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參數(shù)資料
| 型號： | 3PHASEPWM |
| 廠商： | International Rectifier |
| 英文描述： | 3-Phase Synchronous PWM Controller IC Provides an Integrated Solution for Intel VRM 9.0 Design Guidelines |
| 中文描述： | 3相同步PWM控制器芯片提供了一個集成解決方案英特爾VRM電源設(shè)計指南9.0 |
| 文件頁數(shù)： | 5/5頁 |
| 文件大?。?/td> | 501K |
| 代理商： | 3PHASEPWM |
5
Figure 4
- Normalized output current across output
capacitor, as a function of duty cycle, (Peak to peak
current normalized to the Vo/(L3Fs) at zero duty
cycle).
It is shown that the output current ripple is
greatly reduced by multi-phase operation. At the
certain duty cycle D=1/N, where N is the phase
number, the output ripple will be near zero due
to complete cancellation of inductor current
ripple. The optimum number of phases exists for
different applications.
Built-in Synchronous-Rectifier Driver
Synchronous rectification reduces conduction
losses in the rectifier by shunting the normal
Schottky diode with a low on-resistance
MOSFET switch. The synchronous rectification
also ensures good transient dynamic. The 3-
phase synchronous rectifier MOSFET drivers
are built inside the IRU3055.
Transient Response
The IRU3055 delivers transient response that
meets Intel VRM 9.0 design guidelines with no
oscillation and a voltage drop <100mV for a
60A step load.
Figure 5
- 3-phase inductor current and Vout at 60A
dynamic load response
Conclusion
With the development of new microprocessors
always requiring more power, voltage are
dropping to reduce power dissipation, driving
currents upward exponentially. Higher currents
also
lead
to
faster
requirements and higher switching frequencies.
Multiphase topology is the preferred topology to
address
the
functionality
microprocessors voltage regulation requirements
in a compact footprint at an acceptable cost. 3-
phase converters appear to be the preferred way
of economically meeting the design guidelines
for Intel VRM9.0. The IRU3055 3-phase
synchronous PWM controller IC provides an
integrated
solution
for
implementation of Intel VRM 9.0.
As next generation processors emerge with more
stringent power supply requirements and
additional functionality, new approaches and
advances in technology will be needed. More
phases might be needed to meet the ever-
increasing currents. With more phases come
more design complexity, power dissipation and
response
delay.
The
functionalities within voltage regulators will
need to be optimized to provide the best
performance at the best cost in compact
footprints.
transient
response
of
today’s
a
straightforward
partitioning
of
Drop <100mV
Inductor Current
in each phase
rises
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