參數(shù)資料
型號(hào)： SG6980DZ
廠商： FAIRCHILD SEMICONDUCTOR CORP
元件分類： 穩(wěn)壓器
英文描述： Single-Stage PFC Controller
中文描述： POWER FACTOR CONTROLLER, 68 kHz SWITCHING FREQ-MAX, PDIP16
封裝： LEAD FREE, PLASTIC, DIP-16
文件頁(yè)數(shù)： 12/18頁(yè)
文件大?。?/td> 734K
代理商： SG6980DZ
Product Specification
Single-Stage PFC Controller
ON/OFF
SG6980
System General Corp.
Version 1.0.1 (IAO33.0064.B0)
- 12 -
www.sg.com.tw www.fairchildsemi.com
September 17, 2007
For ON/OFF control, the SG6980 is disabled immediately
if the voltage at this pin is below 1V. Usually, the pin
opens when turn off can have the best power saving. The
operating current during turn off is less than 35μA.
SYNC Signal Section
The SG6980 can synchronize the OUT and synchronize
signals provided by second stage, which reduces switching
noise and the ripple on output voltage. Figure 3 shows the
relationship between the OUT and SYNC signals.
FIG.3 Synchronized Interleaving-Switching
RDY Signal Section
SG6980 provides a RDY pin to inform the next stage and
other applications. RDY signal is high impedance when
the FB voltage goes up to 2.7V and delays around 5ms.
Use the pin to turn on the second stage PWM when the
bulk capacitor voltage is high enough. In SG6980, the
RDY
pin
(open-drain
next-stage-ready signal.
structure)
is
used
for
PFC Operation
The purpose of a boost active power factor corrector (PFC)
is to shape the input current of a power supply. The input
current waveform and phase follow that of the input
voltage. Using SG6980, average-current-mode control is
utilized for continuous-current-mode operation for the
PFC booster. With the innovative multi-vector control for
voltage loop and switching-charge multiplier/divider for
current reference, excellent input power factor is achieved
with good noise immunity and transient response. Figure
4
shows
the
total
control
average-current-mode control circuit of SG6980.
loop
for
the
FIG.4 Multiplier and Control Loop of PFC Stage
The current source output from the switching-charge
multiplier/divider can be expressed as:
)
μA
(
V
V
I
K
MO
I
2
RMS
EA
AC
×
×
=
-----------------
(4)
I
MP
, the current output from IMP pin, is the summation of
I
MO
and I
MR1
. I
MR1
and I
MR2
are identical, fixed-current
sources. R
2
and R
3
are also identical. They are used to pull
high the operating point of the IMP and ICS pins if the
voltage across R
S
goes negative with respect to ground.
Through the differential amplification of the signal across
Rs, better noise immunity is achieved. The output of IEA
is compared with an internal sawtooth and the pulse width
for PFC is determined. Through the average current-mode
control loop, the input current I
S
is proportional to I
MO
:
S
S
MO
R
I
R
I
×
=
×
2
---------------
(5)
According to Equation 5, the minimum value of R
2
and
maximum of R
S
can be determined because I
MO
should
not exceed the specified maximum value.
There are different concerns in determining the value of
the sense resistor, R
S
. The value of R
S
should be small
enough to reduce power consumption, large enough to
maintain the resolution. A current transformer (CT) may
be used to improve the efficiency of high-power
converters.
To achieve a good power factor, the voltage for V
RMS
and
V
EA
should be kept as DC as possible, according to
Equation 4. Good RC filtering for V
RMS
and narrow
bandwidth (lower than the line frequency) for voltage
loop are suggested for better input current shaping. The
transconductance error amplifier has output impedance
R
O
and a capacitor C
EA
(1μF ~ 10μF) connected to ground
(as shown in Figure 4). This establishes a dominant pole
f1
(per Equation 6) for the voltage loop.
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