 8.3 V 0 1*A
Table 2b: Performance Summary (TA= 25°C) EPC9514
Symbol Parameter Conditions Min Max Units
VUnreg Un-regulated output voltage 12.5 48 V
IUnreg Un-regulated output current 1.4* A
VUnreg_UVLOR UVLO Enable Un-regulated voltage rising 25 V
VUnreg_UVLOF UVLO Disable Un-regulated voltage falling 12.5 V
VOUT Output Voltage Range VUnreg_min = 8.3 V 18.75 19.25 V
IOUT Output Current Range VUnreg_min = 12.5V 0 1.4* A
* Actual maximum current subject to operation temperature limits.
* Actual maximum current subject to operation temperature limits.

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Demonstration System EPC9129
The pre-regulator can also be disabled in a similar manner as the
oscillator using JP50. However, note that this connection is oating
with respect to the ground so removing the jumper for external
connection requires a oating switch to correctly control this function.
Refer to the datasheet of the controller IC and the schematic in this
quick start guide for specic details.
The ZVS timing adjust circuits for the ZVS class-D ampliers are each
independently settable to ensure highest possible eciency setting
and includes separate ZVS tank circuits.
Additional protection features
An undervoltage-lockout circuit has been implemented for the input
voltage (VIN). The amplier board will not start unless VIN reaches its
minimum required value specied in table 1.
A clamp diode also protects the board from VIN over-voltage for a
brief period and accidental reverse polarity connection with up to
11 A current protection.
On-O-Key (OOK) modulation
On-O-Key (OOK) modulation (as illustrated in gure 6) can be
implemented by applying the modulation signal at J76. It is
compatible with 5 V logic only. When the signal is high, the power
stage functions normally; when the signal is low, the gate drive signal
of one half-bridge is shut o. Therefore, for optimal performance,
the signal should be synchronized with the oscillator signal. The
modulation signal should also change state between the oscillator
states and must complete an even number of clock cycles. Failure
to follow this will lead to DC voltage shift on the ZVS capacitor (Czvs)
and other harmonic generation issues in the amplier output. The
OOK modulation frequency will also become present and thus could
lead to radiated emission violations if the frequency exceeds what is
allowed in the ISM band.
When not using OOK modulation, J76 should be left open – an on-
board pull-up resistor keeps the level high.
Single ended or Dierential Mode operation
The EPC9512 amplier can be operated in one of two modes; single-
ended or dierential mode. Single ended operation oers higher
amplier eciency but reduced imaginary impedance drive capability.
If the reected impedance of the tuned coil load exceeds the capability
of the amplier to deliver the desired power, then the amplier can be
switched over to dierential mode. In dierential mode, the amplier
is capable of driving an impedance range of 1 Ω through 56 Ω and
±35j Ω and maintains either the 1.375 ARMS coil current or deliver up to
33 W of power. The EPC9512 is set by default to dierential mode and
can be switched to single ended mode by inserting a jumper into J75.
When inserted the amplier operates in the single-ended mode.
Using an external pull down with oating collector drain connection
will have the same eect. The external transistor must be capable of
sinking 25 mA and withstand at least 6 V.
For dierential mode only operation, the two ZVS inductors LZVS1 and
LZVS2 can be replaced by a single inductor LZVS12 and by removing CZVS1
and CZVS2.
ZVS Timing Adjustment
Setting the correct time to establish ZVS transitions is critical to
achieving high eciency with the EPC9512 amplier. This can be
done by selecting the values for R71, R72, R77, and R78 or P71, P72,
P77, and P78 respectively. This procedure is best performed using a
potentiometer installed at the appropriate locations that is used to
determine the xed resistor values. The procedure is the same for
both single-ended and dierential mode of operation. The timing
MUST initially be set WITHOUT the source coil connected to the
amplier. The timing diagrams are given in gure 12 and should
be referenced when following this procedure. Only perform these
steps if changes have been made to the board as it is shipped
preset. The steps are:
1. With power o, remove the jumper in JP1 and install it into JP50 to
place the EPC9512 amplier into Bypass mode. Connect the main
input power supply (+) to JP1 (bottom pin for bypass mode) with
ground connected to J1 ground (-) connection.
2. With power o, connect the control input power supply bus (19 V)
to (+) connector (J1). Note the polarity of the supply connector.
3. Connect a LOW capacitance oscilloscope probe to the probe-hole
of the half-bridge and the ground post.
4. Turn on the control supply – make sure the supply is approximately
19 V.
5. Turn on the main supply voltage starting at 0 V and increasing
to the required predominant operating value (such as 24 V but
NEVER exceed the absolute maximum voltage of 80 V).
6. While observing the oscilloscope adjust the applicable
potentiometers to achieve the green waveform of gure 12.
7. Repeat for the other half-bridge.
8. Replace the potentiometers with xed value resistors if required.
Remove the jumper from JP50 and install it back into JP1 to
revert the EPC9512 back to pre-regulator mode.
Determining component values for LZVS
The ZVS tank circuit is not operated at resonance, and only provides
the necessary negative device current for self-commutation of the
output voltage at turn o. The capacitors CZVS1 and CZVS2 are chosen
to have a very small ripple voltage component and are typically
around 1 µF. The amplier supply voltage, switch-node transition
time will determine the value of inductance for LZVSx which needs
to be sucient to maintain ZVS operation over the DC device load
resistance range and coupling between the device and source coil
range and can be calculated using the following equation:
Where:
Δtvt = Voltage Transition Time [s]
ƒSW = Operating Frequency [Hz]
COSSQ = Charge Equivalent Device Output Capacitance [F]
Cwell = Gate driver well capacitance [F]. Use 20 pF for the LM5113
LZVS =
∆
t
vt
8 f
sw
(COSSQ + Cwell )
(1)

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Demonstration System EPC9129
NOTE. The amplier supply voltage VAMP is absent from the equation
as it is accounted for by the voltage transition time. The COSS of the
EPC8010 eGaN FETs is on the same order of magnitude as the gate
driver well capacitance Cwell which as a result must now be included
in the ZVS timing calculation. The charge equivalent capacitance of
the eGaN FETs can be determined using the following equation:
(2)
To add additional immunity margin for shifts in coil impedance, the
value of LZVS can be decreased to increase the current at turn o
of the devices (which will increase device losses). Typical voltage
transition times range from 2 ns through 8 ns. For the dierential case
the voltage and charge (COSSQ) are doubled when calculating the ZVS
inductance.
The Source Coil
Figure 4 shows the schematic for the source coil which is Class 4
AirFuel compliant. The matching network includes only series tuning.
The matching network series tuning is dierential to allow balanced
connection and voltage reduction for the capacitors.
The Device Boards
Figure 5 shows the basic schematic diagram of the EPC9513 and
EPC9514 device boards which comprises a tuning circuit for the device
coil with a common-mode choke for EMI suppression, a high frequency
rectier and SEPIC converter based output regulator. The EPC9513 is
powered using a Category 3 AirFuel Alliance compliant device coil and
the EPC9514 is powered using a Category 5 AirFuel Alliance compliant
device coil Both are by default tuned to 6.78 MHz for the specic coil
provided with it. The tuning circuit comprises both parallel and series
tuning which is also dierential to allow balanced connection and
voltage reduction for the capacitors.
The device boards have have limited over-voltage protection using a
TVS diode that clamps the un-regulated voltage to 38 V (EPC9513) or
46 V (EPC9514) . This can occur when the receive coil is placed above
a high power transmitter with insucient distance to the transmit
coil and there is little or no load connected. During an over-voltage
event, the TVS diode will dissipate a large amount of power and the red
LED will illuminate indicating an over-voltage. The receiver should be
removed from the transmitter as soon as possible to prevent the TVS
diode from over-heating.
The EPC9513 and EPC9514 can be operated with or without the
regulator. The regulator can be disabled by inserting a jumper into
position JP50 and connecting the load to the unregulated output
terminals. In regulated mode, the design of the EPC9513 and EPC9514
controller will ensure stable operation in a wireless power system. The
regulator operates at 280 kHz (EPC9513) or 300 kHz (EPC9514) and the
controller features over current protection that limits the load current
to 1 A for the EPC9513 and 2 A for the EPC9514.
The EPC9513 and EPC9514 device boards come equipped with Kelvin
connections for easy and accurate measurement of the un-regulated
and regulated output voltages. The rectied voltage current can also
be measured using the included shunt resistor. In addition, the EPC9513
and EPC9514 have been provided with a switch-node measurement
connection for low inductance connection to an oscilloscope probe to
yield reliable waveforms.
The EPC9513 is designed to operate in conjunction with EPC9127
(10 W EPC9510) , EPC9128 (16 W EPC9509), EPC9129 (33 W EPC9512) and
EPC9121 (10 W EPC9511) transmitter units. The EPC9514 is designed to
operate in conjunction with EPC9129 (33 W EPC9512) transmitter units.
QUICK START PROCEDURE
The EPC9129 demonstration system is easy to set up and evaluate the
performance of the eGaN FET in a wireless power transfer application.
Refer to gure 1 to assemble the system and gures 8, 9, and 10 for
proper connection and measurement setup before following the testing
procedures.
The EPC9512 can be operated using any one of two alternative methods:
a. Using the pre-regulator
b. Bypassing the pre-regulator
a. Operation using the pre-regulator
The pre-regulator is used to supply power to the amplier in this mode
and will limit the coil current, power delivered or maximum supply voltage
to the amplier based on the pre-determined settings.
The main 19 V supply must be capable of delivering 2.3 ADC. DO NOT turn
up the voltage of this supply when instructed to power up the board,
instead simply turn on the supply. The EPC9512 board includes a pre-
regulator to ensure proper operation of the board including start up.
1. Make sure the entire system is fully assembled prior to making
electrical connections and make sure jumper JP1 is installed. Also
make sure the source coil and device coil with load are connected.
2. With power o, connect the main input power supply bus to J1 as
shown in gure 8. Note the polarity of the supply connector.
3. Make sure all instrumentation is connected to the system.
4. Turn on the main supply voltage to the required value (19 V).
5. Once operation has been conrmed, observe the output voltage and
other parameters on both the amplier and device boards.
6. For shutdown, please follow steps in the reverse order.
b. Operation bypassing the pre-regulator
In this mode, the pre-regulator is bypassed and the main power is
connected directly to the amplier. This allows the amplier to be
operated using an external regulator.
Note: In this mode there is no protection for ensuring the correct
operating conditions for the eGaN FETs.
When in bypass mode it is crucial to slowly turn up the supply voltage
starting at 0 V. Note that in bypass mode you will be using two supplies;
one for logic and the other for the amplier power.
1. Make sure the entire system is fully assembled prior to making
electrical connections and make sure jumper JP1 has been removed
and installed in JP50 to disable the pre-regulator and to place the
EPC9512 amplier in bypass mode. Also make sure the source coil and
device coil with load are connected.
COSSQ =
V
AMP
∫
0
V
AMP
COSS (v) dv
1

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Demonstration System EPC9129
2. With power o, connect the main input power supply bus +VIN to the
bottom pin of JP1 and the ground to the ground connection J1 as
shown in gure 8.
3. With power o, connect the control input power supply bus to J1. Note
the polarity of the supply connector. This is used to power the gate
drivers and logic circuits.
4. Make sure all instrumentation is connected to the system.
5. Turn on the control supply – make sure the supply is 19 V range.
6. Turnonthemain supplyvoltage totherequiredvalue(itis recommended
to start at 0 V and do not exceed the absolute maximum voltage of 80V).
7. Once operation has been conrmed, adjust the main supply voltage
within the operating range and observe the output voltage, eciency
and other parameters on both the amplier and device boards.
8. For shutdown, please follow steps in the reverse order. Start by reducing
the main supply voltage to 0 V followed by steps 6 through 2.
NOTE.
1. When measuring the high frequency content switch-node (Source Coil Voltage), care
must be taken to avoid long ground leads. An oscilloscope probe connection (preferred
method) has been built into the board to simplify the measurement of the Source Coil
Voltage (shown in gure 11).
2. AVOID using a Lab Benchtop programmable DC as the load for the category 3 and
category 5 device boards. These loads have low control bandwidth and will cause
the EPC9129 system to oscillate at a low frequency and may lead to failure. It is
recommended to use a xed low inductance resistor as an initial load. Once a design
matures, a post regulator, such as a Buck converter, can be used.
Go to www.epc-co.com periodically for updates on new wireless power device demon-
stration boards capable of delivering a regulated output.
THERMAL CONSIDERATIONS
The EPC9129 demonstration system showcases the EPC8010, EPC2019,
EPC2038, and EPC2016C in a wireless energy transfer application.
Although the electrical performance surpasses that of traditional
silicon devices, their relatively smaller size does magnify the thermal
management requirements. The operator must observe the temperature
of the gate driver and eGaN FETs to ensure that both are operating within
the thermal limits as per the datasheets.
NOTE. The EPC9129 demonstration system has limited current and thermal protection
only when operating o the Pre-Regulator. When bypassing the pre-regulator there is no
current or thermal protection on board and care must be exercised not to over-current or
over-temperature the devices. Excessively wide coil coupling and load range variations
can lead to increased losses in the devices.
Pre-Cautions
The EPC9129 demonstration system has no enhanced protection
systems and therefore should be operated with caution. Some specic
precautions are:
1. Never operate the EPC9129 system with a device board that is AirFuel
compliant as this system does not communicate with the device
to correctly setup the required operating conditions and doing so
can lead to failure of the device board. Please contact EPC should
operating the system with an AirFuel compliant device be required
to obtain instructions on how to do this. Please contact EPC at
[e-mail] should the tuning of the coil be required to suit
specic conditions so that it can be correctly adjusted for use with the
ZVS class-D amplier.
2. There is no heat-sink on the devices and during experimental
evaluation it is possible present conditions to the amplier that may
cause the devices to overheat. Always check operating conditions and
monitor the temperature of the EPC devices using an IR camera.
3. Never connect the EPC9512 amplier board into your VNA in an
attempt to measure the output impedance of the amplier. Doing so
will severely damage the VNA.
Figure 3: Diagram of EPC9512 ZVS class-D amplier circuit.
Figure 2: Block diagram of the EPC9512 wireless power amplier.
+
VAMP
Q1_a LZVS12
Q2_a
Q1_b
Q2_b
LZVS2
CZVS2 CZVS1
LZVS1
Coil connection
Single
Ended
Operation
Jumper
Pre-regulator
Pre-regulator
jumper
JP1
J1
VIN
Bypass mode
connection
ZVS class D
SEPIC
Pre-regulator amplier
19 VDC
4 VDC –
80 VDC
Cs
Coil
X
Iamp Pamp
Vamp
Icoil
Combiner
Control reference signal
Icoil

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Demonstration System EPC9129
Figure 4: Schematic of AirFuel Class 4 source coil.
Figure 6: ON-OFF-KEY modulation.
Source coil
Coil connection
Tuning network
Class 3 coil
f = 6.78 MHz
ON-OFF KEY modulation
Figure 5: Schematic diagram of the EPC9513 and EPC9514 demo board.
Load
Device
coil
Un-Regulated
DC output
Tuning Network Rectier Regulator
Regulated
DC output
Coil connection
COUT
CRect
VOUT
CSeptic
Q1
Drect
Llower
LM11
LM1
CMx
CMPx
LE1 CMx
Lupper
Figure 7: Proper connection for the source coil.
Tuning
Amplier
Connection
EFFICIENT POWER CONVERSION

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Demonstration System EPC9129
Figure 9: Proper connection and measurement for the EPC9513 receiver board.
Switch node
Regulated
voltage
measurement
Measurement points
Regulator
Coil tuning
Coil connection Disable regulator
Un-regulated
load connection Regulated
load connection
mV
Rectier voltage
(0 V - 38 Vmax)
Rectier DC
current
(75 mΩ shunt)
Rectier voltage
>5 V LED
Rectier voltage
<36 V LED
V
V
Figure 8: Proper connection and measurement setup for the amplier board.
17-24 VDC
VIN supply
(note polarity)
Source coil connection
External oscillator
Switch-node main
oscilloscope probe
Switch-node secondary
oscilloscope probe
Ground post
Amplier voltage source jumper
Disable
oscillator
jumper
Single ended /
dierential mode
operation selector
Coil current setting
Amplier timing setting
(not installed)
Disable pre-regulator jumper
Internal oscillator selection jumper
+
Pre-regulator jumper
Bypass connection
OOK modulation
control input
Operating mode LED
indicators
Ground post
Ground post
Amplier supply voltage
(0 V –80 Vmax)
V
Switch-node
pre-regulator
oscilloscope probe
J1

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Demonstration System EPC9129
Figure 11: Measurement locations of switch node waveforms on EPC9512 amplier board.
Figure 12: ZVS timing diagrams.
Shoot-
through
Shoot-
through
Q2 turn-on
Q1 turn-o
VAMP
0time
ZVS
Partial
ZVS
ZVS + diode
conduction
Q1 turn-on
Q2 turn-o
VAMP
0time
ZVS
Partial
ZVS
ZVS + diode
conduction
Figure 10: AirFuel Category 5 device board.
Disable RegulatorCoil Connection
V
Rectier Voltage
(12.5 V – 48 Vmax)
V
mV
Regulated load
connection
Coil tuning
Rectier DC Current
(75 mΩ Shunt)
Rectier voltage
> 4 V LED
Rectier voltage
> 44 V LED
Un-Regulated
load connection
Regulated
voltage
measurement
Regulator
Switch-node
measurement points

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Demonstration System EPC9129
(continued on next page)
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Table 4: Bill of Materials - Amplier Board
Item Qty Reference Part Description Manufacturer Part #
1 3 C1a, C1b, C80 1 µF, 10 V TDK C1005X7S1A105M050BC
2 14 C2a, C2b, C4a, C4b, C5a, C5b, C70, C71, C72, C77,
C78, C81, C130, C220 100 nF, 16 V Würth 885012205037
3 3 C3a, C3b, C95 22 nF, 25 V Würth 885012205052
4 10 C6a, C6b, C7a, C7b, C31, C32, C44, C75, C76, C82 22 pF, 50 V Würth 885012005057
5 6 C11a, C11b, C12a, C12b, C13a, C13b 10 nF, 100 V TDK C1005X7S2A103K050BB
6 8 C14a, C14b, C15a, C15b, C16a, C16b, C17a, C17b 1 µF, 100 V TDK C2012X7S2A105K125AB
7 1 C21 (not populated) 680 pF, 50 V Murata
GRM155R71H681KA01D
8 1 C73 (not populated) 22pF, 50 V Würth 885012005057
9 2 C133, C223 (not populated) 1 nF, 50 V Murata GRM1555C1H102JA01D
10 1 C22 390 pF, 50 V Murata GRM1555C1H391GA01D
11 2 C30, C50 100 nF, 100 V Murata GRM188R72A104KA35D
12 2 C33, C53 10 nF, 50 V Murata GRM155R71H103KA88D
13 1 C51 0.82 µF, 10 V Murata GRM155R61A824KE15D
14 1 C52 100 pF Murata GRM1555C1H101JA01D
15 1 C54 22 nF, 50 V Murata GRM155R71H223KA12D
16 1 C55 1 µF, 25 V TDK C1005X5R1E105M050BC
17 3 C61, C62, C63 22 µF, 35 V TDK C3216JB1V226M160AC
18 2 C64, C65 4.7 µF, 100 V TDK CGA6M3X7S2A475M200AB
19 1 C67 (not populated) 10 nF, 100 V TDK C1608X7R2A103K080AA
20 3 C90, C91, C92 1 µF, 25 V Würth 885012206076
21 2 C131, C221 1 nF, 50 V Murata GRM1555C1H102JA01D
22 2 Czvs1, Czvs2 1 µF, 50 V Würth 885012207103
23 1 D1 25 V, 11 A Littelfuse SMAJ22A
24 3 D1a, D1b, D95 40 V, 300 mA ST BAT54KFILM
25 13 D2a, D2b, D3a, D3b, D21, D40, D41, D42, D71, D72,
D76, D77, D78 40 V, 30 mA Diodes Inc.
SDM03U40
26 2 D4a, D4b 5 V1, 150 mW Comchip Technology CD0603-Z3V9
27 1 D35 LED 0603 yellow Lite-On LTST-C193KSKT-5A
28 1 D36 LED 0603 green Lite-On LTST-C193KGKT-5A
29 1 D37 LED 0603 red Lite-On LTST-C193KRKT-5A
30 1 D47 40 V, 30 mA Diodes Inc. SDM03U40-7
31 1 D60 200 V, 3 A On Semiconductor NRVBS3200T3G
32 1 D67 (not populated) 200 V, 1 A Diodes Inc. DFLS1200
33 1 D90 40 V, 1 A Diodes Inc. PD3S140-7
34 1 D221 3 V9, 150 mW Bournes CD0603-Z3V9
35 3 GP1a, GP1b, GP60 .1" male vert. Würth 61300111121
36 1 J1 .156" male vert. Würth 645002114822
37 1 J2 SMA board edge Linx CONSMA003.062
38 7 J70, J75, J76, JP1, JP50, JP70, JP71 .1" male vert. Würth 61300211121
39 1 JMP1 DNP
40 2 JP10, JP72 Jumper 100 Würth 60900213421
41 1 L60 100 µH, 3 A CoilCraft MSD1514-104KE
42 1 L80 10H, 150 mA Taiyo Yuden LBR2012T100K
43 1 L90 47 µH, 250 mA Würth 7440329470
44 1 Lsns (not populated) 82 nH CoilCraft 1515SQ-82NJEB
45 2 Lzvs1, Lzvs2 500 nH CoilCraft 2929SQ-501JE
46 1 Lzvs12 (not populated) DNP CoilCraft
47 1 P25 (not populated) 10 kΩ Murata PV37Y103C01B00
48 4 P71, P72, P77, P78 (not populated) 1 kΩ Murata PV37Y102C01B00
49 4 Q1a, Q1b, Q2a, Q2b 100 V, 160 mΩ EPC EPC8010
50 2 Q3a, Q3b 100 V, 3300 mΩ EPC EPC2038