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)： 19/39頁(yè)
文件大小： 725K
代理商： UCC28517NE4
SLUS517B DECEMBER 2002 REVISED AUGUST 2004
19
www.ti.com
APPLICATION INFORMATION
The current sense resistor for the PWM stage, R5, is selected so that at maximum current, its voltage is the
threshold voltage of the peak current comparator (nominally 1.3 V).
R5
V
TH
PWM stage
I
LIMIT
i
Q2(peak)
In many cases, an input line filter will be necessary in order to meet the requirements of an agency or application.
The input line filter design has been omitted from this procedure due to the vast array of requirements and
circumstances. We urge you to refer to Reference [11] for details.
PFC stage control
The PFC stage is designed in a three-step process. First, set the dynamic range of the multiplier, second,
stabilize the average current control loop and third, stabilize the voltage loop that controls the energy storage
capacitor voltage. Use as much of the dynamic range of the multiplier as possible. The current control loop must
have wide bandwidth in order to follow the instantaneous rectified line voltage. The voltage loop must be slower
than twice the ac line frequency so that it will not compromise the power factor.
multiplier
The dynamic range of the multiplier is a function of the currents and/or voltages of the IAC, VAOUT and VFF
pins. Coordinate the selection process to use the full range of the multiplier and obtain the desired power limiting
features. Select the components R1 and R15 to use the i
IAC
(t) range and the V
VFF
range under the condition
that the maximum of the V
VAOUT
range, described in equation 11. The selection process is similar to the
selection process for UC3854, except for the VFF voltage and MOUT current limitations.
[12]
In this product
series, the divide-by-square function is internally implemented so that it divides by the greater of 1.4 V or V
VFF
.
If the 1.4-V level controls the divider, power factor correction may still occur if the VAOUT level is within the
functioning range of the multiplier. Power factor correction occurs during that condition because the multiplier
section functions as a two-input multiplier, rather than a three-input multiplier. Notice that the voltage at the VFF
pin will be proportional to the average of the IAC current. Typically, V
VFF
=1.4 V at low ac line voltage is set as
the design boundary; the upper boundary of V
VFF
will remain within the range if the functional ac line voltage
range varies by less than 4.3:1.
0
i
IAC
(t)
500 A,
0
V
VAOUT
(t)
5 V,
1.4 V
V
VFF
V
VREF
1.4 V
(10)
(11)
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
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*