International Rectifier IRDC38063-P1V2 User manual

IRDC38063-P1V2
3/21/2017 1
USER GUIDE FOR IR38063 EVALUATION BOARD
DESCRIPTION
The IR38063 is a synchronous buck
converter with a PMBus interface, providing
a compact, high performance and flexible
solution in a small 5mmx7mm PQFN
package.
Key features offered by the IR38063 include
I2C/PMBus configurability of output voltage,
soft-start, input UVLO, input overvoltage
protection, output overvoltage protection,
output overcurrent protection, Power Good,
thermal protection and switching frequency.
Additionally, the IR38063 also features
enhanced line/ load regulation with feed
forward, external frequency synchronization
with smooth clocking, internal LDO, true
differential remote sensing and pre-bias
start-up.
A temperature and bias compensated output
over-current protection function is implemented
by sensing the voltage developed across the
on-resistance of the synchronous rectifier
MOSFET for optimum cost and performance.
This user guide contains the schematic and bill
of materials for the IR38063 evaluation board.
The guide describes operation and use of the
evaluation board itself. Detailed application
information for IR38063 is available in the
IR38063 data sheet.
BOARD FEATURES
•PVin = +12V (+ 13.2V Max), No Vcc required.
•Vout = +1.2V @ 0-25A
•Fs=600kHz
•L= 0.215uH
•Cin= 4x22uF (ceramic 1206) + 1x330uF (electrolytic, optional)
•Cout=7x47uF (ceramic 0805)
SupIRBuckTM

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A well regulated +12V input supply should be connected to PVin+ and PVin-. A maximum of 25A load should
be connected to VOUT+ and VOUT-. The inputs and output connections of the board are listed in Table I.
IR38063 needs only one input supply and internal LDO generates Vcc from PVin. Another internal LDo
generates the 1.8V needed by the internal digital circuits. If operation with external Vcc is required, then R25
should be removed and external Vcc can be applied between Vcc+ and Vcc- pins. Vin pin and Vcc pins
should be shorted together for external Vcc operation by installing R24. For tracking operation R27 should
be populated with a 0 ohm resistor. For normal, non-tracking operation, R27 should not be populated
and a 100 kOhm resistor should be connected from the Track_En pin to P1V8.
The board is configured for remote sensing. If local sense is desired, R8 should be uninstalled and R16
should be installed instead.
I2C/PMBus communication is established through the 4 pin header which allows connection to the
SCL/SDA/SALERT and GND lines from the host/dongle. For proper operation in digital communications
mode, R35 must always be populated.
External Enable signal can be applied to the board via exposed Enable pad and R18 should be removed for
this purpose.
CONNECTIONS and OPERATING INSTRUCTIONS
LAYOUT
The PCB is a 6-layer board. All of layers are 2 Oz. copper. The IR38063 and most of the passive
components are mounted on the top side of the board. Power supply decoupling capacitors and
feedback components are located close to IR38063. The feedback resistors are connected to the
output of the remote sense amplifier of the IR38063 and are located close to the IR38063. To improve
efficiency, the circuit board is designed to minimize the length of the on-board power ground current
path. Separate power ground and analog ground are used and may be connected together using a 0
ohm resistor.
Table I. Connections
Connection Signal Name
PVin+ PVin (+12V)
PVin- Ground of PVin
Vout+ Vout(+1.2V)
Vout- Ground for Vout
Vcc+ Vcc Pin
Vcc- Ground for Vcc input
Enable Enable
PGood Power Good Signal

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CONNECTION DIAGRAM
Top View
Bottom View
Vout
PVin
PGood
Enable I2C / PMBus
Communication

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Fig. 1: Schematic of the IR38063 evaluation board
Single point of connection between Power Ground and Signal ( “analog” ) Ground
R60 is not present in evaluation boards older than Revision C
R29N/S
U1
IR38063
Vin 21
LGnd
13
Rt/Sync
14
Vcc 22
Comp
7
Vsns 5
PGnd 12
SCL/OCSet
19
FB
6
Boot 2
PGood 11
PVin 1
RS-
9
RS+ 10
RSo
8
SW 24
3Track_En
Vp 4
En/FCCM 15
SDA/IMON
18
SAlert/TMON
17
ADDR
16
P1V8
20
NC1
23
NC2
26
R30 N/S
R25 0
R31 4.99K
En/FCCM
1
R8
20
SDA/IMON
VDDQ
GND
SAlert/TMON
SDA
SDA/IMON
CLK DATA
J1
R40
0
R36
50
SCL
VIN
R27
N/S
Vcc
R24 N/S
SCL/OC
C35 1uF
VCC+
1
VCC
VIN
1
Vsns
VIN
Vsense
1
VCC
C80
10uF
BODE2 12
PGood
1
R23 4.99K
R51 0 ohm
R52 0 ohm
Vout_+
1
Vout_-
1
BODE1 12
R39
0
ALERT#
VCC-
1
R18
49.9K
R19
7.5K
C38 N/S
C28
N/S
C40 N/S
C39 N/S
R22 0 ohm
R29 and R30 are unpopulated because our USB/I2C converter dongle has on-board pullups.
R26
0 ohm
PGND
1
C32 22uF
C29 22uF C31
22uF
C30 22uF C37
N/S
C10
0.1uF
+C1
330uF PVin-
123456
C36 0.1uF C34
N/S
C33 N/S
Vout-
123456
PVin+
123456
Vout+
123456
VCC
IMON 1R33
N/S
TMON 1
SAlert/TMON
R34
N/S SCL/OC
PVin
Sync
Rt/Sy nc
Sync
1
R9
3.83K
R28 N/S
Track_Enb
1
C61 N/S
C62 N/S
C53
0.1uF
L1
215 nH PCDC1008-R215EMO
R35
0
C54
N/S
R10
0
Fb
C67
N/S
C59 N/S
C60 N/S
C57 N/S
C58 N/S
R38
N/S
C56 N/S
C55 N/S
SWs
1
SW
R16
N/S
R4
182
R2 5.62K
C52 N/S
Vsns
R6
20
C51 N/S
C50 N/S
R58
N/S
C49 47uF
+C76
N/S
C48 47uF
1.8V
1
C47 47uF
Vsns
7X47uF/805/6.3V
R15 N/S
+C77
N/S
+C65
N/S
R41
0
+C66
N/S
C46
47uF
C8
2200pF
R14
0
C45
47uF
R11
0
R32
N/S
C44 47uF
C43 47uF
Vo_R_P
R37
0
Vo_R_N
C42
0.1uF
ADDR
Rt/Sy nc
C41
2.2uF
Vp
1
R60
100K
R20 N/S R21
N/S
R3
N/S
ADDR
ADDR
1
LGnd
1
Vout
C26
22nF
R1
1.21K
C11
390pF
R59
N/S
C27 N/S
1
VDDQ
1

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Schematic for Transient Load set up
Vout
S3 should be in position
1-2 to enable transient load
R50
20m
C75
N/S
C71
N/S
C70
N/S C76
N/S
C68
10u
R42
0.2
R43
0.2
R44
0.2
R46
0.2
R47
1.5K
ExtLoadCtrl
1
M1
IRF6721
U2
MIC4452/SO8
VS
1
IN
2
GND
4GND 5
OUT1 6
OUT2 7
VS 8
N/A
3
R45
N/S
R49
10K
S1
SW
2 1
3
C69
0.1uF
C78
0.1uF
R48
10K
Vout
C79
100p
C77
N/S
Vo_R_P
Vo_R_N
VCC
I-Monitor
1
C72
N/S C73 N/S C74 N/S
KC10
KC20
Vout

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Bill of Materials
•The electrolytic input capacitor used on this demo board is to eliminate the impact of the parasitic inductance of a long input power cable. It may not
be necessarily needed in real applications.
Item
Number Quantit y Part Reference Value Description Manufacturer Part Number
1 1C1 330uF SMD Electrolytic, F size, 25V, 20% Panasonic EEE-FK1E331P
2 1C8 2200pF 2200pF, 0603, 50V, NPO TDK C1608C0G1H222J
3 1C79 100 pF 50V, 0603, NP0, 5% Murata GRM1885C1H101JA01D
4 1C11 390 pF 50V, 0603, NP0, 5% Murata GRM1885C1H391JA01D
5 1C26 22nF 0603,50V,X7R Murata GRM188R71H223KA01D
6 4C29 C30 C31 C32 22uF 22uF,1206, 25V, X5R, 20% TDK C3216X5R1E226M160AB
7 6C10 C36 C42 C53 C69 C78 0.1uF 0603, 50V, X7R, 10% Panasonic ECJ-1VB1H104K
8 1C35 1uF 0603, X5R, 25V, 20% TDK C1608X5R1E105M
9 7C43 C44 C45 C46 C47 C48 C49 47uF 0805, 6.3V, X5R, 20% TDK C2012X5R0J476M125AC
10 18
EXTLOADCTRL EN/FCCM
I-MONITOR IMON PGND
PGOOD SW SYNC TMON
VCC+ VCC- VDDQ VIN
VIN_+ VOUT_+ VOUT_- VP
VSENSE
0.075"
SQ_SMT_Te
stPoint
Keystone Electronics 5000 and 5006
11 1J1 (CLK, Data,GND, Alert) Header-4P 4x1
12 1Bode1 Header-2P 2x1
13 1C41 2.2uF 0603, 10V, X5R TDK C1608X5R1A225M080AC
14 1C68 10uF 0805, 10V, X5R TDK C2012X5R1A106M125AB
15 1C80 10uF 0603, 10V, X5R, 20% Murata GRM188R61A106ME69D
16 1R19 7.5k 0603,1/10W,1% Rohm MCR03EZPFX7501
17 1L1 215nH 0.215uH, DCR=0.29mohm Cyntec PCDC1008-R215EMO
18 1M1 IRF6721 Direct Fet 30V SQ International Rectifier IRF6721STRPbF
19 1R1 1.21k 0603,1/10W,1% Rohm MCR03EZPFX1211
20 1R2 5.62k 0603,1/10W,1% Rohm MCR03EZPFX5621
21 1R9 66.5k 0603,1/10W,1% Rohm MCR03EZPFX6652
22 1R4 182 0603,1/10W,1% Rohm MCR03EZPFX1820
23 1R6 20 0603,1/10W,1% Rohm CRCW060320R0FKEA
24 11R8 R10 R11 R14 R25 R35 R36 R37 R39 R40 R41 0 ohm 0603,1/10W Rohm CRCW06030000Z0EA
25 1R18 49.9k 0603,1/10W,1% Rohm MCR03EZPFX4992
26 4R22 R26 R51 R52 0 ohm 1206,1/4 W Panasonic ERJ-8GEY0R00V
27 4R42 R43 R44 R46 0.2 ohm 0805,1/8W, 5% CTS 73L3R20J
28 1R47 1.5k 0603,1/10W,1% Rohm MCR03EZPFX1501
29 2R48 R49 10k 0603,1/10W,1% Rohm MCR03EZPFX1002
30 1R50 20 mohm 1206,1/2W,1% Ohmite LVK12R020FER
31 2 R23 R31 4.99k 0603,1/10W,1% Rohm MCR03EZPFX4991
32 1U2 MIC4452/SO 8 Mosfet driver Non-inverting SO-8 Micrel MIC4452YM
33 1U1 IR38063 IR38063 5mm X 7mm International Rectifier IR38063
34 2 Pvin+, Vout+ Connector Red Screw Terminal 30A Keystone Electronics 8199-2
35 2 Pvin-, Vout- Connector Black Screw Terminal 30A Keystone Electronics 8199-3

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TYPICAL OPERATING WAVEFORMS
PVin=12.0V, Vout=1.2V, Iout=0A-25A, Fs=600kHz, Room Temperature, no airflow
Fig. 5: Operation 00, Immediate OFF, 25A load
Ch1:PVin, Ch2:Vout, Ch3:PGood, Ch4:Enable
Fig. 6: Inductor node at 25A load
Ch3:SW node
Fig. 3: PVin Start up at 25A Load
Ch1:PVin, Ch2:Vout, Ch3:PGood,Ch4:Vcc
Fig. 2: PVin Start up at 25A Load
Ch1:PVin, Ch2:Vout, Ch3:PGood, Ch4:Enable
Fig. 4: Operation 80,Turn ON without margining, 25A load
Ch1:PVin, Ch2:Vout, Ch3:PGood, Ch4:Enable
Fig. 7: Output voltage ripple at 25A load
Ch2:Vout

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Fig. 9: Short-circuit recovery (Hiccup) at 25A load
Ch2:Vout, Ch3:PGood
Fig. 8: 0.35V Prebias voltage startup at 0A load
Ch2:Vout, Ch3:PGood
TYPICAL OPERATING WAVEFORMS
PVin=12.0V, Vout=1.2V, Iout=0A-25A, Fs=600kHz, Room Temperature, no airflow

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Fig. 10: Transient Response, 2.5A to 10A step (2.5A/us)
Ch1:Vout, Ch4:Iout
Fig. 11: Transient Response, 17.5A to 25A step (2.5A/us)
Ch1:Vout, Ch4:Iout
TYPICAL OPERATING WAVEFORMS
PVin=12.0V, Vout=1.2V, Iout=0A-25A, Fs=600kHz, Room Temperature, no airflow

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Fig. 12: Bode Plot at 0A load
Bandwidth = 83.3kHz, Phase Margin = 56.3o, Gain Margin = 10.8dB
Fig. 13: Bode Plot at 25A load
Bandwidth = 78.7kHz, Phase Margin = 50.8o, Gain Margin = 11.3dB
TYPICAL OPERATING WAVEFORMS
PVin=12.0V, Vout=1.2V, Iout=0A-25A, Fs=600kHz, Room Temperature, no airflow
12
-60
-40
-20
0
20
40
60
-200
-150
-100
-50
0
50
100
150
200
103104105
TR1/dB
TR2/°
f/Hz
TR1: Mag(Gain) TR2: Unwrapped Phase(Gain)
12
-60
-40
-20
0
20
40
60
-200
-150
-100
-50
0
50
100
150
200
103104105
TR1/dB
TR2/°
f/Hz
TR1: Mag(Gain) TR2: Unwrapped Phase(Gain)

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Fig15: Power loss versus load current
Fig.14: Efficiency versus load current
TYPICAL OPERATING WAVEFORMS
PVin=12.0V, Vout=1.2V, Iout=0A-25A, Fs=600kHz, Room Temperature, no airflow

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Fig. 16: Thermal Image of the board at 25A load
IR38063: 72.9oC, inductor: 58.4oC, Ambient:26.5oC
THERMAL IMAGE
PVin=12.0V, Vout=1.2V, Iout=0A-25A, Fs=600kHz, Room Temperature, no airflow

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Fig. 17: PMBus Command Summary
PMBus Command Summary
PVin=12.0V, Vout=1.2V, Iout=0A-25A, Fs=600kHz,

IRDC38063-P1V2
Quick Start: PowIRCenter GUI
Connecting devices
14
Start PowIRCenter &
Connect USB Dongle
Step 1
Step 2 Detect attached demoboards
USB Dongle connected
USB Dongle NOT detected
Press “Auto Populate Devices” button to
detect boards connected to USB dongle

IRDC38063-P1V2
15
Step 3 Access different views
Click device name to
access save / load
configuration files
menu.
Access Board View
Click Total Pout to
return to the Board View
Access PMBus commands
Click channel to
access PMBus
commands for
selected channel
Access Config File Menu
Quick Start: PowIRCenter GUI
Navigation: Accessing Different Views

IRDC38063-P1V2
16
Click the command
in right panel. Enable / Disable Channel
(Command: OPERATION)
Change Vout
(Command: VOUT_COMMAND)
1. Enter Vout voltage.
2. Press enter after entering value.
3. Click “Write” button to send the command.
1. Ensure the channel enable is set high on
board.
2. Click “On” or “Immediate Off” to turn on or
off the channel.
3. Click “Write” button to send the command.
PMBus Command Screen
*
*
Select command
from pull down List
Select Command for Selected Channel
or
*
Click to sort the PMBus commands by name
Click to sort PMBus commands by operation code
View Basic or All PMBus Commands
Quick Start: PowIRCenter GUI
PMBus Commands