Development Board EPC9148 - 48 V Three-level Synchronous Buck Converter, Using EPC2053 - EPC Co
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Development Board EPC9148 Quick Start Guide 48 V Three-level Synchronous Buck Converter, Using EPC2053 Revision 1.0
QUICK START GUIDE EPC9148
DESCRIPTION
The EPC9148 demonstration board is a 60 V maximum input voltage, Table 1: Performance Summary (TA = 25°C) EPC9148
12.5 A maximum output current, 19 V output voltage, ultra-thin three- Symbol Parameter Conditions Min Typ Max Units
level synchronous buck converter with only a 3.5 mm component height.
VIN Input Voltage Range (1) 44 48 60 V
It features the 40 V EPC2055 and the 100 V EPC2053 and EPC2038
GaN FETs. The purpose of this demonstration board is to simplify the VOUT Output Voltage (2) 19 V
evaluation of GaN FET-based multi-level synchronous buck converter. IOUT Output Current (3) 12.5 A
For more information on the GaN-based multilevel topology please fSW Switching frequency 400 kHz
see How2AppNote 015: How to Design an Ultra-thin, Highly Efficient, 48 VIN, 8-10 A
Multilevel DC-to-DC Converter. Peak efficiency 97.9 %
IOUT, 400 LFM
A simplified block diagram of the EPC9148 development board is shown Full load efficiency
48 VIN, 12.5 A
97.8 %
in Figure 1. It contains one EPC2053 for Q1, three EPC2055 for Q2-Q4 in the IOUT, 400 LFM
power stage, and three EPC2038 GaN FETs for the synchronous bootstrap (1) Maximum input voltage depends on inductive loading, maximum drain-source voltage
must be kept under 32 V and 80 V for EPC2055 and EPC2053 respectively. Minimum input
gate drive circuits with the uPI Semiconductor uP1966E gate drivers. voltage depends on the output voltage. When the output voltage is lower, it can operate
The board also includes on-board housekeeping power supply, digital from a lower supply voltage.
controller, current and voltage sensing, and output filter. Kelvin sensing (2) Output voltage can be programmed to be 5-20 V, contact EPC for more info.
test points of the input and output voltages are provided for accurate (3) Maximum current depends on die temperature – actual maximum current is affected
efficiency measurement. by switching frequency, voltage, thermal cooling, as well as the saturation current of the
inductor.
For more information on EPC2055, EPC2053 and EPC2038, please refer to
the datasheet available from EPC at epc-co.com. The datasheet should be
read in conjunction with this quick start guide.
VIN
Boot 1 Q1
5 V for gate drivers
Level shift
Sync PWM1 G1 HV PSU
boot
3V3 for digital
controller and
current amplifier
Boot 2 Q2
Level shift
Sync PWM2 G2
boot
CFLY CIN
VOUT
LOUT
Boot 3 Q3
Level shift
Sync PWM3 G3 Top view
boot EPC9148 development board
COUT
VCC Q4
PWM4 G4
GND
GND
VBoot(N) VBoot(N-1)
VIN_sense PWM1
VOUT_sense PWM2
Digital
VCFLY_sense controller PWM3
IOUT_sense PWM4 GN
Synchronous bootstrap
(sync boot)
Figure 1: Block diagram of the EPC9148 demonstration board
EPC – POWER CONVERSION TECHNOLOGY LEADER | EPC-CO.COM | ©2021 | | 2
QUICK START GUIDE EPC9148
QUICK START PROCEDURE 3. Making sure the initial input supply voltage is 0 V, turn on the power
and increase the voltage to the required value (do not exceed the
Demonstration board EPC9148 measures 51 mm x 40 mm x 5 mm (total) absolute maximum voltage 60 V). Output voltage regulation begins
and is easy to set up for evaluation. Refer to Figures 2-4 and follow the at 44 V input voltage or lower for lower output voltage. Probe
procedure below for proper connect and measurement setup: switching node to see switching operation as shown in Figure 4.
1. With power off, connect the input power supply to VIN and GND as 4. Once operational, adjust the load within the operating range
shown in Figure 2 from top side or as in Figure 3 from bottom side. and observe the output switching behavior, efficiency and other
2. With power off, connect the load to VOUT and GND as in Figure 2 from parameters as in Figure 4.
top side or as in Figure 3 from bottom side. 5. For shutdown, please follow the above steps in reverse.
60 VINmax
VIN Supply
(Note Polarity)
Figure 2: Power connection from top side DC Load
60 VINmax
VIN Supply
(Note Polarity)
DC Load
Figure 3: Power connection from bottom side
+
Input voltage
V measurement
(HIGH VOLTAGE!)
_
GND probing
Switch-node probing
_
Output voltage
V measurement
Figure 4: Measurement connection
+
EPC – POWER CONVERSION TECHNOLOGY LEADER | EPC-CO.COM | ©2021 | | 3QUICK START GUIDE EPC9148
CONTROLLER
VREF Gv(z)
The EPC9148 features a Microchip Technology dsPIC33CK32MP102 + Σ Compensator
Digital Signal Controller (DSC). This 100 MHz single core device is _
equipped with dedicated peripheral modules for Switched-Mode VOUT Voltage
ADC
Power Supply (SMPS) applications, such as a feature-rich 4-channel Divider
(8x output), 250 ps resolution pulse-width modulation (PWM) logic, IREF
Gi(z) D1,D2 Gp(s) IOUT Current
three 3.5 Msps Analog-To-Digital Converters (ADC), three 15 ns Σ PWM
+ Compensator Plant Sense
propagation delay analog comparators with integrated Digital-To- _ Δd2
Analog Converters (DAC) supporting ramp signal generation, three
ADC
operational amplifiers as well as Digital Signal Processing (DSP) core
with tightly coupled data paths for high-performance real-time Figure 6. Block diagram of the average current mode controller (ACMC)
control applications. with flying capacitor voltage adjust duty cycle control input.
The dsPIC33CK device is used to drive and control the converter in
a fully digital fashion where the feedback loops are implemented
and executed in software. There are three software control loops: a) VIN/2 Voltage Δd2
average current loop; b) output voltage loop and c) flying capacitor Gvc(z) Gpc(s)
Divider
ADC
+ Σ Compensator PWM Plant
voltage loop. _
VC_FLY
Average current mode control (ACMC) is implemented for output Voltage
ADC
voltage regulation. The converter is controlled by the outer voltage Divider
loop providing a reference to the inner average current loop as
shown in Figure 6. The inner current loop is adjusted to average Figure 7. Block diagram of the flying capacitor voltage controller with duty
cycle adjust output.
cross-over frequencies of 8 kHz. To balance the current reference
perturbation of the inner current loop, the outer voltage loop has
been adjusted to an average cross-over frequency of 2 kHz, which
determines the overall response time of the converter. Three mounting screws that go
through the heatsink and the
Flying capacitor voltage is regulated to ½ VIN using another inde- threaded mounting posts
pendent control loop and the loop cross-over frequency is set to
1 kHz as shown in Figure 7.
THERMAL CONSIDERATIONS
The EPC9148 is intended for bench evaluation with low ambient
temperature and convection cooling. The addition of heatsinking
and forced air cooling can significantly increase the current
rating of these devices, but care must be taken to not exceed the Heatsink
absolute maximum die temperature of 150°C. The EPC9148 board
is designed with three threading mounting posts that can be use
to easily attach a heat-spreader/heatsink as shown in Figure 8. It
only requires a thermal interface material (TIM), a custom shape
heat-spreader/heatsink, a thin insulation layer for the components
with exposed conductors such as capacitors and resistors and
screws. For more information about how to attach a heatsink, the 26.30
EPC website offers: “AN012 How to Get More Power Out of a High- 9.40 9.00
Density eGaN®-Based Converter with a Heatsink.” Unit: mm
2.50
5.76
2.60
4.70 4.80
2.50
A A A
16.00
8.40 90°
2.50
B
32.70
5.20
6.50
2.00
5.06
19.00
3.80
9.80
7.34
3.50
B B
6.54 Heatsink drawing
Figure 8: Heatsink attachment
EPC – POWER CONVERSION TECHNOLOGY LEADER | EPC-CO.COM | ©2021 | | 4QUICK START GUIDE EPC9148
1 µs/div
MEASUREMENT CONSIDERATIONS 800 kHz 6 V/div
When measuring the switch-node waveform with high-
frequency content, care must be taken to provide a high-
fidelity measurement. It is recommended to avoid long ground
connection and minimize the measurement loop.
NOTE: The switch-node probing indicated are just for sanity
check, and may not be optimal for observing the switching
transients. For accurate transient measurement, please use
EPC9093, the development board for EPC2053. For information
about measurement techniques, the EPC website offers:
“AN023 Accurately Measuring High Speed GaN Transistors”
and the How to GaN educational video series, including: Figure 9: Switch-node waveform at 48 V input to 19 V, 12.5 A output
HTG09 Design Basics - Measurement.
99
98
Total System Efficiency (%)
97
96
95
94
93
92
1 2 3 4 5 6 7 8 9 10 11 12 13
Output Current (A)
Figure 10: Total system efficiency as a function of the output current at 48 V input to 19 V output
Q1: 58.5°C Q2: 61°C
Q4: 59°C Q3: 65°C
L: 45 °C
Figure 11: Thermal image of the EPC9148 at 48 V input to 19 V, 12.5 A output with 800 LFM
forced air
EPC – POWER CONVERSION TECHNOLOGY LEADER | EPC-CO.COM | ©2021 | | 5QUICK START GUIDE EPC9148
DEVELOP YOUR OWN CONTROL PROGRAM Programming header J1
PGD, PGC, N/A
The EPC9148 board can be programmed through the GND, 3V3, MCLR
programming header J1 and used to develop control
for the three-level converter. A ribbon cable such as
FFSD-04-D-06.00-01 is needed for connection to the
programming kit. Development tools can be found at
J1
www.microchip.com/development-tools.
Ribbon
cable
MPLAB ICD 3
Figure 12: Programming connection
EPC – POWER CONVERSION TECHNOLOGY LEADER | EPC-CO.COM | ©2021 | | 6QUICK START GUIDE EPC9148
Table 2: Bill of Materials
Item Qty Reference Part Description Manufacturer Part Number
1 8 C1, C3, C4, C5, C6, C15, C17, C77 10 nF ±10% 50 V Ceramic Capacitor X7R 0402 Würth 885012205067
2 1 C2 51 pF ±5% 50 V Ceramic Capacitor NP0 0402 Samsung CL05C510JB5NNNC
3 6 C7, C13, C43, C44, C45, C69 1 µF ±20% 100 V Ceramic Capacitor X7S 0805 TDK C2012X7S2A105M125AE
4 9 C8, C14, C16, C22, C25, C68, C70, C71, C72 0.1 µF ±10% 25 V Ceramic Capacitor X7R 0402 Yageo CC0402KRX7R8BB104
5 1 C9 1 µF ±10% 25 V Ceramic Capacitor X7R 0603 Würth 885012206076
6 1 C10 10 µF ±10% 16 V Ceramic Capacitor X5R 0603 Murata GRM188R61C106KAALD
7 4 C11, C24, C36, C55 1 µF ±20% 10 V Ceramic Capacitor X5R 0402 Würth 885012105012
8 1 C12 10 µF ±20% 10 V Ceramic Capacitor X5R 0402 Samsung CL05A106MP8NUB8
9 3 C23, C26, C28 22 nF ±10% 25 V Ceramic Capacitor X7R 0402 Würth 885012205052
10 1 C27 0.22 µF ±10% 25 V Ceramic Capacitor X7R 0402 TDK CGA2B3X7R1E224K050BB
11 6 C34, C35, C46, C47, C67, C78 4.7 µF ±10% 100 V Ceramic Capacitor X7S 1210 TDK CGA6M3X7S2A475K200AB
12 5 C39, C40, C41, C42, C73 0.22 µF ±10% 100 V Ceramic Capacitor X7S 0603 Taiyo Yuden HMK107C7224KAHTE
13 6 C48, C49, C50, C51, C52, C53 2.2 µF ±10% 50 V Ceramic Capacitor X5R 0603 Murata GRM188R61H225KE11D
14 1 C54 33 pF ±5% 50 V Ceramic Capacitor NP0 0402 Würth 885012005058
15 2 C57, C58 100 µF 25 V Tantalum Polymer Capacitor 2917 Kemet T521X107M025ATE03
16 8 C59, C60, C61,C62, C63, C64, C65, C66 22 µF ±20% 25 V Ceramic Capacitor X5R 0805 TDK C2012X5R1E226M125AC
17 1 C76 2.2 µF ±20% 25 V Ceramic Capacitor X5R 0402 TDK C1005X5R1E225M050BC
18 6 D1, D2, D3, D6, D8, D10 Diode Schottky 40 V 200 mA (DC) Diodes BAS40LP-7
19 3 D5, D7, D9 Zener Diode 5.1 V 250 mW ±6% Diodes BZT52C5 V1LP-7
20 1 J1 Connector Header Surface Mount 6 position 0.050 Würth 62130621021
21 1 L1 68 µH Shielded Wirewound Inductor 540 mA 840 mΩ Würth 74404042680
22 1 L3 2.4 µH Ferrite Inductor 15 A 1mΩ Würth 7443762504022
23 1 Q1 N-Channel 100 V 3.8 mΩ GaN FET EPC EPC2053
24 3 Q2, Q3, Q4 N-Channel 40 V 3.5 mΩ GaN FET EPC EPC2055
25 3 Q8, Q9, Q10 100 V Internal Gate Diode 3300 mΩ GaN FET EPC EPC2038
26 1 R1 15 kΩ ±0.1% 0.063 W, 1/16 W Chip Resistor 0402 Panasonic ERA-2AEB153X
27 1 R2 2 kΩ ±0.1% 0.063 W, 1/16 W Chip Resistor 0402 Yageo RT0402BRD072KL
28 3 R3, R4, R5 39 kΩ ±0.1% 0.2 W, 1/5 W Chip Resistor 0603 Panasonic ERJ-PB3B3902V
29 2 R6, R8 2 kΩ ±0.1% 0.1 W, 1/10 W Chip Resistor 0603 Panasonic ERA-3AEB202V
30 1 R7 2.2 kΩ ±0.1% 0.2 W, 1/5 W Chip Resistor 0603 Panasonic ERJ-PB3B2201 V
31 1 R9 0 Ω Jumper 0.1 W, 1/10 W Chip Resistor 0603 Panasonic ERJ-3GEY0R00V
32 4 R10, R11, R12, R14 15 kΩ ±0.5% 0.063 W, 1/16 W Chip Resistor 0402 Yageo RT0402DRE0715KL
33 1 R13 1 kΩ ±5% 0.063 W, 1/16 W Chip Resistor 0402 Yageo RC0402JR-071KL
34 1 R15 36 kΩ ±0.1% 0.2 W, 1/5 W Chip Resistor 0603 Panasonic ERJ-PB3B3602V
35 1 R16 100 kΩ ±1% 0.063 W, 1/16 W Chip Resistor 0402 Yageo RT0402FRE07100KL
36 1 R17 20 Ω ±1% 0.1 W, 1/10 W Chip Resistor 0402 Panasonic ERJ-2RKF20R0X
37 1 R18 31.6 kΩ ±1% 0.063 W, 1/16 W Chip Resistor 0402 Panasonic RC0402FR-0731K6L
38 1 R23 10 kΩ ±5% 0.063 W, 1/16 W Chip Resistor 0402 Yageo RC0402JR-0710KL
39 4 R25, R54, R47, R48 0 Ω Jumper 0.1 W, 1/10 W Chip Resistor 0402 Panasonic ERJ-2GE0R00X
40 7 R27, R28, R31, R32, R38, R39, R40 1 Ω ±1% 0.063 W, 1/16 W Chip Resistor 0402 Yageo RC0402FR-071RL
41 3 R29, R33, R41 27 kΩ ±5% 0.1 W, 1/10 W Chip Resistor 0402 Panasonic ERJ-2GEJ273X
42 3 R30, R37, R42 4.7 Ω ±1% 0.063 W, 1/16 W Chip Resistor 0402 Stackpole RMCF0402FT4R70
43 2 R44, R45 50 Ω @ 100 mHz Ferrite Bead 1206 12A 1.6mΩ Murata BLM31SN500SH1L
44 1 R46 1 mΩ ±5% 1 W Chip Resistor Wide 0805 Susumu KRL2012E-M-R001-J-T5
45 3 S2, S3, S5 Round Standoff Threaded M2x0.4 Steel 0.039 Würth 9774010243R
46 4 TP1, TP2, TP3, TP4 PC Test Point Keystone 5015
47 1 U1 Current Sense Amplifier 1 Circuit SOT-23-6 Microchip MCP6C02T-100E/CHY
dsPIC dsPIC™ 33CK Microcontroller IC 16-Bit 100 mHz
48 1 U2 Microchip DSPIC33CK32MP102-I/2N
32KB (32K x 8) FLASH 28-UQFN (6x6)
Buck Switching Regulator IC Output 150 mA 10-VFDFN
49 1 U4 Texas Instruments LM5165DRCR
Exposed Pad
50 1 U5 Linear Voltage Regulator IC 500 mA 6-WSON Texas Instruments TLV75533PDRVR
51 3 U9, U10, U11 Dual-Channel Gate Driver for GaN FETs uPI uP1966E
EPC – POWER CONVERSION TECHNOLOGY LEADER | EPC-CO.COM | ©2021 | | 7QUICK START GUIDE EPC9148
Table 3. Optional Components
Item Qty Reference Part Description Manufacturer Part Number
1 1 C56 33 pF ±5% 50 V Ceramic Capacitor NP0 0402 Würth 885012005058
Black-Oxide 18-8 Stainless Steel Phillips Flat Head
2 3 N/A McMaster-Carr 91698A201
Screws, M2 x 0.4 mm Thread, 5 mm
3 1 N/A Ribbon Cable Samtec FFSD-04-D-06.00-01
4 1 N/A Thermal Pad t-global TGX
EPC – POWER CONVERSION TECHNOLOGY LEADER | EPC-CO.COM | ©2021 | | 8VOUT
3V3
VIN VCP VCN
R17
MCP6C02T -100E/CHY
6
20 Ω R5
R3 R4 U1
39 K 39 K 39 K ISNS+ 3 V IP V DD
V OUT 1 R54 ISENSE 3V3 J1
VCN_SNS GM1 RM 3
ISNS- 4 V IM
QUICK START GUIDE
VIN_SNS VCP_SNS 0Ω MCLR
MCLR
R1 3V3
1
GM2 ISENSE 3V3 3V3 VDD
V REF 5
15 K ISNS+ V SS R23 RET
R6 R7 R8 PGD
C3 C4 C5 PCD
2
VOUT_SNS 2K 2.2 K 2K 10 k PGC
10 nF, 25 V 10 nF, 25 V 10 nF, 25 V C76 C68 PCK
C2
2
C77 N/A
51pF, 50V 2.2 μF, 25 V 0.1 μF, 25 V
R2 10 nF, 50V
C1 MCLR Pickit/PS-ID program header
2K
10 nF, 25 V
Voltage sense Current sense Programming and Communications
VCN_SNS R10 OAIN- R11 OA1OUT
U2 15 K 15 K
PWMQ1 1 28 PWMQ3
RP46/PWM1H/RB14 RP45/PWM2L/RB13
PWMQ4 2 27 PWMQ2 VCP_SNS R12
RP47/PWM1L/RB15 TDI/RP44/PWM2H/RB12 OAIN+
MCLR 3 26
/MCLR TCK/RP43/PWM3L/RB1 1 15 K
OA1OUT 4 25
OA1OUT/AN0/CMP1A/IBIAS0/RA0 TMS/RP42/PWM3H/RB10 R14
OAIN- 5 24 3V3
OA1IN-/ANA1/RA1 VDD 15 K
OAIN+ 6 23
OA1N+ /AN9/RA2 VSS
VIN_SNS 7 22 PGC Op-amp
DACOUT/AN3/CMP1C/RA3 PGC1/AN1 1/RP41/SDA1/RB9
VCN_SNS R19 0 Ω DNP 8 21 PGD
AN4/CMP3B/IBIAS3/RA4 PGD1/AN10/RP40/SCL1/RB8
3V3 9 20 VOUT_SNS
AVDD TDO/AN2/CMP3A/RP39/RB7
EPC – POWER CONVERSION TECHNOLOGY LEADER | EPC-CO.COM | ©2021 |
10 19
AVSS PGC3/RP38/SCL2/RB6
3V3 11 18
VDD PGD3/RP37/SDA2/RB5
12 17
VSS PGC2/OA2IN+ /RP36/RB4
VCP_SNS R20 0 Ω DNP 13 16 3V3 3V3 3V3 3V3 3V3 3V3
OSCI/CLKI/AN5/RP32/RB0 PGD2/OA2IN-/AN8/RP35/RB3
14 15 ISENSE
OSCO/CLKO/AN6/RP33/RB1 OA2OUT/AN1/AN7/ANA0/CMP1D/CMP2D/CMP3D/RP34/INT0/RB2
DSPIC33CK32MP102-I/2N
C6 C8 C14 C15 C16 C17
10 nF, 25 V 0.1 μF, 25 V 0.1 μF, 25 V 10 nF, 25 V 0.1 μF, 25 V 10 nF, 25 V
VIN R9 Decoupling Caps for the PIC
0Ω
2
R13
C7 1K
1 μF, 100 V Vin U4
7 EN LM5165DRCR
Reg
9 HYS L1 U5
UVLO SW 1 5VCC R25
Logic 5VCC 3V3
IN OUT
RT 68 μH 540 mA R16 0Ω
5 NC NC
Osc 100K C10
C9 1 μF, 25 V 10 μF, 10 V
6 Pgood FB 8 1 μF, 25 V 10 μF, 16 V EN GND C11 C12
TLV75533PDRVR
R18
4 SS Ilim 3 31.6 K
1.223V
Gnd
10
Vin to 5 V 5 V to 3.3 V
Housekeeping power supply
Figure 13: EPC9148 housekeeping power supply and controller schematic
EPC9148
| 9Q8
U9
BTSTR2 1 Ω R27 BTSTR1 BTSTR1
EPC2038 1 Ω R28 G1
100 V 2.8 Ω K
A K C22
D5 0.1 μF, 25 V PWMQ1 VCP
D1 BZT52C5 V1LP-7 A
R29 VCP 5 VCC
C23 27 K
BTSTR2
22 nF, 25 V
QUICK START GUIDE
GND
C70
0.1 μF, 25 V A 5 VCC
SW R30 D6 uP1966A
C24
4.7 Ω 1 μF, 25 V
K GND
G2ON
GND
U10
BTSTR2
Q9
BTSTR2 G2ON 1 Ω R32 G2
BTSTR3 1 Ω R31
EPC2038
100 V 2.8 Ω PWMQ2 SW
K
A K C25
D7 5 VCC
0.1 μF, 25 V
D2 BZT52C5 V1LP-7 A
R33
C26 27 K SW GND
BTSTR3 22 nF, 25 V
EPC – POWER CONVERSION TECHNOLOGY LEADER | EPC-CO.COM | ©2021 |
5 VCC
C71 uP1966A
0.1 μF, 25 V C55
A
R37 1 μF, 25 V
D8 GND
4.7 Ω
VCN
K
G3ON GND
U11
BTSTR3
G3ON 1 Ω R38 G3
Q10
PWMQ3 VCN
5 VCC 1 Ω R39 BTSTR3
EPC2038 5 VCC
100 V 2.8 Ω K G4ON 1 Ω R40 G4
A K C27 PWMQ4
D9 0.22 μF, 25 V
D3 BZT52C5 V1LP-7 A 5 VCC
C28 R41
27 K VCN uP1966A
5 VCC 22 nF, 25 V C36
1 μF, 25 V Gate driver circuit
GND
C72
0.1 μF, 25 V A
R42 D10 GND
4.7 Ω
K
GND G4ON Synchronous bootstrap
Figure 14: EPC9148 gate driver schematic
EPC9148
| 10VIN VIN VIN VIN VIN VOUT VOUT
+ C57 + C58
C73 C39 C40 C41 C42 100 μF, 25 V 100 μF, 25 V
220 nF, 100 V 220 nF, 100 V 220 nF, 100 V 220 nF, 100 V 220 nF, 100 V
QUICK START GUIDE
GND GND GND GND GND
GND GND
VOUT VOUT VOUT VOUT VOUT VOUT VOUT VOUT
VIN VIN VIN VIN VIN VIN VIN VIN VIN VIN VIN
C13 C69 C43 C44 C45 C46 C47 C34 C35 C67 C78
C59 C60 C61 C62 C63 C64 C65 C66
1 μF, 100 V 1 μF, 100 V 1 μF, 100 V 1 μF, 100 V 1 μF, 100 V 4.7 μF, 100 V 4.7 μF, 100 V 4.7 μF, 100 V 4.7 μF, 100 V 4.7 μF, 100 V 4.7 μF, 100 V
22 μF, 25 V 22 μF, 25 V 22 μF, 25 V 22 μF, 25 V 22 μF, 25 V 22 μF, 25 V 22 μF, 25 V 22 μF, 25 V
GND GND GND GND GND GND GND GND
GND GND GND GND GND GND GND GND GND GND GND
Input capacitors Output capacitors
VIN
TP1
1
SMD probe loop
EPC – POWER CONVERSION TECHNOLOGY LEADER | EPC-CO.COM | ©2021 |
R15* Q1
36 K EPC2053 S3
G1
9774010243R
VCP S2
9774010243R
Q2
G2 S5
EPC2055
VCP VCP VCP
1 R44 2 VOUT
9774010243R
L3 50 Ω @ 100 MHz TP3
SW 1 R45 2 R46
C53 C50 C52 1
2.4 μH 50 Ω @ 100 MHz 1 mΩ
2.2 μF, 50 V 2.2 μF, 50 V 2.2 μF, 50 V SMD probe loop
GND
Q3 C54 R47 R48
VCN VCN VCN
G3 0Ω 0Ω
EPC2055 33 pF, 50 V C56
VCP VCP VCP Heatspreader Standoffs
33 pF, 50 V
ISNS+
ISNS-
GND
DNP
V CN
C48 C51 C49
2.2 μF, 50 V 2.2 μF, 50 V 2.2 μF, 50 V FD1 FD2 FD3
Q4
VCN VCN VCN G4 EPC2055 PCB Fiducial
Flying capacitors
TP2
1
SMD probe loop
Power stage
TP4
1
SMD probe loop
* Start-up patent pending
GND
Figure 15: EPC9148 power stage schematic
EPC9148
| 11QUICK START GUIDE EPC9148 EPC would like to acknowledge Microchip Technology Inc. (www.microchip.com) for their support of this project. Microchip Technology Incorporated is a leading provider of smart, connected and secure embedded control solutions. Its easy-to-use development tools and comprehensive product portfolio enable customers to create optimal designs, which reduce risk while lowering total system cost and time to market. The company’s solutions serve customers across the industrial, automotive, consumer, aerospace and defense, communications and computing markets. The EPC9148 system features the dsPIC33CK32MP102 16-Bit Digital Signal Controller with High-Speed ADC, Op Amps, Comparators and High- Resolution PWM. Learn more at www.microchip.com. EPC would like to acknowledge Würth Elektronik (www.we-online.com) for their support of this project. Würth Elektronik is a premier manufacturer of electronic and electromechanical passive components. EPC has partnered up with WE for a variety of passive component requirements due to the performance, quality and range of products available. The EPC9148 development board features various WE product lines including power inductors, capacitors, and connectors. One of the highlights on the board is a custom super-thin power inductor which helps to enable the power density of this design. Also featured on the board are the WE-LQS SMT power inductors, the WCAP-CSGP MLCC capacitors, and WR-PHD 1.27 mm SMT Dual Pin Header connectors. Learn more at www.we-online.com. EPC – POWER CONVERSION TECHNOLOGY LEADER | EPC-CO.COM | ©2021 | | 12
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Demonstration Board Notification
The EPC9148 board is intended for product evaluation purposes only. It is not intended for commercial use nor is it FCC approved for resale. 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 certified 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. Efficient Power Conversion Corpora-
tion (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 right at any time, without notice, to make changes to any products described herein to improve reliability, function, or design. EPC does not assume any liability
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
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