参数资料
型号: UCC38051DG4
厂商: Texas Instruments
文件页数: 11/32页
文件大小: 0K
描述: IC PFC CTRLR TRANSITION 8SOIC
标准包装: 75
模式: 间歇(跃迁)
频率 - 开关: 200kHz
电流 - 启动: 75µA
电源电压: 12 V ~ 18 V
工作温度: 0°C ~ 70°C
安装类型: 表面贴装
封装/外壳: 8-SOIC(0.154",3.90mm 宽)
供应商设备封装: 8-SOIC
包装: 管件
配用: 296-19036-ND - EVAL MODULE FOR UCC28051
UCC28050, UCC28051
UCC38050, UCC38051
SLUS515F?SEPTEMBER 2002 ? REVISED MARCH 2009
APPLICATION INFORMATION
L
V AC
Q
D
RIAC
C
Load
I AC
Z CD
S
Q
Gate Driver
Logic
X
÷ MULT
I MO
+
R
V EA
X
+
V REF
UDG?02124
Figure 1. Basic Block Diagram of CRM Boost PFC
The power stage equations and the transfer functions of the CRM are the same as the CCM. However,
implementations of the control functions are different. Transition mode forces the inductor current to operate
just at the border of CCM and DCM. The current profile is also different and affects the component power loss
and filtering requirements. The peak current in the CRM boost is twice the amplitude of CCM leading to higher
conduction losses. The peak-to-peak ripple is twice the average current which affects MOSFET switching
losses and magnetics ac losses.
I AVERAGE
(a) CCM
I PEAK
I AVERAGE
(b) DCM
I PEAK
I AVERAGE
Note: Operating Frequency >> 120 Hz
(C) CRM
Figure 2. PFC Inductor Current Profiles
www.ti.com
UDG?02123
11
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