参数资料
型号: UCC38050PE4
厂商: Texas Instruments
文件页数: 15/32页
文件大小: 0K
描述: IC PFC CTRLR TRANSITION 8DIP
标准包装: 50
模式: 间歇(跃迁)
频率 - 开关: 200kHz
电流 - 启动: 75µA
电源电压: 15.4 V ~ 18 V
工作温度: 0°C ~ 70°C
安装类型: 通孔
封装/外壳: 8-DIP(0.300",7.62mm)
供应商设备封装: 8-PDIP
包装: 管件
配用: 296-19044-ND - EVAL MODULE FOR UCC38050
296-19036-ND - EVAL MODULE FOR UCC28051
UCC28050, UCC28051
UCC38050, UCC38051
SLUS515F?SEPTEMBER 2002 ? REVISED MARCH 2009
APPLICATION INFORMATION
A controller that has integral control at low frequencies requires a zero near the crossover frequency in order
to be stable. The resulting g M amplifer configuration is shown in Figure 3.
V OUT
+
C V1
C V2
V REF
R V1
UDG?02122
Figure 3. g M Amplifier Configuration
The compensator transfer function is:
C V1
A V +
g M
C V1 ) C V2
s
1 ) R V1
1 ) R V1
s
C V1 C V2
C V1 ) C V2
s
(14)
where g M = dc transconductance gain = 100 μ s
The limiting factor of the gain is usually the allowable third harmonic distortion, though other harmonics can
dominate. The crossover frequency of the control loop will be much lower than twice the ac line voltage. In order
to choose the compensator dynamics, determine the maximum allowable loop gain at twice the line frequency
and solve for capacitor C V2 . This also determines the crossover frequency.
C V2 +
V AC(max)
4 p f AC
2
V OUT(avg) R S1
g M
k (crm)
k 1
C OUT(max loop gain @ 2 f
AC )
(15)
f CO + p AC
V
C V2
V OUT
g M
R S1
k 1
k(cmr)
C OUT
(16)
Select C V1 so that the low frequency zero is one-tenth of the crossover frequency.
C V1 + 9 C V2
Select R V1 so that the pole is at the crossover frequency.
(17)
[
1
2 p f CO C V2
www.ti.com
(18)
15
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