參數(shù)資料
型號(hào)： UCC28517NE4
廠商： Texas Instruments, Inc.
元件分類： 基準(zhǔn)電壓源/電流源
英文描述： ADVANCED PFC/PWM COMBINA CONTROLLERS
中文描述： 高級(jí)式PFC /脈寬調(diào)制COMBINA控制器
文件頁(yè)數(shù)： 14/39頁(yè)
文件大小： 725K
代理商： UCC28517NE4
SLUS517B DECEMBER 2002 REVISED AUGUST 2004
14
www.ti.com
APPLICATION INFORMATION
design procedure
The following discussion steps through the typical design process of a PFC/PWM converter system that is
controlled by one of the UCC28510 options. The design process begins with the power stage elements, then
the control elements for the PFC stage, then the control elements for the PWM stage. Keep in mind that a
general design process is often iterative. Iteration typically begins after either simulating and/or testing the
completed PFC/PWM system. This design procedure refers to the typical application in Figure 1.
A design begins with a list of requirements for output voltage, output power and ac line voltage range. Other
details, such as efficiency and permissible current harmonics could be given at the onset, or developed
throughout the product design cycle. The need for power factor correction arises from either an agency
requirement, such as IEC61000, or if the available line power is nearly equal to the output power of the power
system. Hold-up time requirements are also necessary at the early stages of design. Typically, the hold-up time,
t
HU
, is at least the period of 1.5 line cycles.
The general structure of the PFC/PWM stage power system is two switched-mode converters connected in
cascade. Each stage has an associated efficiency and each stage has its own set of fault limiting controls that
must be properly set in order to achieve the desired line harmonic and load regulation performance,
simultaneously. The PFC stage must always be designed to supply sufficient average power to the PWM stage.
The cycle-by-cycle current limit of the PFC stage should be programmed to activate at a slightly larger power
level at low ac line voltage than the average power clamp in order to allow for PFC current sense tolerances.
This will allow power factor correction for the full range of maximum rated load. If the instantaneous load nearly
equals the average load, then the fault clamps for the PWM stage can be programmed to limit power at a level
that is slightly less than or equal to the average power clamp of the PFC stage. The margin for the clamping
action should allow for measurement tolerances and efficiency. Conversely, if the instantaneous load has high
peaks that are much shorter than the hold-up time, the current limit and duty ratio limits of the PWM stage can
clamp at a higher level than the average power clamp in the PFC stage. In order to simplify the design procedure,
the average and the peak loads of the PWM stage are assumed to be equal. Thus, all of the current limits and
duty cycle limits are programmed to clamp power at a slightly lower level (10%) than the average power clamp
on the PFC stage.
developing the internal parameters
Select the energy storage voltage V
C1
(the voltage on the PFC output capacitor). Since the PFC stage is a boost
converter, the voltage across C1 must be larger than the peak ac line voltage by enough to permit controllability
in the event of load transients. Typically, this will be around 5% which is about 400 V for a universal ac line
application of 85 V
AC
to 265 V
AC
.
Once the energy storage voltage, V
C1
, is determined, the range of the PFC stage duty ratio, D
1
, is set. For CCM
operation of the PFC stage, the minimum PFC duty ratio is given by:
D
1(min)
1
2
VAC
MIN
V
C1
(1)
相關(guān)PDF資料
PDF描述
UCC28510DWR ADVANCED PFC/PWM COMBINA CONTROLLERS
UCC28510-17 ADVANCED PFC/PWW COMBINATION CONTROLLER WITH TRAILING-EDGE/TRAILING-EDGE MODULATION
UCC38517 ADVANCED PFC/PWM COMBINA CONTROLLERS
UCC28517N ADVANCED PFC/PWM COMBINATION CONTROLLERS
UCC2882-1 Average Current Mode Synchronous Controller With 5-Bit DAC
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
UCC28521 制造商:TI 制造商全稱:Texas Instruments 功能描述:ADVANCED PFC/PWW COMBINATION CONTROLLER WITH TRAILING-EDGE/TRAILING-EDGE MODULATION
UCC28521DW 功能描述:功率因數(shù)校正 IC PWM/PFC Controller w/TEM/TEM Modulation RoHS:否 制造商:Fairchild Semiconductor 開關(guān)頻率:300 KHz 最大功率耗散: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Reel
UCC28521DWG4 功能描述:功率因數(shù)校正 IC Adv PWM/PFC Combo Cntrlr RoHS:否 制造商:Fairchild Semiconductor 開關(guān)頻率:300 KHz 最大功率耗散: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Reel
UCC28521DWR 功能描述:功率因數(shù)校正 IC PWM/PFC Controller w/TEM/TEM Modulation RoHS:否 制造商:Fairchild Semiconductor 開關(guān)頻率:300 KHz 最大功率耗散: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Reel
UCC28521DWRG4 功能描述:功率因數(shù)校正 IC PWM/PFC Controller w/TEM/TEM Modulation RoHS:否 制造商:Fairchild Semiconductor 開關(guān)頻率:300 KHz 最大功率耗散: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Reel
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