ADP1046A LLC Resonant Converter with Synchronous Rectification

ADP1046A LLC resonant converter
with Synchronous Rectification
12V/600W
PRD1486
FEATURES
600W LLC resonant topology
Input voltage range: 360 V dc to 420 V dc
Output voltage: 12 V dc
Nominal output current: 50 A
7 PWM outputs including Auxiliary PWM
Burst mode control in soft-start state and light load mode
OrFET control
On-board tests for housekeeping functions
Graphical user interface (GUI) software
I2C serial interface to PC
Calibration and trimming
CAUTION
This evaluation board uses high voltages and currents. Extreme caution must be taken especially on the primary
side, to ensure safety for the user. It is strongly advised to power down the evaluation board when not in use. A
current limited power supply is recommended as input as no fuse is present on the board.
ADP1046A EVALUATION BOARD OVERVIEW
This evaluation board features the ADP1046A in a switching power supply application. With the evaluation board and
software, the ADP1046A can be interfaced to any PC running Windows 2000/XP/Vista/NT/7 via the computer's USB port. The
software allows control and monitoring of the ADP1046A internal registers. The board is set up for the ADP1046A to act as an
isolated switching power supply with a rated load of 12V/50A from an input voltage ranging from a 360VDC to 420VDC.
Figure 1 – The ADP1046A 600W LLC EVB
Rev. 1.0
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statutory including, but not limited to, any implied warranty of merchantability or fitness for a
particular purpose. No license is granted by implication or otherwise under any patents or other
intellectual property by application or use of reference designs. Information furnished by Analog
Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog
Devices for its use, nor for any infringements of patents or other rights of third parties that may
result from its use. Analog Devices reserves the right to change devices or specifications at any
time without notice. Trademarks and registered trademarks are the property of their respective
owners. Reference designs are not authorized to be used in life support devices or systems.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
www.analog.com
Tel: 781.329.4700
Fax: 781.461.3113
©2009 Analog Devices, Inc. All rights reserved.
LLC resonant converter
12V/600W
PRD1486
Rev. 1.2 | Page 2 of 30
LLC resonant converter
12V/600W
PRD1486
TABLE OF CONTENTS
Features ....................................................................................................................................................................................... 1
CAUTION ..................................................................................................................................................................................... 1
BLOCK DIAGRAM ....................................................................................................................................................................... 3
BOARD SPECIFICATION ............................................................................................................................................................ 3
TOPOLOGY AND circuit description ............................................................................................................................................ 5
CONNECTORS ............................................................................................................................................................................ 6
SETTING FILES AND EEPROM .................................................................................................................................................. 6
BOARD EVALUATION ................................................................................................................................................................. 8
EQUIPMENT ............................................................................................................................................................................ 8
SETUP ...................................................................................................................................................................................... 8
BOARD SETTINGS ................................................................................................................................................................ 10
Theory of operation during startup ............................................................................................................................................. 10
FLAGS SETTINGS CONFIGURATIONS ................................................................................................................................ 11
PWM SETTINGS........................................................................................................................................................................ 12
BOARD EVALUATION AND TEST DATA ................................................................................................................................... 13
STARTUP ............................................................................................................................................................................... 13
OVERCURRENT AND SHORT CIRCUI PROTECTION ......................................................................................................... 13
LLC CONVERTER & SR PWM TIMING ................................................................................................................................. 13
SYNCHRONOUS RECTIFIER Voltage Stress ........................................................................................................................ 14
OUTPUT VOLTAGE RIPPLE .................................................................................................................................................. 14
DYNAMIC TEST ..................................................................................................................................................................... 15
ZVS WAVEFORMS FOR Q6 .................................................................................................................................................. 15
CLOSED LOOP FREQUENCY RESPONSE .......................................................................................................................... 16
EFFICIENCY .......................................................................................................................................................................... 17
TRANSFORMER SPECIFICATION ........................................................................................................................................... 17
APPENDIX I – SCHEMATIC ...................................................................................................................................................... 19
APPENDIX IV – LAYOUT ........................................................................................................................................................... 24
NOTES ....................................................................................................................................................................................... 29
REVISION HISTORY
03/08/2014—Revision 1.0: SPM
Rev. 1.2 | Page 3 of 30
LLC resonant converter
12V/600W
PRD1486
BLOCK DIAGRAM
Sync RecPifier
Half-Bridge LLC
Vin
Q5
Q1
SOunP
ResisPor
Vin
Or-ing
+12V
Q2
Load
CurrenP
Q6
GaPe driver
ADP3654
ACSNS
Local
Sense
12V
RemoPe
Sense
SR
PWM
Iso-gaPe driver
ADUM4223
Secondary Side
DigiPal ConProl
Primary
currenP
CT
RTD
I2C
ADP1046A
(TemperaPure sense)
PS ON/OFF
PoRer Good
+6V
(for 3.3V LDO)
+15V
(for supply Oring FET)
AUX POWER
Figure.2 – The LLC EVB Block Diagram
BOARD SPECIFICATIONS
Specification
VIN
MIN
TYP
MAX
Units
360
400
420
V
VOUT
IOUT
12
0.0
V
50
62.5
Overload current (OCP limit)
62.5
Efficiency @ 50% loading
Switching frequency
Output Voltage Ripple
96.3%
49
82
Notes
403.2
170
Table 1 - Target Specifications
Rev. 1.2 | Page 4 of 30
A
Need 11 CFM cooling
A
OCP delay time 10ms
%
Vin= 400V Iout=25A
KHz
mV
At 50A load
LLC resonant converter
12V/600W
PRD1486
TOPOLOGY AND CIRCUIT DESCRIPTION
This application note consists of the ADP1046A in an isolated DC/DC switching power supply that is LLC resonant topology
with synchronous rectification. The circuit is designed to provide a rated output load of 12V/50A from a nominal input voltage
of 400VDC. The ADP1046A can provide functions such as the output voltage regulation, output over voltage protection, input
and output current protection, primary cycle by cycle protection, and over temperature protection. Figure 2 shows the block
diagram about the built reference design board. The auxiliary power supply starts up at 50VDC and provides power to the
ADP1046A through a 3.3V LDO, the iCoupler isolation gate drivers, and the synchronous rectifier drivers.
The auxiliary power supply uses transformer (T1) and IC (U1) to generate a 12V rail on the primary side to power the iCoupler
isolation devices (MOSFET drivers), a 15V rail on the secondary side to supply the OrFET and a 6V rail on the secondary side
to power the ADP3654 that is the gate driver IC for driving synchronous rectifier and the ADP1046A using the 3.3V LDO. This
auxiliary supply starts up when Vin higher than 50VDC.
The primary side consists of the input terminals (J5, J6), switches (Q5, Q6), the current sense transformer (T2) and the main
transformer (T3) which include one resonant choke Lm. There are also resonant inductor (L1) and resonant capacitor (C26,
C27) that the LLC resonant converter can be operated in zero voltage switching (ZVS) at all load conditions. The ADP1046A
is situated on the secondary side and is powered via the auxiliary power supply or the USB connector via the LDO. The gate
signal for the primary switches is generated by the ADP1046A through the iCouplers and fed into the MOSFET drivers (U2).
The secondary (isolated) side of the transformer consists of a center- tapped winding. The synchronous rectifier driver (U3)
provides the drive signals for the switches (Q2~Q4, Q6~Q8) in SR board. The output inductor (L1) and output capacitor
(C9~C19) act as a low pass filter for the output voltage. The output voltage is fed back to the ADP1046A using a voltage
divider and has a nominal voltage of 1V which is differentially sensed. Output current measured using a sense resistor
(R10~R13) which is also differentially sensed. To protect the synchronous rectifiers from exceeding the peak reverse voltage
an RCD clamp is implemented (D2, D5, R3, R6, C1, C2).
The primary current is sensed through the CS1 pin with a small RC time constant (R24, C23) that act as a low pass filter to
remove the high frequency noise on the signal. An additional RC can be placed, but the internal Σ-Δ ADC naturally averages
the signal. The position of the current transformer is placed in series with the resonant inductor to avoid saturation. The full
wave rectifier is used in secondary side in Half-Bridge LLC topology.
The SR gate signal is made by self-excited method. The secondary winding sense voltage (SR mosfet Vds) is divided and fed
to ACSNS pin to produce the SR gate signals. The Oring FET control is also implemented in this reference board for the
current sharing application.
Capacitor (C34) is a YCAP that reduces common mode noise from the transformer.
The 4 pin I2C communication connector also presents in the ADP1046A daughter card. This allows the PC software to
communicate with the IC through the USB port of the PC. The user can easily change register settings on the ADP1046A, and
monitor the status registers. It is recommended that the USB dongle be connected directly to the PC, not via external hub.
Switch (SW1) acts as a hardware PS_OFF switch. The polarity is configured using the GUI to be active high.
Rev. 1.2 | Page 5 of 30
LLC resonant converter
12V/600W
PRD1486
CONNECTORS
The following table lists the connectors on the board:
Connector
Evaluation Board Function
J5
DC Input positive terminal
J6
DC Input negative terminal
J1
Output voltage positive terminal
J2
Output voltage negative terminal
J3
Socket for ADP1046A daughter card
J1
I2C connector on the ADP1046A daughter
card
Table 2 - Board connectors
The pin outs of the USB dongle are given below:
Pin (left to
right)
Function
1
5V
2
SCL
3
SDA
4
Ground
Table 3 - I2C connector pin out descriptions
Figure 3 – I2C connector (pin1 on left)
SETTING FILES AND EEPROM
The ADP1046A communicates with the GUI software using the I2C bus.
Figure 3 - ADP1046A and GUI interaction
Rev. 1.2 | Page 6 of 30
LLC resonant converter
12V/600W
PRD1486
The register settings (having extension .46r) and the board settings (having extension .46b) are two files that are associated
with the ADP1046A software. The register settings file is contains information such as the over voltage and over current limits,
softstart timing, PWM settings etc. that govern the functionality of the part. The ADP1046A stores all its settings in the
EEPROM.
The EEPROM on the ADP1046A does not contain any information about the board, such as current sense resistor, output
inductor and capacitor values. This information is stored in board setup file (extension .46b) and is necessary for the GUI to
display the correct information in the ‘Monitor’ tab as well as ‘Filter Settings’ window. The entire status of the power supply
such as the ORFET and synchronous rectifiers enable/disable, primary current, output voltage and current can be thus digitally
monitored and controlled using software only. Always make sure that the correct board file has been loaded for the board
currently in use.
Each ADP1046A chip has trim registers for the temperature, input current and the output voltage and current, and ACSNS.
These can be configured during production and are not overwritten whenever a new register settings file is loaded. This is
done in order to retain the trimming of all the ADCs for that corresponding environmental and circuit condition (component
tolerances, thermal drift, etc.). A guided wizard called the ‘Auto Trim’ is started which trims the above mentioned quantities so
that the measurement value matches the valued displayed in the GUI to allow ease of control through software.
Rev. 1.2 | Page 7 of 30
LLC resonant converter
12V/600W
PRD1486
BOARD EVALUATION
EQUIPMENT
• DC Power Supply (360-460V, 600W): Chroma
• Electronic Load (80V/600W): Chroma 6314
• Oscilloscope with differential probes: Lecroy 610Zi
• PC with ADP1046A GUI installed
• Precision Digital Voltmeters (Agilent 34410A) for measuring DC current and voltage
SETUP
NOTE: DO NOT CONNECT THE USB CABLE TO THE EVALUATION BOARD UNTIL THE SOFTWARE HAS
FINISHED INSTALLING
1.
Install the ADP1046A software by inserting the installation CD. The software setup will start automatically and a guided
process will install the software as well as the USB drivers for communication of the GUI with the IC using the USB
dongle.
2.
Insert the daughter card in connector J3
3.
Ensure that the PS_ON switch (SW1 on schematic) is turned to the OFF position. It is located on the bottom right half of
the board.
4.
Connect one end of USB dongle to the board and the other end to the board to the USB port on the PC using the “USB to
I2C interface” dongle.
5.
The software should report that the ADP1046A has been located on the board. Click “Finish” to proceed to the Main
Software Interface Window. The serial number reported on the side of the checkbox indicates the USB dongle serial
number. The windows also displays the device I2C address.
Figure 4 - ADP1046A address of 50h in the GUI
6.
If the software does not detect the part it enters into simulation mode. Ensure that the connecter is connected to the
daughter card. Click on ‘Scan for ADP1046A now’ icon (magnifying glass) located on the top right hand corner of the
screen.
Figure 5 - “Scan for ADP1046A Now’ icon
Rev. 1.2 | Page 8 of 30
LLC resonant converter
12V/600W
7.
PRD1486
Click on the “Load Board Settings” icon (fourth button from the left) and select the ADP1046A_FBPS_600W_xxxx.46b file.
This file contains all the board information including values of shunt and voltage dividers. Note: All board setting files have
an extension of .46b.
Figure 6 - Different icons on dashboard for loading and saving .46r and .46b files
8. The IC on the board comes preprogrammed and this step is optional. The original register configuration is stored in the
ADP1046A_FBPS_600W_xxxx.46r register file (Note: All register files have an extension of .46r). The file can be loaded using
the second icon from the left in Figure 7.
9. Connect a DC power source (400VDC nominal, current limit to ~2A) and an electronic load at the output set to 1 Ampere.
10. Ensure that the differential probes are used and the ground of the probes are isolated if oscilloscope measurements are
made on the primary side of the transformer.
rd
11. Click on the Dashboard settings (3 icon in Figure and turn on the software PS_ON)
12. The board should now up and running, and ready for evaluation. The output should now read 12 VDC.
13. Click on the ‘MONITOR’ tab and then on the Flags and readings icon. This window provides a snapshot of the entire state
of the PSU in a single user friendly window.
Rev. 1.2 | Page 9 of 30
LLC resonant converter
12V/600W
PRD1486
BOARD SETTINGS
The following screenshot displays the board settings.
Figure 7 - Main Setup window of ADP1046A GUI
THEORY OF OPERATION DURING STARTUP
The following steps briefly describe the startup procedure of the ADP1046A and the power supply and the operation of the
state machine for the preprogrammed set of registers that are included in the design kit.
1.
The on board auxiliary power starts up at approximately 50VDC. This provides a drive voltage on the isolated side to
an LDO (3.3V) that powers up the ADP1046A. After VDD (3.3V) is applied to the ADP1046A it takes approximately
20-50µs for VCORE to reach 2.5V. The digital core is now activated and the contents of the registers are downloaded
in the EEPROM. The ADP1046A is now ready for operation.
2.
PS_ON is applied. The power supply begins the programmed softstart ramp of 20ms (programmable).
3.
Since the ‘softstart from pre-charge’ setting is active the output voltage is sensed before the softstart ramp begins.
Depending upon the output voltage level of the effective softstart ramp is reduced by the proportional amount.
4.
The PSU now is running in steady state. PGOOD1 turns on after the programmed debounce.
5.
If a fault is activated during the soft-start or steady state, the corresponding flag will be set and the programmed
action will be taken such as disable PSU and re-enable after 1 sec or ‘Disable SR and OrFET, Disable OUTAUX’ etc.
Rev. 1.2 | Page 10 of 30
LLC resonant converter
12V/600W
PRD1486
FLAGS SETTINGS CONFIGURATIONS
Basically when a flag is triggered, the ADP1046A state machine waits for a programmable debounce time before taking any
action. The response to each flag can be programmed individually. The flags can be programmed in a single window by
selecting the FLAG SETTINGS icon in the MONITOR tab in the GUI. This monitor window shows all the fault flags (if any) and
the readings in one page. The ‘Get First Flag’ button determines the first flag that was set in case of a fault event.
Figure 8 - Fault Configurations
Rev. 1.2 | Page 11 of 30
LLC resonant converter
12V/600W
PRD1486
PWM SETTINGS
The ADP1046A has a fully programmable PWM setup that controls 7 PWMs. Due to this flexibility the IC can function in
several different topologies such as any isolated buck derived topology, push pull, flyback and also has the control law for
resonant converters.
Each PWM edge can be moved in 10ns steps to achieve the appropriate deadtime needed and the maximum modulation limit
sets the maximum duty cycle.
Figure 9 – PWM Settings window in the GUI
PWM
Switching element being controlled
OUTB,OUTD
Primary switch PWM configured for Half-Bridge
LLC resonant topology
SR1-SR2
Synchronous rectifier PWMs
OUTAUX
N/A
Table 4 –PWMs and their corresponding switching element
Rev. 1.2 | Page 12 of 30
LLC resonant converter
12V/600W
PRD1486
BOARD EVALUATION AND TEST DATA
STARTUP
Figure 11 - Startup at 400VDC, 600W load(software PSON)
Green trace: Input voltage, 100V/div, 5ms/div
Yellow trace: Output voltage, 2V/div, 5ms/div
Blue trace Load current, 10A/div, 5ms/div
Red trace: PWM signal 2V/div, 5ms/div
Figure 10 - Startup at 400VDC, 0W load(software PSON)
Green trace: Output voltage, 2V/div, 5ms/div
Yellow trace: PWM signal 2V/div, 5ms/div
Blue trace Load current, 10A/div, 5ms/div
Red trace: Input voltage, 100V/div, 5ms/div
OVERCURRENT PROTECTION
Figure 13 –Over current protection, 600Wto output shorted,
Green trace: Output voltage, 2V/div, 500us/div
Blue trace: Load current, 100A/div, 500us/div
Figure 12 - 65A load(Action to shutdown after ~10ms)
Green trace: Output voltage, 2V/div, 5ms/div
Blue trace: Load current, 20A/div, 5ms/div
Rev. 1.2 | Page 13 of 30
LLC resonant converter
12V/600W
PRD1486
LLC CONVERTER & SR PWM TIMING
Figure 15 –The PWM timing of LLC converter and SR @ Io=50A
Yellow Trace: OUTB
Red Trace: OUTD
Blue Trace: ACSNS
Green Trace: SR1
Figure 14 –The PWM timing of LLC converter and SR @ Io=20A
Yellow Trace: OUTB
Red Trace: OUTD
Blue Trace: ACSNS
Green Trace: SR1
SYNCHRONOUS RECTIFIER STRESS
OUTPUT VOLTAGE RIPPLE
Figure 16 – Synchronous rectifier MOSFET Peak reverse voltage at 600W
load, 400VDC, 50V/div, 2us/div
Rev. 1.2 | Page 14 of 30
Figure 17 – Output voltage AC coupled
400VDC, 50A, 100mV/div, 5us/div..
LLC resonant converter
12V/600W
PRD1486
TRANSIENT VOLTAGE AT 400VDC (NOMINAL INPUT VOLTAGE)
LOAD STEP OF 0-50%
LOAD STEP OF 50-100%
Figure 19 – Output voltage transient, 10ms/div
Yellow trace: output voltage, 2V/div 2A/div
Red Trace: OUTB (LLC gate signal)
Blue Trace: output current, 20A/div
Green trace :input voltage , 100V/div
Figure 18 – Output voltage transient, 10ms/div
Yellow trace: output voltage, 2V/div 2A/div
Red Trace: OUTB (LLC gate signal)
Blue Trace: output current, 20A/div
Green trace :input voltage , 100V/div
ZVS WAVEFORMS FOR Q6
Figure 20–Resonant transition at 600W, 1us/div
Green trace: Q6 Vds
Yellow trace: Q6 Vgs
Blue Trace: Io, 10A/div
Red trace :input voltage , 100V/div
Rev. 1.2 | Page 15 of 30
LLC resonant converter
12V/600W
PRD1486
CLOSED LOOP FREQUENCY RESPONSE
A network analyzer (AP300) was used to test the bode plots of the system. A continuous noise signal of 150mV was injected
across the entire frequency range across a 15Ω resistor in series with the output voltage divider using an isolation transformer.
The operating condition was 400VDC input and a load condition of 600W with a soaking time of 45 minutes.
Figure 21 – Bode Plots, 400VDC input, 50A load,
Blue trace: Gain in dB
Red trace: Phase in degrees
Crossover frequency= 2.75KHz
Phase margin= 63.38°
Rev. 1.2 | Page 16 of 30
LLC resonant converter
12V/600W
PRD1486
EFFICIENCY
Figure 22 – Efficiency vs Load at 400VDC, 45 minutes soaking time
TRANSFORMER SPECIFICATION
PARAMETER
MIN
TYP
MAX
UNITS
NOTES
Core and Bobbin
PQ3230, Magnetics Inc
R Material or equivalent
Primary inductance
590
µH
Pins 2 to pin 4
Table 5 - Transformer specifications
6
1
2
2T, Copper
14T,
75 strands, 40AWG,
Litz wire
7,9
32T
2T, Copper
4
19
Figure 23 - Transformer electrical diagram
Rev. 1.2 | Page 17 of 30
LLC resonant converter
12V/600W
PRD1486
Figure 24 - Transformer construction diagram
Rev. 1.2 | Page 18 of 30
LLC resonant converter
12V/600W
PRD1486
APPENDIX I –SCHEMATICS (MAIN, AUX POWER, SR BOARD AND
DAUGHTER CARD)
Figure 25 – Schematic – Half Bridge LLC
Rev. 1.2 | Page 19 of 30
LLC resonant converter
12V/600W
PRD1486
Figure 26 – Schematic – Current sense & Oring FET
Rev. 1.2 | Page 20 of 30
LLC resonant converter
12V/600W
PRD1486
Figure 27 – Schematic – AUX power
Rev. 1.2 | Page 21 of 30
LLC resonant converter
12V/600W
PRD1486
Figure 28 – Schematic – SR & Thermal sense
Rev. 1.2 | Page 22 of 30
16
15
14
13
12
11
10
9
8
7
AC Sense Input
Primary Side Differential Current Sense Input
PWM Output for Primary Side Switch
PWM Output for Primary Side Switch
PWM Output for Primary Side Switch
PWM Output for Primary Side Switch
Auxiliary PWM Output
Power Supply On Input
Power Good Output (Open Drain)
Power Good Output (Open Drain)
Flag Input
Figure 29 – Schematic – ADP1046A daughter card
1
Analog Share Bus Feedback Pin
Share Bus Output Voltage
NOTES:
2
C26 = 330pF 50V X7R
VCORE
DNI
DNI
Low Side 4.99k 4.99k DNI
High Side 110k 110k DNI
DNI
33pF 33pF
DNI
C10 C13 C16 C17
R14, R15 = 2.2k 1%
R4
R33, R32 = 2.2k 1%
SHARE O/I
PGOOD1/2
R3
R19 = 10k 1%
ADD
1: R3, R4, R5, R6, R7, R8, R10, R11,R20 ARE 0.1% 25ppm
UNLESS OTHERWISE SPECIFIED.
2
3
SHARE0
SHAREi
SDA
SCL
RTD
FLAGIN
PGOOD2
PGOOD1
PSON
OUTAUX
OUTD
OUTC
OUTB
OUTA
CS1
ACSNS
SR1
SR2
CS2-
CS2+
VS1
VS2
GATE
VS3+
VS3-
+5V
+3.3V
Short trace from pin 25 DGND to pin 2 AGND
3
4
4
I2C Serial Clock Input
I2C Serial Data Input and Output
5
6
17
Synchronous Rectifier Output
Synchronous Rectifier Output
Thermistor Input
18
Inverting Differential Current Sense Input
Local Voltage Sense Input
19
22
OrFET Drain Sense Input
None Inverting Differential Current Sense Input
23
OrFET Gate Drive Output
20
24
None-Inverting Remote Voltage Sense Input
21
25
Power GND
26
Inverting Remote Voltage Sense Input
27
+12V
C18
DNI
R2
1k
R1
65
C10
100pF
ACSNS
C5
1.0uF
50V
DNI
D1
+12V
2
C17
R4
DNI 4.99k
CS2+
5
6
8
7
2
GND
NR
OUT1
OUT2
U2
ADP3303
SD
ERR
IN1
IN2
R6
1k
R5
46.4k
VS1
R3
4.99k
D2
1N4148
+5V
C13
100pF
C16
DNI
CS2-
4
3
1
2
C8
0.1uF
C2
DNI
C1
DNI
C4
DNI
C3
DNI
R11
1k
R21 5.1K
C15
1000pF
C12
4.7uF
+3.3V
CS1
R8
1k
R7
46.4k
VS2
R10
46.4k
D6
LED
RED
8
7
6
5
4
3
2
1
C14
0.1uF
VS3+
2
28
PGND
CS1
ACSNS
CS2+
CS2-
VS1
AGND
VS2
C9
DNI
C7
DNI
33
PAD
VS3-
2
10k
29
10
32
VS3+
SR1
9
SR1
31
VS3-
10k
11
3
RTD
28
3
C11
+3.3V
U1
ADP1046A
RTD
30 R20
RES
OUTA
PGND
OUTA
R13
0 Ohm
4
AGND DGND
SCL
SDA
PSON
FLAGIN
PGOOD2
PGOOD1
SHAREO
SHAREI
0.1uF
25
DGND
30
2
1
14
R29
2.2k
17
18
19
20
21
22
23
24
R33
2.2k
3
+3.3V
R24
2.2k
2.2k
C6
330pF
26
VCORE
29 R19
ADD
OUTB
12
OUTB
OUTC
13
OUTC
SR2
SR2
27
VDD
OUTD
OUTD
GATE
16
GATE
OUTAUX
15
OUTAUX
2.2k
R15
R32
Analog GND
2
1
Rev. 1.2 | Page 23 of 30
1
J1
SDA
SCL
+5V
R14
2.2k
+3.3V
4
3
2
1
SCL
SDA
PSON
J7
FLAGIN
PGOOD2
PGOOD1
SHARE0
SHAREi
LLC resonant converter
12V/600W
PRD1486
LLC resonant converter
12V/600W
PRD1486
APPENDIX IV – LAYOUT
Main Board
Figure 30 – Top side placement of components
Figure 2 – Bottom side placement of components
Rev. 1.2 | Page 24 of 30
LLC resonant converter
12V/600W
PRD1486
Figure 32 – Layout Layer 1
Figure 33 – Layout Layer 2
Rev. 1.2 | Page 25 of 30
LLC resonant converter
12V/600W
PRD1486
Figure 34 – Layout Layer 3
Figure 35 – Layout Layer 4
Rev. 1.2 | Page 26 of 30
LLC resonant converter
12V/600W
PRD1486
SR Board
Figure 36 – Top side placement of components
Figure 37 – Bottom side placement of components
Figure 38 – Layout Layer 1
Figure 39 – Layout Layer 2
Rev. 1.2 | Page 27 of 30
LLC resonant converter
12V/600W
PRD1486
Figure 40 – Layout Layer 3
Figure 41 – Layout Layer 4
Rev. 1.2 | Page 28 of 30
LLC resonant converter
12V/600W
PRD1486
NOTES
Rev. 1.2 | Page 29 of 30
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Rev. 1.2 | Page 30 of 30
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