参数资料
型号: IR2167STRPBF
厂商: International Rectifier
文件页数: 18/33页
文件大小: 0K
描述: IC PFC BALLAST CTLR 20-SOIC
标准包装: 1,000
类型: PFC/镇流器控制器
频率: 41 ~ 47 kHz
电流 - 电源: 10mA
电源电压: 11.4 V ~ 15.6 V
工作温度: -40°C ~ 125°C
封装/外壳: 20-SOIC(0.295",7.50mm 宽)
供应商设备封装: 20-SOIC(宽型)
包装: 带卷 (TR)
IR2167(S) & PbF
Figure 7 : Inductor Current
Figure 6: Input Voltage & Current
PF=0.96, THD=22%
The approach used in the IR2167 is classified as running in
critical conduction mode, in which the inductor current
discharges to zero with each switching cycle. There is no
need to sense the rectified AC line input voltage because it
is already sinusoidal. Therefore, the inductor current will
naturally follow the sinusoidal voltage envelope as the PFC
MOSFET is turned on and off at a much higher frequency
(>10KHz) than the line input frequency (50 to 60Hz). The
circuit compares the DC Bus voltage to a fixed reference
voltage to determine the on-time of the PFC MOSFET. The
off-time is determined by the time it takes the LPFC current
to drop to zero. This zero current level is detected by a
secondary winding in LPFC that is connected to the ZX pin.
The result is a system where the switching frequency is free-
running and constantly changing from a high frequency near
the zero crossing of the AC input line voltage, to a lower
frequency at the peaks. (See Figures 7, 8 & 9).
Figure 8: Boost Inductor Envelope & Line Voltage
I LPFC
0
PFC
pin
0
ZX
pin
0
near peak region of
rectified AC line
near zero crossing region
of rectified AC line
Figure 9: Boost FET On Time vs Line Input
18
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