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| 型號(hào)： | FAN7930CM |
| 廠商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 0.5 A POWER FACTOR CONTROLLER, 350 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | MS-012AA, SOP-8 |
| 文件頁數(shù)： | 4/22頁 |
| 文件大小： | 910K |
| 代理商： | FAN7930CM |
2010 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FAN7930C Rev. 1.0.0
12
FAN7930C
—
Criti
c
al
Conduc
tion
Mode
PFC
Controller
Figure 25.
Two Cases of RDY Triggered HIGH
Figure 26.
Two Cases of RDY Triggered LOW
4. Zero-Current Detection: Zero-current detection
(ZCD) generates the turn-on signal of the MOSFET
when the boost inductor current reaches zero using an
auxiliary winding coupled with the inductor. When the
power switch turns on, negative voltage is induced at the
auxiliary winding due to the opposite winding direction
(see Equation 1)
. Positive voltage is induced (see
Equation 2)
when the power switch turns off.
AC
IND
AUX
V
T
V
=
(1)
()
AC
PFCOUT
IND
AUX
V
T
V
=
(2)
where:
VAUX is the auxiliary winding voltage;
TIND is boost inductor turns;
TIND auxiliary winding turns;
VAC is input voltage for PFC converter; and
VOUT_PFC is output voltage from the PFC converter.
Figure 27.
Circuit Near ZCD
Because auxiliary winding voltage can swing from
negative to positive voltage, the internal block in ZCD
pin has both positive and negative voltage clamping
circuits. When the auxiliary voltage is negative, internal
circuit clamps the negative voltage at the ZCD pin
around 0.65V by sourcing current to the serial resistor
between the ZCD pin and the auxiliary winding. When
the auxiliary voltage is higher than 6.5V, current is
sinked through a resistor from the auxiliary winding to
the ZCD pin.
Figure 28.
Auxiliary Voltage Depends on
MOSFET Switching
The auxiliary winding voltage is used to check the boost
inductor current zero instance. When boost inductor
current becomes zero, there is a resonance between
boost inductor and all capacitors at the MOSFET drain
pin: including COSS of the MOSFET; an external
capacitor at the D-S pin to reduce the voltage rising and
falling slope of the MOSFET; a parasitic capacitor at
inductor; and so on to improve performance. Resonated
voltage is reflected to the auxiliary winding and can be
used for detecting zero current of boost inductor and
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| FAN7930CMX | 功能描述:功率因數(shù)校正 IC Critical Conduction Mode PFC Controller RoHS:否 制造商:Fairchild Semiconductor 開關(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 |
| FAN7930CMX_G | 制造商:Fairchild Semiconductor Corporation 功能描述:IC PFC CTLR CRITICAL CONF 8-SOIC 制造商:Fairchild Semiconductor Corporation 功能描述:Power Factor Correction - PFC Critical Conduction Mode PFC Controller 制造商:Fairchild Semiconductor Corporation 功能描述:Critical Conduction Mode PFC Controller |
| FAN7930DM | 制造商:Fairchild Semiconductor Corporation 功能描述:PFC |
| FAN7930DMX | 制造商:Fairchild Semiconductor Corporation 功能描述:PFC |
| FAN7930M | 功能描述:功率因數(shù)校正 IC Critical Conduction Mode PFC Controller RoHS:否 制造商:Fairchild Semiconductor 開關(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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