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3PHASEPWMのメーカーはInternational Rectifierです、この部品の機能は「3-Phase Synchronous PWM Controller IC Provides an Integrated Solution for Intel VRM 9.0 Design Guidelines」です。


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部品番号 3PHASEPWM
部品説明 3-Phase Synchronous PWM Controller IC Provides an Integrated Solution for Intel VRM 9.0 Design Guidelines
メーカ International Rectifier
ロゴ International Rectifier ロゴ 




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3PHASEPWM Datasheet, 3PHASEPWM PDF,ピン配置, 機能
3-Phase Synchronous PWM Controller IC Provides an
Integrated Solution for Intel VRM 9.0 Design Guidelines
Odile Ronat
International Rectifier
The fundamental reason for the rapid change and
growth in information technology power
requirements is the increase in volume of data
processed, stored, transmitted, and displayed. As
a result, power requirements have grown very
rapidly. To control the increase in power
dissipation, operating voltages have been
reduced. Power scales as the square of the
voltage: cut the voltage in half, and the power
dissipation is reduced to one fourth. As circuit
output voltages approach the one-volt mark,
operating currents are increasing exponentially.
Today, feeding this much “ultraclean” current at
these low voltages with tremendous transient
response capability is the key technology driver
of power management for IT.
CPUs used in servers, advance desktop
computers and motherboards such as the Intel
Pentium™ 4 or Xeon™ or AMD K7™ typically
require currents up to 60A at output voltages
around 1V, with transient response in the order
of 50A/us. Designers prefer a multiphase DC-
DC converter topology to address the higher
current requirements and faster transient
response problem,
This article will discuss the specific
requirements for DC-DC converters required to
power today’s GHz class CPUs, the benefits of
the multiphase topology, and an example of
implementation of Intel VRM 9.0 using an
integrated 3-phase synchronous PWM controller
IC.
An Overview of Intel VRM 9.0 Design
Guidelines
With today’s microprocessor voltage below 2V,
they cannot be powered directly out of the
conventional silver box that typically provides
5V and 12V. Located in proximity to the CPU,
the voltage regulator module (VRM) delivers
regulated, stepped down voltage to the CPU.
The Intel VRM 9.0 definition is specifically
intended to meet the needs of systems based on
the Intel ® Xeon™ and Pentium ® 4 processors.
Table 1 provides a summary of the output
requirements for VRM 9.0.
Table 1 - Summary of the VRM 9.0 output requirements (Source: Intel VRM9.0 DC-DC converter design guidelines.
Other requirements include VID voltage
identification and Power Good feedback. The
VRM must accept five lines to set the nominal
maximum voltage. Five processor package pins
will have a high-low pattern corresponding to
the voltage required by the individual processor.
The VRM should provide an open collector
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3PHASEPWM pdf, ピン配列
Figure 1 – Typical application of IRU3055
The IRU3055 has on-board MOSFET drivers,
making it cost-effective compared to the
majority of multiphase controllers, which
require external MOSFET drivers. When used
with IR’s HEXFET® power MOSFETs like the
IRF3704S in the control FET socket and the
IRF3711S in the synchronous FET socket, the
IRU3055 can provide up to 60A for
microprocessor VCORE requirements at 80%
efficiency or above.
The new controller IC is a fixed-frequency
voltage mode controller with 50kHz to 500kHz
programmable operating frequency by using an
external resistor. The output voltage is selectable
in 25mV steps from 1.075 to 1.85V with up to
1.5% output voltage accuracy using a
programmable VID code to the five-bit digital-
to-analog converter (DAC).
The new device has a number of features to
provide protection and monitoring for the power
system and the microprocessor. It features
under-voltage lockout (UVLO) for the 5V and
12V supplies as well as an externally
programmable soft-start function. Another
feature is the PGOOD monitor circuit, which is
held low if the output of the converter is not
within ±10% of the programmed voltage.
The IRU3055 also provides over-voltage
protection. If the output voltage exceeds the
DAC-programmed voltage by 20%, the low-side
MOSFETs turn on and shunt the output voltage
to ground, protecting the CPU from damage.
The IRU3055 features loss-less inductor current
sensing and sharing while over-current
protection is achieved by synchronous FET
RDS(on) sensing, eliminating the need for a
separate sense resistor. The IRU3055 can also be
easily configured for voltage droop
compensation so that the output voltage will
linearly decrease as load current increases and
vice versa, as required by Intel VRM design
guidelines.
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部品番号部品説明メーカ
3PHASEPWM

3-Phase Synchronous PWM Controller IC Provides an Integrated Solution for Intel VRM 9.0 Design Guidelines

International Rectifier
International Rectifier


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