IRDCIP2002-C [INFINEON]
1MHz, 120A, 4-phase Synchronous Buck Converter using iP2002; 为1MHz ， 120A ， 4相同步降压转换器使用iP2002
| 型号： | IRDCIP2002-C |
| 厂家： | 
Infineon |
| 描述： | 1MHz, 120A, 4-phase Synchronous Buck Converter using iP2002 |
| 文件： | 总7页 (文件大小：1671K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
IRDCiP2002-C
R
EFERENCE
D
ESIGN
International Rectifier 233 Kansas Street, El Segundo, CA 90245 USA
•
IRDCiP2002-C: 1MHz, 120A, 4-phase Synchronous Buck
Converter using iP2002
Overview
This reference design is capable of delivering up to 120A at an
ambient temperature of 45°C if the enclosed heatsink is attached
and 250LFM of airflow is provided. Performance graphs and
waveforms are provided in figures 1 - 9. The figures and table in
pages 4 - 7 are provided as a reference design to enable engineers
to very quickly and easily design a 4-phase converter. Refer to the
data sheet for the controller listed in the bill of materials in order to
optimize this design to your specific requirements. A variety of other
controllers may also be used, but the design will require layout and
control circuit modifications.
Demoboard Quick Start Guide
Initial Settings:
The output is set to 1.3V, but can be adjusted from 0.8V to 3.3V by changing the values of R3 and R32 according to
the following formula:
R3 = R32 = (24.91k * 0.8) / (VOUT - 0.8)
The switching frequency per phase is set to 1MHz with the frequency set resistor R4. This creates an effective output
frequency of 4MHz. The graph in figure 11 shows the relationship between R4 and the switching frequency per phase.
The frequency may be adjusted by changing R4 as indicated; however, extreme changes from the 1MHz set point may
require redesigning the control loop and adjusting the values of input and output capacitors. Refer to the SOA graph in
the iP2002 datasheet for maximum operating current at different conditions.
Procedure for Connecting and Powering Up Demoboard:
1. Apply input voltage (+12V) across VIN and PGND
2. Apply load across VOUT pads and PGND pads
3. Adjust load to desired level. See recommendations below.
iP2002 Recommended Operating Conditions
(refer to the iP2002 datasheet for maximum operating conditions)
Input voltage:
6.5 - 12V
Output voltage:
Switching Freq:
Output current:
0.8 - 3.3V
1MHz per phase, 4MHz effective output frequency.
The reference design is capable of delivering up to 120A at an ambient temperature of 45°C if the
enclosed heatsink is attached and 250LFM of airflow is provided. With a heatsink and no airflow, the
reference board is capable of delivering 110A at 25°C ambient. With 250LFM and no heatsink, the
reference board is capable of delivering 100A at 25°C ambient.
07/22/03
IRDCiP2002-C
35
87%
86%
85%
84%
83%
82%
81%
80%
79%
30
25
20
15
10
5
VIN = 12V
V
OUT = 1.3V
f
SW = 1MHz
T
A = 25ºC
VIN = 12V
VOUT = 1.3V
fSW = 1MHz
TA = 25ºC
0
0
10
20
30
40
50
60
70
80
90
100
110
120
0
10
20
30
40
50
60
70
80
90
100
110
120
Output Current (A)
Output Current (A)
Fig. 1: Power Loss vs. Current
Fig. 2: Efficiency vs. Current
Phase Margin = 59°
Cross-Over Freq = 123kHz
VIN = 12V
V
OUT = 1.3V
I
OUT = 120A
f
SW = 1MHz
TA = 21ºC
Fig. 3: Bode Plot
VIN = 12V
VIN = 12V
V
OUT = 1.3V
V
OUT = 1.3V
IOUT = 120A
fSW = 1MHz
TA = 25ºC
I
OUT = 120A
fSW = 1MHz
TA = 25ºC
Ripple = 12.8mVp-p
Ripple = 132mVp-p
Fig: 4: Input Voltage Ripple Waveform
Fig. 5: Output Voltage Ripple Waveform
2
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IRDCiP2002-C
101.2%
101.1%
101.0%
100.9%
100.8%
100.7%
100.6%
100.5%
100.4%
100.3%
100.2%
100.1%
100.0%
99.9%
VIN = 12V
VOUT = 1.3V
IOUT = 120A
fSW = 1MHz
TA = 25ºC
99.8%
0
10
20
30
40
50
60
70
80
90
100
110
120
Output Current (A)
Fig. 6: Output Voltage Accuracy vs. Current
Ch1: VIN
5V/div
Ch1: VIN
2V/div
VIN = 12V
VIN = 12V
VOUT = 1.3V
VOUT = 1.3V
Ch2: VOUT
0.5V/div
Ch2: VOUT
0.2V/div
IOUT = 40A
IOUT = 120A
fSW = 1MHz
TA = 25ºC
fSW = 1MHz
TA = 25°C
Fig. 7: Power Up Waveform
Fig. 8: Power Down Waveform
Ch2: VOUT
0.5V/div
Short
circuit at
start-up
Hiccups
until short
circuit is
removed
VIN = 12V
VOUT = 1.3V
f
SW = 1MHz
TA = 25ºC
Ch4: IOUT
100A/div
Fig 9: Short Circiut Condition Waveform
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3
IRDCiP2002-C
Adjusting the Over-Current Limit
R5, R7, R8 & R9 are the resistors used to adjust the over-current trip point. The trip point is a function of the controller and
corresponds to the per phase output current indicated on the x-axis of Fig. 10. For example, selecting 2.7k resistors will
set the trip point of each phase to 49.5A. (Note: Fig. 10 is based on iP2002 TBLK = 125°C. The trip point will be higher than
expected if the reference board is cool and is being used for short circuit testing.)
2.8
2.7
2.6
2.5
2.4
2.3
2.2
2.1
2.0
1.9
1.8
1.7
32
34
36
38
40
42
44
46
48
50
Over-Current Trip Point (per Phase)
Fig. 10: RISEN vs. Current (per Phase)
100
90
80
70
60
50
40
30
20
10
300
400
500
600
700
800
900
1000
Output Frequency (kHz) (per Phase)
Fig. 11: R4 vs. Frequency (per Phase)
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IRDCiP2002-C
Fig. 12: Component Placement Top Layer
127mm
17mm
5mm
1.5mm
20mm
3mm
Heatsink Notes:
1)Always use the supplied Bergquist Gap PadTM A2000 thermal interface material with heatsink.
2) Torque 4 x #2-56 machine screws to 15 ±1 in-oz.
3) The heatsink is optimized for 250 LFM with unconfined airflow. Performance will improve with
more airflow or confined airflow.
4) Airflow direction should be parallel to fins for maximum performance.
Fig. 13: Heatsink Specificationss
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5
IRDCiP2002-C
P
M C O
3
4
5
O O D P R
F B
d n j / d G A
1
Fig. 14: Reference Design Schematic
6
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IRDCiP2002-C
Quantity
1
Designator
Type 1
capacitor
Type 2
NPO
Value 1
560pF
Value 2
50V
Tolerance
5%
Package
0805
Manufac 1
ROHM
C1
C10, C11, C12, C13, C14, C27, C3, C4, C46,
C5, C6, C7, C8, C9
14
capacitor
X5R
10.0uF
16V
10%
1206
Murata
8
2
1
1
C15, C16, C17, C18, C19, C20, C21, C22
capacitor
capacitor
capacitor
capacitor
X5R
X5R
NPO
NPO
100uF
10.0uF
15.0pF
220pF
6.3V
6.3V
50V
50V
20%
10%
5%
1210
1206
0805
0805
TDK
TDK
ROHM
Phicomp
C2, C28
C25
C26
5%
C30, C31, C32, C33, C42, C43, C44, C45, C47,
R22, R24, R26, R28, R29, R30, R36, SHORT,
SHORT1,
31
open
-
-
-
-
-
-
1
4
3
2
4
4
2
4
8
2
2
1
4
1
8
4
8
1
4
1
C34
capacitor
capacitor
capacitor
diode
X7R
X5R
polymer
general purpose
hexnut
ferrite
thick film
thick film
thick film
thick film
thick film
thick film
thick film
thick film
hexnut
stand off
0.100uF
0.22uF
330uF
200V
4-40
0.30uH
20.0K
0
10.0K
24.9K
40.2K
20
2.74K
499
10-24
4-40
10-24
4.5 - 5.5V
5 - 12V
5.0V
50V
6.3V
16V
600mA
-
10%
10%
20%
-
0805
0603
SMD
sot23
-
SMT
0805
0805
0603
0805
0805
0805
0805
0805
-
ROHM
TDK
C35, C36, C37, C38
C39, C40, C41
D1, D2
HN1, HN2, HN3, HN4
Panasonic
Central semiconductor
Building Fasteners
Panasonic
KOA
ROHM
KOA
KOA
KOA
KOA
KOA
KOA
McMaster Carr
Keystone
McMaster Carr
Intersil
hardware
inductor
resistor
resistor
resistor
resistor
resistor
resistor
resistor
resistor
hardware
hardware
hardware
ISL6558
iP2002
-
L1, L2, L3, L4
R1, R4
R10, R11, R12, R13
R16, R17, R18, R19, R21, R23, R25, R27
36A
20%
1%
<50m
1%
1%
1%
1%
1%
1%
-
1/8W
1/8W
1/10W
1/8W
1/8W
1/8W
1/8W
1/8W
-
2
3/4
0.8 - 5V
30A
800mA
R2, R31
R3, R32
R35
R5, R7, R8, R9
R6
SC1, SC2, SC3, SC4, SC5, SC6, SC7, SC8
ST1, ST2, ST3, ST4
TC1, TC2, TC3, TC4, TC5, TC6, TC7, TC8
-
-
-
-
alumininum
-
16 Ld SOIC
11mm x 11mm
TO-252
machine screw
PWM controller
BGA unit
LDO linear regulator
U1
U2, U3, U4, U5
U6
International Rectifier
National Semiconductor
LM1117
-
Table 1: Reference Design Bill of Materials
Refer to the following application notes for detailed guidelines and suggestions when
implementing iPOWIR Technology products:
AN-1028: Recommended Design, Integration and Rework Guidelines for International Rectifier’s
iPOWIR Technology BGAPackages
This paper discusses the assembly considerations that need to be taken when mounting iPOWIR BGA’s
on printed circuit boards. This includes soldering, pick and place, reflow, inspection, cleaning and
reworking recommendations.
AN-1029: Optimizing a PCB Layout for an iPOWIR Technology Design
This paper describes how to optimize the PCB layout design for both thermal and electrical performance.
This includes placement, routing, and via interconnect suggestions.
AN-1030:Applying iPOWIR Products in Your Thermal Environment
This paper explains how to use the Power Loss and SOA curves in the data sheet to validate if the
operating conditions and thermal environment are within the Safe Operating Area of the iPOWIR product.
AN-1047: Graphical solution for two branch heatsinking Safe Operating Area
Detailed explanation of the dual axis SOA graph and how it is derived.
Use of this design for any application should be fully verified by the customer. International
Rectifier cannot guarantee suitability for your applications, and is not liable for any result of
usage for such applications including, without limitation, personal or property damage or
violation of third party intellectual property rights.
IR WORLD HEADQUARTERS: 233 Kansas St., El Segundo, California 90245, USA Tel: (310) 252-7105
TAC Fax: (310) 252-7903
www.irf.com
7
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