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)： 20/39頁(yè)
文件大?。?/td> 725K
代理商： UCC28517NE4
SLUS517B DECEMBER 2002 REVISED AUGUST 2004
20
www.ti.com
APPLICATION INFORMATION
The selection process begins with the selection of R1 so that the peak I
AC
current at high ac line is about 500
μ
A,
see Table 2. Second, select R15 for the minimum VFF voltage, also shown in Table 2. Third, select C8, in Table
2, to average the VFF voltage with sufficiently low ripple to meet a third harmonic distortion budget. For a system
with a 3% THD target, it is typical to allow the feedforward circuit to contribute 1.5% third harmonic distortion
to the input waveform [4]. An attenuation factor of 0.022 will meet the criteria. Finally, select the MOUT resistor
in Table 2, R12, so that the voltage across R12 equals the voltage across sense resistor R2 under the condition
of maximum power, minimum ac line voltage (V
VFF, MIN
), and VAOUT at its maximum level of 5 V. Experimentally,
the multiplier output resistor, R12, may need to be increased slightly if the energy storage capacitor voltage sags
under maximum load. This would be due to tolerances in the components and the multiplier. In order to minimize
current amplifier offsets, set the value of the resistor on the ISENSE1 pin, R8, equal to the value of R12 as shown
in in Table 2.
Table 2.
REFERENCE
DESIGNATOR
EQUATION
NOTES
R1
2VAC(max)
IIAC(peak)
set iIAC(peak)
500 A
R15
2
R1
VVFF(avgmin)
VAC(min)
1
fAC
0.9
set V
VFF(avgmin)
1.4 V
C8
2
AFF(2)
R15
AFF(2)
0.022 for 3% THD
R12
Ipk
R1
R2
k
VFF(min)
2
2
VAC(min)
VVAOUT(max)
1 V
k = 1/V
VAC(min) = minimum RMS input voltage
VVFF(min) = 1.4V
VVAOUT(max) = 5.0V
R8
R12
Always change R8 if R12 is changed
PFC current loop control
This controller uses average current loop control for the PFC stage. The current control loop must typically be
fast enough to track the rectified sinusoidal ac line voltage. There are many ways to design a controller that will
stabilize the PFC current loop. The method that is described here achieves good results for most applications.
[5]
This method assumes that both the natural frequency of the system and the zero of the linearized boost PFC
are much lower than both the switching frequency and the desired crossover frequency, f
CO(pfc)
, as described
in equation 12. The left side of the inequality in equation 12 will usually be true since the capacitance of C1 is
quite large.
1
D
PWM(min)
L1
C1
and
2P
IN
C1
V
C1
2
2
f
CO(pfc)
2
f
S(pfc)
(12)
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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(kāi)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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