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| 型号： | NCP1652L48VGEVB |
| 厂商： | ON Semiconductor |
| 文件页数： | 19/34页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL 100W 48V NCP1652 PFC |
| 产品变化通告： | 1Q2012 Discontinuation 30/Mar/2012 |
| 标准包装： | 1 |
| 系列： | * |
| 其它名称： | NCP1652L48VGEVB-ND NCP1652L48VGEVBOS |
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NCP1652, NCP1652A
DETAILED DEVICE DESCRIPTION
Introduction
The NCP1652 is a highly integrated controller combining
PFC and an isolated step down ac ? dc power conversion in
a single stage, resulting in a lower cost and reduced part
count solution. This controller is ideal for notebook
adapters, battery chargers and other off ? line applications
with power requirements between 75 W and 150 W with an
output voltage greater than 12 V. The single stage is based
on the flyback converter and it is designed to operate in CCM
designer familiarity and a vast range of available
components. But, because it processes the power twice, the
search is always on for a more compact and power efficient
solution.
The NCP1652 controller offers the convenience of
shrinking the front ? end converter (PFC preregulator) and
the dc ? dc converter into a single power processing stage as
shown in Figure 52.
or DCM modes.
Power Factor Correction (PFC) Introduction
Power factor correction shapes the input current of
AC
Input
Rectifier
&
Filter
NCP1652 Based
Single ? Stage
Flyback Converter
V out
off ? line power supplies to maximize the real power
AC
PFC
Input
Preregulator
V out
available from the mains. Ideally, the electrical appliance
should present a load that emulates a pure resistor, in which
case the reactive power drawn by the device is zero. Inherent
in this scenario is the freedom from input current harmonics.
The current is a perfect replica of the input voltage (usually
a sine wave) and is exactly in phase with it. In this case the
current drawn from the mains is at a minimum for the real
power required to perform the needed work, and this
minimizes losses and costs associated not only with the
distribution of the power, but also with the generation of the
power and the capital equipment involved in the process.
The freedom from harmonics also minimizes interference
with other devices being powered from the same source.
Another reason to employ PFC in many of today’s power
supplies is to comply with regulatory requirements. Today,
electrical equipment in Europe must comply with the
European Norm EN61000 ? 3 ? 2. This requirement applies to
most electrical appliances with input power of 75 W or
greater, and it specifies the maximum amplitude of
line ? frequency harmonics up to and including the 39 th
harmonic. While this requirement is not yet in place in the
US, power supply manufacturers attempting to sell products
worldwide are designing for compliance with this
requirement.
Typical Power Supply with PFC
A typical power supply consists of a boost PFC
preregulator creating an intermediate X 400 V bus and an
isolated dc ? dc converter producing the desired output
voltage as shown in Figure 51. This architecture has two
power stages.
Rectifier DC ? DC
& Converter
Filter with isolator
Figure 51. Typical Two Stage Power Converter
A two stage architecture allows optimization of each
individual power stage. It is commonly used because of
Figure 52. Single Stage Power Converter
This approach significantly reduces the component count.
The NCP1652 based solution requires only one each of
MOSFET, magnetic element, output rectifier (low voltage)
and output capacitor (low voltage). In contrast, the 2 ? stage
solution requires two or more of the above ? listed
components. Elimination of certain high ? voltage
components (e.g. high voltage capacitor and high voltage
PFC diode) has significant impact on the system design. The
resultant cost savings and reliability improvement are often
worth the effort of designing a new converter.
Single PFC Stage
While the single stage offers certain benefits, it is
important to recognize that it is not a recommended solution
for all requirements. The following three limitations apply
to the single stage approach:
? The output voltage ripple will have a 2x line frequency
component (120 Hz for North American applications)
that can not be eliminated easily. The cause of this
ripple is the elimination of the energy storage element
that is typically the boost output capacitor in the
2 ? stage solution. The only way to reduce the ripple is to
increase the output filter capacitance. The required
value of capacitance is inversely proportional to the
output voltage – hence this approach is not
recommended for low voltage outputs such as 3.3 V or
5 V. However, if there is a follow ? on dc ? dc converter
stage or a battery after the single stage converter, the
low frequency ripple should not cause any concerns.
? The hold ? up time will not be as good as the 2 ? stage
approach – again due to the lack of an intermediate
energy storage element.
? In a single stage converter, one FET processes all the
power – that is both a benefit and a limitation as the
stress on that main MOSFET is relatively higher.
Similarly, the magnetic component (flyback
transformer/inductor) can not be optimized as well as in
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| NCP1653ADR2 | 功能描述:功率因数校正 IC Fixed Frequency RoHS:否 制造商:Fairchild Semiconductor 开关频率:300 KHz 最大功率耗散: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Reel |
| NCP1653ADR2G | 功能描述:功率因数校正 IC Fixed Frequency Current Mode PFC RoHS:否 制造商:Fairchild Semiconductor 开关频率:300 KHz 最大功率耗散: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Reel |
| NCP1653ADR2G-CUT TAPE | 制造商:ON 功能描述:NCP1653 Series 15 V 6 mA Current-Mode Power Factor Correction Controller SOIC-8 |
| NCP1653AP | 功能描述:功率因数校正 IC Fixed Frequency RoHS:否 制造商:Fairchild Semiconductor 开关频率:300 KHz 最大功率耗散: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Reel |
| NCP1653APG | 功能描述:功率因数校正 IC Fixed Frequency Current Mode PFC RoHS:否 制造商:Fairchild Semiconductor 开关频率:300 KHz 最大功率耗散: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Reel |
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