參數(shù)資料
型號(hào)： IR2167S
廠商： International Rectifier
元件分類(lèi)： 基準(zhǔn)電壓源/電流源
英文描述： PFC Ballast Control. Thermal Overload Protection. Brown Out Protection. Programmable Preheat and Frequency. Programmable Deadtime in a 20 Lead SOIC package
中文描述： PFC的鎮(zhèn)流器控制。熱過(guò)載保護(hù)。欠壓保護(hù)?？删幊填A(yù)熱和頻率。可編程死區(qū)時(shí)間在20引腳SOIC封裝
文件頁(yè)數(shù)： 18/30頁(yè)
文件大?。?/td> 937K
代理商： IR2167S
IR2167(
S
)
18
www.irf.com
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).
0
0
0
I
LPFC
PFC
pin
ZX
pin
near peak region of
rectified AC line
near zero crossing region
of rectified AC line
Figure 7
: Inductor Current
Figure 8:
Boost Inductor Envelope & Line Voltage
Figure 9:
Boost FET On Time vs Line Input
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