Demonstration System
EPC9509
Quick Start Guide
EPC2108 and EPC2036
6.78 MHz, ZVS Class-D Wireless Power Amplifier
QUICK START GUIDE
Demonstration System EPC9509
DESCRIPTION
The EPC9509 is a high efficiency, Zero Voltage Switching (ZVS), class-D
wireless power amplifier demonstration board that operates at 6.78 MHz
(Lowest ISM band). The purpose of this demonstration system is to simplify the evaluation process of wireless power amplifier technology using
eGaN® FETs by including all the critical components on a single board
that can be easily connected into an existing system.
The amplifier board features the enhancement-mode, half-bridge field
effect transistor (FET), the 60 V rated EPC2108 eGaN FET with integrated
synchronous bootstrap FET. The amplifier can be set to operate in either
differential 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 A4WP standard. This
allows for testing compliant to the A4WP class 3 standard over a load
range as high as ±50j Ω. The pre-regulator features the 100 V rated 65 mΩ
EPC2036 as the main switching device for a SEPIC converter.
For more information on the EPC2108 eGaN FETs 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.
Table 1: Performance Summary (TA = 25°C) EPC9509
Symbol
Parameter
Conditions
Min
Max
Units
VIN
Bus Input Voltage Range –
Pre-Regulator Mode
Also used in
bypass mode
for logic supply
17
24
V
VIN
Amp Input Voltage Range –
Bypass Mode
Switch-Node Output
Voltage
Switch-Node Output
Current (each)
External Oscillator Input
Threshold
0
52
V
52
V
1*
A
VOUT
IOUT
Vextosc
VPre_Disable
IPre_Disable
VOsc_Disable
IOsc_Disable
VsgnDiff
IsgnDiff
DETAILED DESCRIPTION
Pre-Regulator Disable
Voltage Range
Pre-Regulator Disable
Current
Oscillator Disable
Voltage Range
Oscillator Disable
Current
Differential or Single-Select
Voltage
Differential or Single-Select
Current
Input ‘Low’
-0.3
0.8
V
Input ‘High’
2.4
5
V
Floating
-0.3
5.5
V
Floating
-10
10
mA
Open Drain/
Collector
Open Drain/
Collector
Open Drain/
Collector
Open Drain/
Collector
-0.3
5
V
-25
25
mA
-0.3
5.5
V
-1
1
mA
* Maximum current depends on die temperature – actual maximum current will be subject to switching
frequency, bus voltage and thermals.
The Amplifier Board (EPC9509)
Figure 1 shows the system block diagram of the EPC9509 ZVS class-D
amplifier with pre-regulator and figure 2 shows the details of the ZVS
class-D amplifier section. The pre-regulator is used to control the ZVS
class-D wireless power amplifier based on three feedback parameters
1) the magnitude of the coil current indicated by the green LED, 2) the
DC power drawn by the amplifier indicated by the yellow LED and 3)
a maximum supply voltage to the amplifier 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
amplifier followed by the power delivered to the amplifier and lastly the
magnitude of the coil current. The maximum amplifier supply voltage
is pre-set to 52 V and the maximum power drawn by the amplifier is
pre-set to 16 W. The coil current magnitude is pre-set to 800 mARMS but
can be made adjustable using P25. The pre-regulator comprises a SEPIC
converter that can operate at full power from 17 V through 24 V.
The pre-regulator can be bypassed by connecting the positive supply
directly to the ZVS class-D amplifier supply after removing jumper JP1 at
location JP1 and connecting the main positive supply to the bottom pin.
JP1 can also be removed and replaced with a DC ammeter to directly
measure the current drawn by the amplifier. 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 amplifier supply, an accurate measurement of the
power drawn by the amplifier can be made. The EPC9509 is also provided
with a miniature high efficiency switch-mode 5 V supply to power the logic
circuits on board such as the gate drivers and oscillator.
2 |
EPC9509 amplifier board photo
The amplifier 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 is the ground connection)
and the jumper (JP71) is removed.
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Demonstration System EPC9509
The pre-regulator can also be disabled in a similar manner as the oscillator
using JP50. However, note that this connection is floating with respect to the
ground so removing the jumper for external connection requires a floating
switch to correctly control this function. Refer to the datasheet of the controller IC and the schematic in this QSG for specific details.
2. With power off, connect the control input power supply bus (19 V) to (+)
connector (J1). Note the polarity of the supply connector.
The ZVS timing adjust circuits for the ZVS class D amplifiers are each
independently settable to ensure highest possible efficiency setting and
includes separate ZVS tank circuits. This allows OOK modulation capability
for the amplifier.
4. Turn on the control supply – make sure the supply is approximately 19 V.
The EPC9509 is provided with 3 LED’s that indicate the mode of operation
of the system. 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 A4WP compliant as the load impedance is too high for the amplifier 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 A4WP standard and by measuring the amplifier supply voltage across TP1 and TP2 will show that it has nearly reach
the maximum value limit.
Single ended or Differential Mode operation
The EPC9509 amplifier can be operated in one of two modes; singleended or differential mode. Single ended operation offers higher amplifier
efficiency but reduced imaginary impedance drive capability. If the
reflected impedance of the tuned coil load exceeds the capability of
the amplifier to deliver the desired power, then the amplifier can be
switched over to differential mode. In differential mode, the amplifier is
capable of driving an impedance range of 1 Ω through 56 Ω and ±50j Ω and
maintains either the 800 mARMS coil current or deliver up to 16 W of power.
The EPC9509 is set by default to differential mode and can be switched to
single ended mode by inserting a jumper into J75. When inserted the amplifier operates in the single-ended mode. Using an external pull down with
floating collector/ drain connection will have the same effect. The external
transistor must be capable of sinking 25 mA and withstand at least 6 V.
For differential 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 efficiency with the EPC9509 amplifier. 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 fixed resistor values. The procedure is the same for both
single-ended and differential mode of operation. The timing MUST
initially be set WITHOUT the source coil connected to the amplifier.
The timing diagrams are given in Figure 5 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 off, remove the jumper in JP1 and install it into JP50 to place
the EPC9509 amplifier into Bypass mode. Connect the main input power
supply (+) to JP1 (bottom pin – for bypass mode) with ground connected
to J1 ground (-) connection.
3. Connect a LOW capacitance oscilloscope probe to the probe-hole of
the half-bridge to be set and lean against the ground post as shown in
Figure 4.
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 52 V).
6. While observing the oscilloscope adjust the applicable potentiometers to
so achieve the green waveform of figure 5.
7. Repeat for the other half-bridge.
8. Replace the potentiometers with fixed value resistors if required. Remove
the jumper from JP50 and install it back into JP1 to revert the EPC9509
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 off. The capacitors CZVS1 and CZVS2 are chosen to have a
very small ripple voltage component and are typically around 1 µF. The
amplifier supply voltage, switch-node transition time will determine the
value of inductance for LZVSx which needs to be sufficient 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:
LZVS =
∆tvt
8 ∙ fsw∙ (COSSQ + Cwell)
(1)
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
that the amplifier supply voltage VAMP is absent from the equation as
it is accounted for by the voltage transition time. The COSS of the EPC2108
eGaN FETs is very low and lower than the gate driver well capacitance Cwell
which as a result must now be included in the ZVS timing calculation.
The charge equivalent capacitance can be determined using the following
equation:
NOTE.
COSSQ =
1
VAMP
∙
∫
VAMP
0
COSS (v) ∙ dv
(2)
To add additional immunity margin for shifts in coil impedance, the
value of LZVS can be decreased to increase the current at turn off
of the devices (which will increase device losses). Typical voltage
transition times range from 2ns through 12ns. For the
differential case the voltage and charge (COSSQ) are doubled when
calculating the ZVS inductance.
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| 3
QUICK START GUIDE
Demonstration System EPC9509
QUICK START PROCEDURE
The EPC9509 amplifier board is easy to set up and evaluate the
performance of the eGaN FET in a wireless power transfer application.
The EPC9509 can be operated using any one of two alternative methods:
a. Using the pre-regulator
3. With power off, 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.
a. Operation using the pre-regulator
6. Turn on the main supply voltage to the required value (it is
recommended to start at 0 V and do not exceed the absolute maximum
voltage of 52 V).
The pre-regulator is used to supply power to the amplifier in this
mode and will limit the coil current, power delivered or maximum
supply voltage to the amplifier based on the pre-determined settings.
7. Once operation has been confirmed, adjust the main supply voltage
within the operating range and observe the output voltage, efficiency
and other parameters on both the amplifier and device boards.
The main 19 V supply must be capable of delivering 2 ADC. DO NOT
turn up the voltage of this supply when instructed to power up the
board, instead simply turn on the supply. The EPC9509 board includes a
pre-regulator to ensure proper operation of the board including start up.
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.
b. Bypassing the pre-regulator
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 off, connect the main input power supply bus to J1 as
shown in figure 3. 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).
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 Figure 4).
2. To maintain control stability, the red LED for voltage mode indicator on the EPC9509
version 1.0 has been disabled. This will be corrected in subsequent revisions of the
board. For questions regarding this LED function, please contact EPC.
3. AVOID using a Lab Benchtop programmable DC as the load for the device board. These
loads have low control bandwidth and will cause the EPC9509 system to oscillate at a
low frequency and may lead to failure. It is recommended to use a fixed low inductance
resistor as an initial load. Once a design matures, a post regulator, such as a Buck
converter, can be used.
5. Once operation has been confirmed, observe the output voltage,
efficiency and other parameters on both the amplifier and device
boards.
6. For shutdown, please follow steps in the reverse order.
SEPIC
pre-regulator
b. Operation bypassing the pre-regulator
In this mode, the pre-regulator is bypassed and the main power is
connected directly to the amplifier. This allows the amplifier to be
operated using an external regulator. In this mode there is no protection
for ensuring the correct operating conditions for the eGaN FETs.
ZVS class D
amplifier
4 V DC –
52 VDC
19 VDC
Coil
|Icoil |
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 amplifier 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 place the
EPC9509 in bypass mode. Also make sure the source coil and device
coil with load are connected.
2. With power off, connect the main input power supply bus +VIN to the
bottom pin of JP1 and the ground to the ground connection of J1 as
shown in figure 3.
4 |
CS
Icoil
VAMP
I AMP
X
Combiner
PAMP
Control reference signal
Figure 1: Block diagram of the EPC9509 wireless power amplifier
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QUICK START GUIDE
Demonstration System EPC9509
Bypass mode
connection
Pre-regulator
jumper
JP1
VAMP
Coil
connection
Preregulator
L ZVS12
Q 1_a
V IN
+
Q 1_b
Single
ended
operation
jumper
L ZVS2
J1
Q 2_a
L ZVS1
C ZVS1
Q 2_b
C ZVS2
Figure 2: Diagram of EPC9509 amplifier circuit
9-24 VDC
VIN supply
(note polarity)
Amplifier voltage
source jumper
bypass connection
Pre-regulator jumper
Operating mode LED
indicators
+
Coil current setting
Switch-node main
oscilloscope probe
Switch-node
pre-regulator
oscilloscope probe
Ground post
Ground post
Source coil
connection
Amplifier timing
setting (not installed)
Disable pre-regulator
jumper
OOK modulation input
V
Single ended/ differential
mode operation selector
Internal oscillator
selection jumper
Disable
oscillator
jumper
Ground post
External
oscillator
Amplifier
supply voltage
(0 V – 52 Vmax )
Switch-node secondary
oscilloscope probe
Amplifier board – front-side
Figure 3: Proper connection and measurement setup for the amplifier board
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QUICK START GUIDE
Demonstration System EPC9509
Switch-node
measurement
points
Figure 4: Proper measurement of the switch nodes using the hole and ground post
Q1 turn-off
VAMP
Q2 turn-off
VAMP
Q2 turn-on
0
Shootthrough
Partial
ZVS
Q1 turn-on
0
time
Shootthrough
ZVS
Partial
ZVS
ZVS + diode
conduction
time
ZVS
ZVS + diode
conduction
Figure 5: ZVS timing diagrams
6 |
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QUICK START GUIDE
Demonstration System EPC9509
THERMAL CONSIDERATIONS
The EPC9509 demonstration system showcases the EPC2108 and
EPC2036 eGaN FETs 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 EPC9509 demonstration system has limited current protection only when
operating off the Pre-Regulator. When bypassing the pre-regulator there is no current
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 EPC9509 demonstration system has a limited controller and no
enhanced protection systems and therefore should be operated with
caution. Some specific precautions are:
1. Please contact EPC at info@epc-co.com should the tuning of the coil be
required to change to suit specific conditions so that it can be correctly
adjusted for use with the ZVS class-D amplifier.
2. There is no heat-sink on the devices and during experimental
evaluation it is possible present conditions to the amplifier 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 EPC9509 amplifier board into your VNA in an
attempt to measure the output impedance of the amplifier. Doing so
will severely damage the VNA.
Table 2: Bill of Materials - Amplifier Board
Item
Qty
1
3
2
12
3
4
5
6
7
3
2
1
1
1
8
8
9
10
11
12
13
14
15
16
17
18
19
20
21
4
4
1
1
2
1
1
2
2
1
3
2
3
22
10
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
3
2
1
1
1
1
1
3
1
1
6
1
1
1
1
1
2
Reference
Part Description
Manufacturer
Part #
C1_a, C1_b, C80
C2_a, C2_b, C4_a, C4_b, C35, C51,
C70, C71, C72, C77, C78, C81
C3_a, C3_b, C95
C5_a, C5_b
C20
C73
R20
C6_a, C6_b, C7_a, C7_b, C31, C44,
C75, C82
C11_a, C11_b, C12_a, C12_b
C15_a, C15_b, C64, C65
C21
C22
C30, C50
C32
C52
C53, CR43 (on top of R43)
C61, C62
C63
C90, C91, C92
Czvs1, Czvs2
D1_a, D1_b, D95
D2_a, D2_b, D21, D40, D41, D42,
D71, D72, D77, D78
D3_a, D3_b, D20
D4_a, D4_b
D35
D36
D37
D60
D90
GP1_a, GP1_b, GP60
J1
J2
J70, J75, JP1, JP50, JP70, JP71
JMP1
L60
L80
L90
Lsns
Lzvs1, Lzvs2 see addendum statement
1 µF, 10 V
TDK
C1005X7S1A105M050BC
100 nF, 16 V
Würth
885012205037
22 nF, 25 V
DNP (100 nF, 16 V)
DNP (1 nF, 50 V)
DNP (22 pF, 50 V)
DNP (10k)
Würth
Würth
Murata
Würth
Panasonic
885012205052
885012205037
GRM155R71H102KA01D
885012005057
ERJ-2GEJ103X
22 pF, 50 V
Würth
885012005057
10 nF, 100 V
2.2 µF, 100 V
680 pF, 50 V
1 nF, 50 V
100 nF, 100 V
1 nF, 50 V
100 pF
10 nF, 50 V
4.7 µF, 50 V
10 µF, 35 V
1 µF, 25 V
1 µF, 50 V
40 V, 300 mA
TDK
Taiyo Yuden
Murata
Murata
Murata
Murata
Murata
Murata
Taiyo Yuden
Taiyo Yuden
Würth
Würth
ST
C1005X7S2A103K050BB
HMK325B7225KN-T
GRM155R71H681KA01D
GRM155R71H102KA01D
GRM188R72A104KA35D
GRM1555C1H102JA01D
GRM1555C1H101JA01D
GRM155R71H103KA88D
UMK325BJ475MM-T
GMK325BJ106KN-T
885012206076
885012207103
BAT54KFILM
40 V, 30 mA
Diodes Inc.
SDM03U40
40 V, 30 mA
5V1, 150 mW
LED 0603 Yellow
LED 0603 Green
LED 0603 Red
100 V, 1 A
40 V, 1 A
.1" Male Vert.
.156" Male Vert.
SMA Board Edge
.1" Male Vert.
DNP
33 µH, 2.8 A
10 µH,150 mA
47 µH, 250mA
110 nH
390 nH
Diodes Inc.
Bournes
Lite-On
Lite-On
Lite-On
On-Semi
Diodes Inc.
Würth
Würth
Linx
Würth
SDM03U40
CD0603-Z5V1
LTST-C193KSKT-5A
LTST-C193KGKT-5A
LTST-C193KRKT-5A
MBRS1100T3G
PD3S140-7
61300111121
645002114822
CONSAM003.062
61300211121
CoilCraft
Taiyo Yuden
Würth
CoilCraft
CoilCraft
MSD1278-334
LBR2012T100K
7440329470
2222SQ-111JE
2929SQ-391JE
(continued on next page)
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| 7
QUICK START GUIDE
Demonstration System EPC9509
Table 2: Bill of Materials - Amplifier Board (continued)
Item
Qty
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
1
5
2
1
1
3
2
2
1
1
1
1
1
1
1
2
2
1
2
1
1
1
1
2
1
1
1
1
1
1
1
2
2
2
1
1
2
1
2
1
1
1
1
2
2
1
1
Reference
Lzvs12
P25, P71, P72, P77, P78
Q1_a, Q1_b
Q60
Q61
R2_a, R2_b, R82
R3_a, R3_b
R4_a, R4_b
R20
R21
R25
R26
R30
R31
R32
R33, R70
R35, R36
R37
R38, R91
R40
R41
R42
R43
R44, R90
R50
R51
R52
R53
R54
R60
R61
R71, R78
R72, R77
R73, R75
R80
R92
TP1, TP2
Tsns
U1_a, U1_b
U30
U35
U50
U70
U71, U77
U72, U78
U80
U90
Part Description
Manufacturer
Part #
DNP
10 k, DNP (1 k)
60 V, 150 mΩ with SB
100 V, 65 mΩ
DNP (100 V, 6 A, 30 mΩ)
20 Ω
27 k
4.7 Ω
DNP (10 k)
100 k
7.5 k
2k
100 Ω
51.0 k 1%
8.2 k 1%
47 k
634 Ω
150 k 1%
49.9 k 1%
196 k
6.04 k
24.9 k
10.5 k
100 k 1%
10 Ω
124 k 1%
71.5 k 1%
1.00 k
0Ω
40 mΩ, 0.4 W
150 mΩ, 0.25 W
124 Ω
22 Ω
10 k
2.2 Ω
9.53 k 1%
SMD Probe Loop
10 µH, 1:1, 96.9%
100 V eGaN Driver
Power & Current Monitor
DNP (Comparator)
Boost Controller
Programmable Oscillator
2 In NAND
2 In AND
Gate Driver with LDO
1.4 MHz, 24 V, 0.5A Buck
CoilCraft
Bournes, Murata
EPC
EPC
EPC
Stackpole
Panasonic
Panasonic
Panasonic
Panasonic
Panasonic
Panasonic
Panasonic
Panasonic
Panasonic
Panasonic
Panasonic
Panasonic
Panasonic
Panasonic
Panasonic
Panasonic
Panasonic
Panasonic
Panasonic
Panasonic
Panasonic
Panasonic
Yageo
Vishay Dale
Vishay Dale
Panasonic
Panasonic
Panasonic
Yageo
Panasonic
Keystone
CoilCraft
National Semiconductor
Linear
Texas Instruments
Texas Instruments
KDS Daishinku America
Fairchild
Fairchild
Texas Instruments
MPS
TBD
3266Y-1-103LF, PV37Y102C01B00
EPC2108
EPC2036
EPC2007C
RMCF0402JT20R0
ERJ-2GEJ273X
ERJ-2GEJ4R7X
ERJ-2GEJ103X
ERJ-2GEJ104X
ERJ-2RKF7501X
ERJ-2RKF2001X
ERJ-3EKF1000V
ERJ-3EKF5102V
ERJ-2RKF8201X
ERJ-2RKF4702X
ERJ-2RKF6340X
ERJ-2RKF1503X
ERJ-2RKF4992X
ERJ-3EKF1963V
ERJ-2RKF6041X
ERJ-2RKF2492X
ERJ-2RKF1052X
ERJ-2RKF1003X
ERJ-3EKF10R0V
ERJ-2RKF1243X
ERJ-2RKF7152X
ERJ-2RKF1001X
RC0402JR-070RL
WSLP0603R0400FEB
WSL0805R1500FEA18
ERJ-2RKF1240X
ERJ-2RKF22R0X
ERJ-2GEJ103X
RC0402JR-072R2L
ERJ-2RKF9531X
5015
PFD3215-103ME
LM5113TM
LT2940IMS#PBF
TLV3201AIDBVR
LM3478MAX/NOPB
DSO221SHF 6.780
NC7SZ00L6X
NC7SZ08L6X
UCC27611DRV
MP2357DJ-LF
EPC would like to acknowledge Würth Electronics (www.we-online.com/web/en/wuerth_elektronik/start.php), Coilcraft (www.coilcraft.com), and KDS Daishinku America (www.kdsamerica.com) for their support of this project.
Addendum Statement; Ongoing testing of the EPC9509 revealed that the improvement in performance of the EPC2108 based design exceeded that of earlier design criteria and as such the design could further be improved to
increase efficiency by changing Lzvs1 and Lzvs2 from 390nH (Coilcraft 2929SQ-391JEB) to 500nH (Coilcraft 2929SQ-501JEB).
8 |
| EPC – EFFICIENT POWER CONVERSION CORPORATION | WWW.EPC-CO.COM | COPYRIGHT 2017
QUICK START GUIDE
2
C91
1uF, 25 V
D90
40 V, 1 A
PD3S140-7
A
OSC
C92
1uF, 25 V
1
Y
B
R72
2
L_S ig1
1
2
OSC
1
IntOsc
2
1
a
EPC9509_SE_ZVSclassD_Rev2_0.SchDoc
Vamp
5V
VAMP
5V
D72
40 V, 30 mA
SDM03U40
H_Sig1
Jumper 100
OSC
Hin
OUT
OSC
1
2
Internal / External Oscillator
L_Sig1
Lin
.1" Male Vert.
P77
3
nSD
IntOsc
4
EMPTY
1
R7 7
L_S ig2
b
EPC9509_SE_ZVSclassD_Rev2_0.SchDoc
5V
D77
40 V, 30 mA
SDM03U40
OOKM
H_Sig2
Single / Differential Mode
OSC
OOKM
1
2
.1" Male Vert.
C76
22 pF, 50 V
P78
U78
NC7SZ08L6X
1
2
1
2
nSD
C75
22 pF, 50 V
J75
R76
10 k
J76
1
2
.1" Male Vert.
OOK Modulation
A
nSD
B
Hin
OUT
Y
EMPTY
L_Sig2
1k
1
R78
Vamp
Lzvs2
390 nH
Czvs2
1μF, 50 V
OutB
JMP 1
DNP
Lin
Single Ended Operation Only
2
H_Sig2
124 Ω
5V
C78
100 nF, 16 V
D78
40 V, 30 mA
SDM03U40
Figure 6: EPC9509 - ZVS class-D amplifier schematic
Addendum Statement; Ongoing testing of the EPC9509 revealed that the
improvement in performance of the EPC2108 based design exceeded that
of earlier design criteria and as such the design could further be improved
to increase efficiency by changing Lzvs1 and Lzvs2 from 390nH (Coilcraft
2929SQ-391JEB) to 500nH (Coilcraft 2929SQ-501JEB).
Demonstration System EPC9509
R75
10 k
VAMP
5V
Deadtime B Rise
5V
SDM03U40
40 V, 30 mA
Lzvs12
TBD
EMPTY
ZVS Tank Circuit
1
2
22 Ω
C77
100nF, 16 V
Czvs1
1 μF, 50 V
SMD probeloop
D76
nSD
5V
J2
SMA Board Edge
Lsns
82 nH
EMPTY
Lzvs1
390 nH
TP 2
1k
B
Oscillator
5V
Tsns1
EMPTY
10 μH 1:1 96.9%
OutA
SMD probeloop
5V
C70
100 nF, 16 V
Oscillator Disable
U77
NC7SZ00L6X
A
OSC
5V
2
.1" Male Vert.
U70
DSO221SHF 6.780
VCC
OE
OUT
GND
R2 1
51 Ω 1/2 W
Icoil
R2 6
6.81 k, 1%
GND
1
2
1
Tsns2
CST7030-020LB
1:20 Current Xrmr
Vamp
1
Deadtime B Fall
5V
1
2
JP70
P25
10 k
EMPTY
External Oscillator
5V
R7 0
47 k
2
R2 5
4.3 k, 1%
C22
1 nF, 50 V
Current Set/Adjust
J70
TP 1
5V
1
2
Coil Current Sense
C72
100 nF, 16 V
C73
22 pF, 50 V
EMPTY
1
Pre-Regulator
22 Ω
JP71
JP72
.1" Male Vert.
R7 3
10 k
EMPTY
PreRegulator
EPC9509PR_R2_0.SchDoc
5V
Logic Supply Regulator
OSC
C21
680 pF, 50 V
Vout
1 2
1k
Vout
2
OOKM
L90
47 μH, 250 mA
GND
R92
9.53 k, 1%
U72
NC7SZ08L6X
5V
GND
3
6
Icoil
2
FB
DRV
D21
SDM03U40
40 V, 30 mA
Vin
6
CNTL
Icoil
EMPTY
Vin
1
0.81V
C95
22 nF, 25 V
P72
5V
Vamp
Pre-Regulator Disconnect
Reverse Polarity Protection
4
Reg
1
3
EN
5V
Deadtime A Fall
5V
BAT54KFILM
1
Vout
Main Supply
19 V, 1.5 Amax
D71
40 V, 30 mA
SDM03U40
JP1
.1" Male Vert.
D1
25V, 11A
SMAJ22A
3
1
2
R91
49.9 k, 1%
4
Vin
Jumper 100
4
C71
100nF, 16 V
Vin
H_Sig1
5V
D95
IN
OSC
2
124 Ω
2
5V
1
2
R7 1
1
5
1
U90
MP2357DJ-LF
J1
.156" Male Vert.
1k
B
C90
1 μF, 25 V
R9 0
100 k, 1%
EMPTY
G ND
Vin
U71
NC7SZ00L6X
A
OSC
Vin
P71
1
OOKM
2
EPC – EFFICIENT POWER CONVERSION CORPORATION | WWW.EPC-CO.COM | COPYRIGHT 2017 |
JP10
Deadtime A Rise
5V
| 9
5V
5V
1
C2
100 nF, 16 V
R4
4.7 Ω
2
5 VHS
C4
100 nF, 16 V
Gbtst
QUICK START GUIDE
10 |
Q1B
EPC2108
D4
CD0603-Z5V1
OUT
D3
SDM03U40
Synchronous Bootstrap Power Supply
1
4.7 V
C3
22 nF, 25 V
R3
27k
2
C5
100 nF, 16 V
1
VAMP
VAMP
C11
10 nF, 100 V
D2
SDM03U40
C12
10 nF, 100 V
GL
VAMP
C15
2.2 µF, 100 V
5VHS
VAMP
GU
GU
HIN
HIN
OUT
4.7 V
C6
22 pF, 50 V
LIN
GL
GL
LIN
C7
22 pF, 50 V
U1
LM5113TM
Q1A
EPC2108
60 V, 150 mΩ with SB
GU
D1
BAT54KFILM
5V
PH1
OUT
1
OUT
ProbeHole
GL
C1
1 µF, 10 V
Gate Driver
GP1
1
GND
.1" Male Vert.
Ground Post
Figure 7: EPC9509 - Gate driver and power devices schematic
This schematic is repeated for each single-ended ZVS class D amplifier.
GND
Demonstration System EPC9509
| EPC – EFFICIENT POWER CONVERSION CORPORATION | WWW.EPC-CO.COM | COPYRIGHT 2017
2
R2
20 Ω
VAMP
QUICK START GUIDE
1
R5 1
124 k 1%
R5 3
4.7 k
D40
Vom
C52
100 pF
Vfd bk
C51
22nF, 25 V
Isns
1
Comp
R5 4
0 Ω
U50
LM3478 MAX/NOPB
FB
DR
Cnt
2
1
6
1 R8 2
20 Ω
PreDR
Isens
5 VGD
C81
100 nF, 16 V
Isns
1
Isns
2
PW M
VDD
VREF
LDO
3
U80
UCC27611DRV
C82
22 pF, 50 V
Isns
VSS
6
5 VGD
5
4
GLPH
GLPL
EP Isns
GLPH 1
Gate Driver
R8 0
2.2 Ω
SW
GLPL
1
VCC
R31
45.3 k, 1%
Output Current Limit
D42
2
Vfd bk
V+
Vout
8
V+
Vout
Vout
I+
R6 0
40 mΩ, 0.4 W
C65
2.2 μF, 100 V
IImon
U30
LT2940IMS#PBF
5
1 R33
47 k
Imon
Q61
EPC2007C
100 V, 6 A, 30 mΩ
EMPTY
GP60
.1" Male Vert.
2
2
1
1
Ground Post
2
GND
1
Icoil
R6 1
11
12
Vsepic
Vout
1
150 mΩ, 0.25 W
1
Vsepic
1 R3 0
2
100 Ω
C30
100 nF, 100 V
C64
2.2 μF, 100 V
Q60
EPC2036
100 V, 65 mΩ
2 GLPL
Isns
10
SDM03U40
R43 40 V, 30 mA
10.5 k
PH60
ProbeHole
D41
1
1 R4 2
2
23.2 k
Vsepic
C63
2.2 μF, 100 V
Vin
Output Power Limit
Pmon
D60
MBRS1100T3G
100 V, 1 A
L60
33 µH, 2.8 A
5
C53
10 nF, 50 V
5 VGD
2
Pgnd
4
Agnd
5 VGD
C80
1 μF, 10 V
Isns
2
1
SDM03U40
R41 40 V, 30 mA
6.04 k
3
5V
UVLO
1.26 V
1
2
Osc
C62
4.7 μF, 50 V
2
2
FA/SD
Vin
1
7
2
Output Voltage Limit
1 R4 0
196 k
C50
100 nF, 100 V
L80
10 μH, 150 mA
4
FA/SD
Comp
Vout
Vin
C61
4.7 μF, 50 V
2
8
R5 2
71.5 k 1%
1 R5 0
10 Ω
3
1
Vin
PreRegulator Disable
R4 8
15.4 k
Vin
Vin
1
2
SDM03U40-7
40 V, 30 mA
2
2
JP50
.1" Male Vert.
2
D47
1 R4 9
2
6.04 k
1
UVLO
2
Pcmp
7
V-
3
CMP+
Pmon
CMPout
2
C32
22 pF, 50 V
1.24 V
2
5V
5V
5
R132
18 k, 1%
3
2
R130
196 k
1
4
U130
TLV3201AIDBVR
2
1 R134
470 k
1
C223
1 nF, 50 V
EMPTY
C131
1 nF, 50 V
R133
6.8 k, 1%
2
2
R223
6.8 k, 1%
2
2
1
1
1 R224
330 k
5V
C130
100 nF, 16 V
5V
1
DC Power Monitor
R131
6.04 k
CD0603-Z3V9
Pcmp
R3 8
49.9 k, 1%
Voltage Mode
2
1
C221
1nF, 50 V
2
D221
R2 21
5.76 k
UVLO
U220
TLV3201AIDBVR
1 R3 6
2 5V
634 Ω
D36
1
2
5
1
4
1 R3 5
2
634 Ω
Iled
Current Mode
Vout
3
2
R2 20
71.5 k
D37
Figure 8: EPC9509 - Pre-regulator schematic
C133
1 nF, 50 V
EMPTY
2
Demonstration System EPC9509
1
Vin
CMPout 2
2
1
C220
100 nF, 16 V
5V
R2 22
18 k, 1%
Latch
R37
150 k, 1%
Power Mode
GND
5V
D35
Pled
Q
Lo
Hi
6
5V
1
Pmon
CLR LE
UVLC
9
5V
D
4
1
R32
C31
8.2 k, 1% 22pF, 50 V
2
C44
22 pF, 50 V
1
1
SDM03U40
40 V, 30 mA R44
100 k, 1%
2
EPC – EFFICIENT POWER CONVERSION CORPORATION | WWW.EPC-CO.COM | COPYRIGHT 2017 |
5V
UVLO Limit
| 11
For More Information:
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EPC Products are distributed through Digi-Key.
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Demonstration Board Notification
The EPC9509 board is intended for product evaluation purposes only and is not intended for commercial use. As an evaluation tool, it is not designed for compliance with the European
Union directive on electromagnetic compatibility or any other such directives or regulations. As board builds are at times subject to product availability, it is possible that boards may contain
components or assembly materials that are not RoHS compliant. Efficient Power Conversion Corporation (EPC) makes no guarantee that the purchased board is 100% RoHS compliant. No
Licenses are implied or granted under any patent right or other intellectual property whatsoever. EPC assumes no liability for applications assistance, customer product design, software
performance, or infringement of patents or any other intellectual property rights of any kind.
EPC reserves the right at any time, without notice, to change said circuitry and specifications.
