EPC EPC9508 User manual

Demonstration
System EPC9508
Quick Start Guide
Amplier Board for 6.78 MHz, ZVS
Class-D Wireless System using EPC8009/EPC2007

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Demonstration System EPC9508
DESCRIPTION
The EPC9508 is a high eciency, Zero Voltage Switching (ZVS), Class-D
wireless power amplier demonstration board 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 by including all the critical components on a single board
that can be easily connected into an existing system.
The EPC9508 amplier board features the EPC8009 and EPC2007
enhancement mode eld eect transistor (FET) in an optional half-
bridge topology (single ended conguration) or default full-bridge
topology (dierential conguration), and includes the gate driver/s
and oscillator that ensures operation of the system at 6.78 MHz.
The amplier board can also be operated using an external oscillator.
EPC9508 Amplier Board Photo
Table 1: Performance Summary (TA= 25°C) EPC9508
Symbol Parameter Conditions Min Max Units
VDD
Control Supply
Input Range 7 12 V
VIN
Bus Input Voltage Range –
Pre-Regulator mode 8 32 V
VIN
Bus Input Voltage Range –
Bypass mode 0 32 V
VOUT
Switch Node
Output Voltage VIN V
IOUT
Switch Node Output Current
(each) 10* A
Vextosc
External Oscillator
Input Threshold Input ‘Low’ -0.3 0.8 V
Input ‘High’ 2.4 5 V
VPre_Disable
Pre-regulator Disable
Voltage Range
Open Drain/
Collector -0.3 5.5 V
IPre_Disable Pre-regulator Disable Current Open Drain/
Collector -1 1 mA
VOsc_Disable
Oscillator Disable
Voltage Range
Open Drain/
Collector -0.3 5 V
IOsc_Disable
Oscillator Disable
Current
Open Drain/
Collector -25 25 mA
* Assumes inductive load, maximum current depends on die temperature – actual maximum current
with be subject to switching frequency, bus voltage and thermals.
The amplier board is equipped with a pre-regulator that limits the
current of the supply to the amplier. As the amplier draws more
current, which can be due to the absence of a device coil, the preregu-
lator will reduce the voltage being supplied to the amplier that will
ensure a safe operating point. The pre-regulator also monitors the
temperature of the main amplier FETs and will reduce current if the
temperature exceeds 85°C. The pre-regulator can be bypassed to allow
testing with custom control hardware. The board further allows easy
access to critical measurement nodes that allow accurate power mea-
surement instrumentation hookup. A simplied diagram of the ampli-
er board is given in Figure 1.
For more information on the EPC8009 & EPC2007 eGaN FET 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.

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Demonstration System EPC9508
DETAILED DESCRIPTION
The Amplier Board (EPC9508)
Figure 1 shows a diagram of the EPC9508 ZVS class-D amplier with pre-
regulator. The pre-regulator is set to a specied current limit (up to 1.5 A)
by adjusting P49 and operates from 6 V through 36 V input. The output
voltage of the pre-regulator is limited to approximately 2 V below the in-
put voltage. The pre-regulator can be bypassed by moving the jumper
(JP60) over from the right 2 pins to the left 2 pins. To measure the current
the amplier is drawing, an ammeter can be inserted in place of the jumper
(JP60) in the location based on the operating mode (pre-regulator or bypass).
The amplier comes with its own oscillator that is pre-programmed to
6.78 MHz ± 678 Hz. It can be disabled by placing a jumper into J70 or can
be externally shutdown using an externally controlled open collector / drain
transistor on the terminals of J70 (note which is the ground connection).
The switch needs to be capable of sinking at least 25 mA. An external os-
cillator can be used instead of the internal oscillator when connected to
J71 (note which is the ground connection) and the jumper (JP70) is moved
from the right 2 pins to the left 2 pins.
The pre-regulator can also be disabled in the same manner as the oscilla-
tor using J51. The pre-regulator can be bypassed, to increase the operating
voltage (with no current or thermal protection) to the amplier or to use
an external regulator, by moving the jumper JP60 from the right 2 pins to
the left 2 pins. Jumper JP60 can also be used to connect an ammeter to
measure the current drawn by the amplier (make sure the ammeter
connects to the pins that correspond to the mode of operation either
bypass or pre-regulator).
Single Ended Operation
The amplier can be congured for single ended operation where only
devices Q1 and Q2 are used. In this mode only LZVS1 and CZVS are used to
establish ZVS operation. If Q11 and Q12 are populated, then the following
changes need to be made to the board:
1) Remove R76 and R77
2) Short out C46 and C47
3) Short the connection of JMP1 (back side of the board)
4) Remove LZVS11
5) Check that CZVS1 is populated, if not then install.
6) R74 and R75 may need to be adjusted for the new operating
condition to achieve maximum eciency (see section on ZVS timing
adjustment).
ZVS Timing Adjustment
Setting the correct time to establish ZVS transitions is critical to achiev-
ing high eciency with the EPC9508 amplier. This can be done by
selecting the values for R74 and R75 respectively. This procedure is best
performed using potentiometer P74 and P75 installed 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 initial
be set WITHOUT the source coil connected to the amplier. The timing
diagrams are given in Figure 4 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, connect the main input power supply bus to +VIN
(J50). Note the polarity of the supply connector.
2. With power o, connect the control input power supply bus to +VDD
(J90). Note the polarity of the supply connector.
3. Connect a LOW capacitance oscilloscope probe to the probe-hole J2
and lean against the ground post as shown in Figure 3.
4. Turn on the control supply – make sure the supply is between 7 V
and 12 V range (7.5 V is recommended).
5. Turn on the main supply voltage to the required predominant oper-
ating value (such as 24 V but NEVER exceed the absolute maximum
voltage of 36 V).
6. While observing the oscilloscope adjust P74 for the rising edge
of the waveform so achieve the green waveform of gure 4.
Repeat for the falling edge of the waveform by adjusting P75.
7. Check that the setting remains optimal with a source coil attached.
In this case it is important that the source coil is TUNED to resonance
WITH an applicable load. Theoretically the settings should remain
unchanged. Adjust if necessary.
8. Replace the potentiometers with xed value resistors.
Dierential Operation
The amplier can be congured for dierential operation where all the
devices are used; Q1, Q2, Q11 and Q12. In this mode either LZVS1, LZ V S11 and
CZVS or LZVS12 only is used to establish ZVS operation.
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 capacitance CZVS is chosen to have a very small
ripple voltage component and is 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 opera-
tion over the DC device load resistance range and coupling between the
device and source coil range and can be calculated using the following
equation:
(1)
Where:
Δtvt = Voltage transition time [s]
fsw = Operating frequency [Hz]
COSSQ = Charge equivalent device output capacitance [F].
Note that the amplier supply voltage VAMP is absent from the
equation as it is accounted for by the voltage transition time.
The charge equivalent capacitance 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 12 ns. For the dierential case
the voltage and charge (COSSQ) are doubled.
LZVS = ∆tvt
8 ∙ fsw∙ COSSQ
COSSQ =
VAMP
∙
∫
0
VAMP
COSS (v) ∙ dv
1

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Demonstration System EPC9508
QUICK START PROCEDURE
The EPC9508 demonstration system is easy to set up and evaluate the
performance of the eGaN FET in a wireless power transfer application.
The EPC9508 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 current based on the setting. The pre-regulator also
monitors the temperature of the amplier and will limit the current in the
event the temperature exceeds 85°C.
1. Make sure the entire system is fully assembled prior to making elec-
trical connections and make sure jumper (JP60 is set to pre-regulator
– right 2 pins).
2. With power o, connect the main input power supply bus to +VIN
(J50). Note the polarity of the supply connector.
3. With power o, connect the control input power supply bus to +VDD
(J90). Note the polarity of the supply connector.
4. Select and connect an applicable load resistance to the device board.
5. Make sure all instrumentation is connected to the system.
6. Turn on the control supply – make sure the supply is between 7 V and
12 V (7.5 V is recommended).
7. Turn on the main supply voltage to the required value (it is recom-
mended to start at 8 V and do not exceed the absolute maximum volt-
age of 36 V).
8. 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.
9. For shutdown, please follow steps in the reverse order. Start by reduc-
ing the main supply voltage to 0 V followed by steps 6 through 2.
b. Operation bypassing the pre-regulator
In this mode, the pre-regulator is bypassed and the main power is con-
nected directly to the amplier. This allows the amplier to be operated
using an external regulator or to test at higher voltages.
In this mode there is no current or thermal protection for the eGaN FETs.
1. Make sure the entire system is fully assembled prior to making
electrical connections and remove the jumper JP60. Never connect the
main power positive (+) to J50 when operating in bypass mode.
2. With power o, connect the main input power supply ground to the
ground terminal of J50 (-) and the positive (+) to the left-side pin
of JP60.
3. With power o, connect the control input power supply bus to +VDD
(J90). Note the polarity of the supply connector.
4. Select and connect an applicable load resistance to the device board.
5. Make sure all instrumentation is connected to the system.
6. Turn on the control supply – make sure the supply is between 7 V and
12 V range (7.5 V is recommended).
7. Turn on the main supply voltage to the required value (it is recom-
mended to start at 2 V and do not exceed the absolute maximum
voltage of 52 V).
8. Once operation has been conrmed, adjust the main supply volt-
age within the operating range and observe the output voltage,
eciency and other parameters on both the amplier and device
boards. See Pre-Cautions when operating in the bypass mode
9. 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.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 (J2 and J3 as shown in Figure 4).
THERMAL CONSIDERATIONS
The EPC9508 demonstration system showcases the EPC8009
eGaN FET 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 EPC9506 / EPC9507 demonstration system has limited current and thermal pro-
tection 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. Wide coil coupling and load range variations can lead to
increased losses in the devices.
Pre-Cautions
The EPC9508 demonstration system has no controller or enhanced
protections systems and therefore should be operated with caution.
Some specic precautions are:
1. Please contact EPC at [e-mail] should the tuning of the coil be
required to change 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 evalua-
tion 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.

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Demonstration System EPC9508
+
VAMP
Q1 LZVS12
Q2
VIN
Q11
Q12
LZVS11
CZVS
LZVS1
Coil
connection
Single-
ended
operation
jumper
Pre-
regulator
Pre-regulator
bypass jumper
Figure 1: Diagram of EPC9508 Amplier Board
Figure 2: Proper Connection and Measurement Setup for the EPC9508 Amplier Board
+
7-12 VDC
Gate drive and
control supply
(note polarity)
+
6-36 VDC
VIN supply
(note polarity)
Source coil
connection
Switch-node main
oscilloscope probe
Switch-node
secondary
oscilloscope probe
Ground post
Amplier
voltage
source
jumper
Disable oscillator
Jumper
Pre-regulator
current setting
Pre-regulator
timing setting
(not installed)
Amplier
timing setting
(not installed)
Stand-o mounting
holes (x4) Pre-regulator jumper
Bypass connection
External oscillator
(remove internal jumper)
Disable Pre-Regulator
Jumper
Internal Oscillator
Jumper Amplier board – Front-side

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Demonstration System EPC9508
Figure 3: Proper Measurement of the Switch Nodes Using the Hole and Ground Post
Figure 4: ZVSTiming Diagrams
Shoot-
through
Q2 turn-on
Q1 turn-o
VAMP
0
time
ZVS
Partial
ZVS
ZVS + Diode
Conduction
Shoot-
through
Q1 turn-on
Q2 turn-o
VAMP
0 time
ZVS
Partial
ZVS
ZVS + Diode
Conduction
Do not use
probe ground lead
Ground probe
against post
Place probe tip
in large via Minimize loop

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Demonstration System EPC9508
Table 2: Bill of Materials - Amplier Board
Item Qty Reference Part Description Manufacturer Part #
1 10 C1, C2, C3, C11, C12, C13, C55,
C66, C67, C68 10nF, 100 V TDK C1005X7S2A103K050BB
2 2 C5, C15 1.0 µF, 100 V TDK C2012X7S2A105K125AB
3 4 C40, C44 C52, C60 4.7 µF, 16V TDK C1608X5R1C475K
4 2 C41, C45 22 nF, 25 V TDK C1005X7R1E223K050BB
5 5 C42, C43, C46, C47 C84 47 pF, 50 V Yageo CC0402JRNPO9BN470
6 1 C50 1 µF, 50 V Taiyo Yuden UMK107AB7105KA-T
7 2 C53, C54 2.2 nF, 50 V Yageo CC0402KRX7R9BB222
8 1 C56 1 nF, 50 V Yageo CC0402KRX7R9BB102
9 4 C57, C58, C63, C70 100 nF, 25 V TDK C1005X7R1E104K050BB
10 3 C62, C64, C65 2.2 µF, 100 V Taiyo Yuden HMK325B7225KN-T
11 4 C71, C72, C80, C81 100 nF, 25 V TDK C1608X7R1E104K
12 1 C73 DNP, 100 pF, 25 V Generic Generic
13 2 C82, C83 100 pF, 25 V TDK C1608C0G1H101J080AA
14 3 C90, C91, C92 1 µF, 25 V TDK C1608X7R1E105K
15 1 Czvs1 DNP 1 µF, 50 V Taiyo Yuden C2012X7R1H105K125AB
16 4 D74, D75, D82, D83 40 V, 30 mA Diodes Inc. SDM03U40
17 2 FB90, FB91 0.3DC 600AC Laird HZ0805E601R-10
18 1 J1 SMA Board Edge Linx CONREVSMA013.062
19 2 J44, J61 .1" Male Vert., 1 pin Würth 61300111121
20 2 JP61, JP71 Jumper 100 Würth 60900213421
21 6 J51, J70, J71, J90, JP60, JP70 .1" Male Vert., 2 pin Würth 61300311121
22 1 J50 .156" Male Vert. Würth 645002114822
23 1 L60 10 µH Würth 744314101
24 2 Lzvs1, Lzvs11 430 nH CoilCraft 2929SQ-431JEB
25 1 P49 DNP, 10 k Murata PV37Y103C01B00
26 4 P74, P75, P82, P83 DNP, 1k Murata PV37Y102C01B00
27 4 Q1, Q2, Q11, Q12 65 V, 4.1A, 138 mΩ EPC EPC8009
28 2 Q60, Q61 100 V, 6A, 30 mΩ EPC EPC2007
29 1 R47 6.04 k Panasonic ERJ-2RKF6041X
30 1 R48 2.74 k Panasonic ERJ-2RKF2741X
31 1 R49 3.3 k Panasonic ERJ-2RKF3301X
32 1 R50 40.2 k Yageo RC0402FR-0740K2L
33 1 R51 280 k Panasonic ERJ-2RKF2803X
34 1 R52 10 k Yageo RC0402FR-0710KL
35 1 R54 15 k Yageo RC0402JR-0715KL
36 3 R55, R56, R84 10Ω Yageo RC0402FR-0710RL
37 1 R57 374 k Panasonic ERJ-2RKF3743X
38 1 R58 124 k Panasonic ERJ-2RKF1243X
39 1 R59 45.3 k Panasonic ERJ-2RKF4532X
40 2 R60, R61 2.2 Ω Yageo RC0402JR-072R2L
41 1 R62 24 mΩ 1 W Susumu PRL1632-R024-F-T1
42 1 R70 47 k Stackpole RMCF0603JT47K0
43 1 R73 10 k Yageo RC0603JR-0710KL
44 1 R74, R75 75 Ω Panasonic ERJ-3EKF75R0V
45 2 R76, R77 0 Ω Yageo RC0603JR-070RL
46 1 R82 31.6 Ω Panasonic ERJ-3EKF31R6V
47 1 R83 191 Ω Panasonic ERJ-3EKF1910V
48 1 RT1 470 k at 25°C Murata NCP15WM474E03RC
50 2 TP1, TP2 SMD probe loop Keystone 5015
51 3 U40, U44, U60 100 V eGaN Driver Texas Instruments LM5113TM
52 1 U50 Step Down Controller Linear Technologies LT3741EUF#PBF
53 1 U70 Programmable Oscillator – 6.78 MHz EPSON SG-8002CE
54 2 U71, U80 2 In AND Fairchild NC7SZ08L6X
55 2 U72, U81 2 In NAND Fairchild NC7SZ00L6X
56 1 U90 5.0 V, 250 mA, DFN Microchip MCP1703T-5002E/MC

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Demonstration System EPC9508
GRH1
5 V5VHS1
5VHS1
5V
GLH1
Gate Driver
22 nF, 25 V
C41
U40 LM5113TM
GRH1
GLH1
Vamp
OutA
1μF 100 V C5
40 V 30mA D74
40 V 30mA D75
100 nF, 25 V
C72
5 V
5 V
100 nF, 25V
C71
5 V
10 k
12
R73
Deadtime Left Deadtime Right
DNP 1k
P75 DNP 1 k
P74
DNP 100 pF, 25 V
C73
A B
U72 NC7SZ00L6X
A
B
Y
U71 NC7SZ08L6X
5 V
75 Ω
1 2
R75
75 Ω
1 2
R74
42
GND
OUT3
Pgm Osc.
OE
1VCC
U70
100 nF, 25 V
C70
5 V
5 V
Oscillator
IntOsc
5 V
GRH2
5 V 5VHS2
4.7 μF, 16 V
C44
5VHS2
5 V GLH2
Gate Driver
U44 LM5113TM
L_Sig
R_Sig
GRH2
GLH2
5 V
.1" Male Vert.
1
2
J90
7.5 VDC - 12 VDC
Logic Supply Regulator
V7in
1μF, 25 V C90
1μF, 25 V
C91
V7in
5.0 V 250mA DFN
OUT
GND
IN
GND
U90
1μF, 25 V C92
Logic Supply
Vamp
GRret 1
OutB
47 k
12
R70 OSC
OSC
OSC
.1" Male Vert.
1 2
J70
Oscillator Disable
GRret2
L_Sig
R_Sig
DNP 1 μF 50 V
Czvs1
Main Amplier
Secondary Amplier
Board Standos
22 nF, 25 V
C45
4.7 μF, 16 V
C40
10 nF, 100 V
C1
10 nF, 100 V
C2
10 nF, 100 V
C3
PGND
10 nF, 100 V
C11
10 nF, 100 V
C12
10 nF, 100 V
C13
500 nH Lzvs1
ZVS Tank Circuit
Vamp Vamp
VampVamp
Vamp Vamp
VampVamp
GRret1
GRret2
1 2
.156" Male Vert.
J50
Vin
Main Supply
Vamp
Vout
SMA Board Edge
J1
DNP JMP1
Single Ended Operation Only
Vin5Vp
VoutPGND
Temp
PreRegulator EPC9508PR_r1_0.SchDoc
Vin5 V
Vout
12
470 k @ 25°C
t°
RT1
Temp
Temp
R_Sig
L_Sig
47pF, 50 V
C42
47 pF, 50 V
C43
47pF, 50 V
C46
47 pF, 50 V
C47
0 Ω
1 2
R76
0E
12
R77
OSC
IntOsc
.1" Male Vert.
1
2
J71
External Oscillator
Osc
1
.1" Male Vert.
J44
1
ProbeHole J3
1
ProbeHole J2
Ground Post
Internal / External Oscillator
Pre-Regulator
Pre-Regulator Bypass
SMD probe loop
1
TP1
SMD pr obe loop
1
TP2
Vamp
FD1
Local Fiducials
FD2
Q1
EPC8009
Q2
EPC8009
Q11
EPC8009
Q12
EPC8009
GRret2
GRret1
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND PGND
PGND
PGNDPGND
PGND
PGND
PGND
1 2
0.3DC 600AC
FB90
500 nH Lzvs11
1μF 100 V C15
GRH2 GLH2 GRH 1 GLH1
1 2
0.3DC 600AC
FB91
.1" Male Vert.
1
2
JP60
JP61
Jumper 100
JP71
Jumper 100
.1" Male Vert.
1
2
JP70
Figure 5: EPC9508 Source Board Amplier Schematic

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Demonstration System EPC9508
10
5
GND
4
UVLO
Osc
3
6
GND
21
1.5V
1.2 V
Cnt
20
19
18 17
Sync Rt
Cnt1
SS
16
15
8
9
7
EN/UVLO Vref VC Cnt2
12 13
2 1
GND
11
GND
14
U50 LT3741EUF#PBF
1 μF, 50 V
C50
10 k
12
R52
280 k
12
R51
40.2k
12
R50 HG
LG
4.7 μF, 16 V
C52
Vin
Vin
Vccint
Sns+
Vout
Vfdbk
15k
1 2
R54
2.2 nF, 50 V
C53
2.2 nF, 50 V
C54
.1" Male Vert.
1
2
J51
PreRegulator Disable
PreDis
PreDis
Vout
10 Ω
1 2
R55
10 Ω
1 2
R56
1 nF, 50 V
C56
Vin
10 uH
L60
Vout
GUPH GUPL
5Vp 5VUP
4.7 μF, 16 V C60
5VUP
5Vp
GLPH GLPL
Gate Driver
U60 LM5113TM
HGPR LGPR
2.2 Ω
1 2
R61
2.2 Ω
1 2
R60
GUPH GUPL
GLPLGLPH
Q61
EPC2007
Q60
EPC2007
Vin
100 nF, 25 V C63
SW
Sns+
1 2
24 mΩ 1 W
R62
SW
SW
Vin
Vin 10 nF, 100 V
C66
10 nF, 100 V
C67
Vin Vin
10 nF, 100 V
C68
Vin
5Vp
Vout
PGND
Buer
40 V 30 mA D82
40V 30 mA D83
100 nF, 25 V C81
5Vp
5Vp
100nF, 25V
C80
5Vp
10E
1 2
R84
Deadtime Lower
Deadtime Upper
DNP 1k
P83
DNP 1k
P82
47 pF, 50 V
C84
A B
U81 NC7SZ00L6X
A B
Y
U80 NC7SZ08L6X
5Vp
191 Ω
1 2
R83
31.6 Ω
1 2
R82
PWM
HG
PWM
HGPR
LGPR
PWM
Buer
124 k
12
R58 374 k
12
R57
Vin
Vref
3.3 k
12
R49
Vref
100 nF, 25 V
C57
DNP 10k
P49
Current Set
Temp
45.3 k
12
R59
Vref
10 nF, 100 V
C55
100 pF, 25 V
C82
100 pF, 25 V
C83
2.74 k
12
R48 6.04 k
12
R47
1
.1" Male Vert.
J61
1
ProbeHole J62
Ground Post
PGND
PGND PGND
PGND PGND PGND PGND
PGND PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND PGND
PGND
PGND PGND PGND PGND PGND PGND PGND
PGND
PGND
PGND
PGND
2.2 μF 100 V C65
2.2 μF 100 V C64
2.2 μF 100 V C62
100 nF, 25 V
C58
PGND
Figure 6: EPC9508 -Source Board Pre-Regulator Schematic

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Demonstration Board Warning and Disclaimer
The EPC9508 board is intended for product evaluation purposes only and is not intended for commercial use. Replace components on the Evaluation Board only with those parts shown on
the parts list (or Bill of Materials) in the Quick Start Guide. Contact an authorized EPC representative with any questions.
This board is intended to be used by certied professionals, in a lab environment, following proper safety procedures. Use at your own risk.
As an evaluation tool, this board 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. Ecient Power Conversion
Corporation (EPC) makes no guarantee that the purchased board is 100% RoHS compliant.
The Evaluation board (or kit) is for demonstration purposes only and neither the Board nor this Quick Start Guide constitute a sales contract or create any kind of warranty, whether express
or implied, as to the applications or products involved.
Disclaimer: EPC reserves the rightat any time, without notice,to makechanges to anyproducts described herein to improve reliability, function, or design. EPCdoes not assume anyliability
arising out of the application or use of any product or circuit described herein; neither does it convey any license under its patent rights, or other intellectual property whatsoever, nor the
rights of others.