R
EFERENCE
D
ESIGN
Overview
IRDCiP2001-A
International Rectifier
•
233 Kansas Street, El Segundo, CA 90245 USA
IRDCiP2001-A, 500kHz, 40A, 2-phase Synchronous Buck
Converter using iP2001
In this document, table 1 and figure 1 are provided to enable engineers to
easily evaluate the iP2001 in a 2-phase configuration that is capable of
providing up to 40A in a lab environment without airflow. Figures 3, 4, 5 and
6 and the complete bill of materials in table 2 are provided as a reference
design to enable engineers to very quickly and easily design a 2-phase
converter. In order to optimize this design to your specific requirements
refer to the data sheet for the controller listed in the bill of materials. 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 1.7V, but can be adjusted from 1.1 to 1.85V by setting
S1 according to the VID codes provided in Table 1. Droop control is set to 50mV at 40A, but can be adjusted by
following the instructions in the data sheet for the PWM controller.
The switching frequency per phase is set to 500kHz with the frequency set resistor R4. This creates an effective
output frequency of 1MHz. The graph in figure 1 shows the relationship between R4 and the switching frequency
per phase. This frequency may be adjusted by changing R4 according to this graph; however, extreme changes
from the 500kHz set point may require redesigning the control loop and adjusting the values of input and output
capacitors. Also, refer to the SOA graph in the iP2001 datasheet for maximum operating current at different
frequencies.
Procedure for Connecting and Powering Up Demoboard:
1. Apply input voltage (5-12V) across V
IN
(TP18) and PGND (TP15). Note that this input source must be applied first during
the power-up sequence.
2. Apply +5V logic power across +5V (TP19) and PGND (TP20).
3. Apply load across VOUT pads (TP11 & TP12) and PGND pads (TP15 & TP16)
4. Set ENABLE high.
5. Monitor switch node signals (optional) via TP7 & TP8.
6. Adjust load accordingly.
iP2001 Recommended Operating Conditions
(refer to the iP2001 datasheet for maximum operating conditions)
Input voltage:
5 - 12V
Output voltage:
1.1 - 1.85V
Output current:
20A per phase, 40A total for 2-phase demo board.
Switching Freq:
500kHz per phase, 1MHz effective output frequency.
07/19/02
IRDCiP2001-A
92%
f
SW
= 500kHz
90%
88%
86%
V
IN
= 12V
V
OUT
= 1.6V
T
A
= 25°C
f
SW
= 1MHz
84%
82%
80%
0
5
10
15
20
25
30
35
40
Output Current (A)
Figure 2 - Typical Efficiency vs. Current
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 BGA Packages
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.
www.irf.com
Efficiency
3
嵌入式系统
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