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參數(shù)資料
| 型號： | NCP1651DR2G |
| 廠商： | ON Semiconductor |
| 文件頁數(shù)： | 28/32頁 |
| 文件大小： | 779K |
| 描述： | IC PFC CONTROLLER CCM/DCM 16SOIC |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 模式： | 連續(xù)導(dǎo)電（CCM），間歇導(dǎo)電（DCM） |
| 頻率 - 開關(guān)： | 25kHz ~ 250kHz |
| 電流 - 啟動： | 8.5mA |
| 電源電壓： | 10 V ~ 18 V |
| 工作溫度： | -40°C ~ 125°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 16-SOIC（0.154"，3.90mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 16-SOIC |
| 包裝： | 標(biāo)準(zhǔn)包裝 |
| 其它名稱： | NCP1651DR2GOSDKR |
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NCP1651
http://onsemi.com
28
Current Scaling Resistor & Filter Capacitor
R
7
sets the gain of the averaged current signal out of the
current sense amplifier which is fed into the AC error
amplifier. R
7
is used to scale the current to the appropriate
level for protection purposes in the AC error amplifier
circuit.
R
7
should be calculated to limit the maximum current
signal at the input to the AC error amplifier to less than
4.5 volts at low line and full load. 4.5 volts is the clamp
voltageattheoutputofthereferenceamplifierandlimitsthe
maximum averaged current that the unit can process. The
equation for R
7
is:
R
7
=
212 k ?R
S
?P
in
Vin
LL
r
4.5 (0.75 ?AC
ratio
?Vin
LL
?nbsp 2
R
)
u
Where: P
in
= rated input power (W)
Where: R
S
= Shunt resistance (W)
Where: V
inLL
= min. operating rms input voltage (W)
Where: AC
ratio
= AC attenuation factor at pin 9
This equation does not allow for tolerances, and it would
beadvisabletoincreasetheinputpowertoassureoperation
at maximum power over production tolerance variations.
Thecurrentsensefiltercapacitorshouldbeselectedtoset
its pole about a factor of 10 below the switching frequency.
C
6
=
5.3
f
Where: C
6
= Pin 6 capacitance (nF)
Where: f = pole frequency (kHz)
so, for a 100 kHz switching frequency, a 10 kHz pole is
desirable, and C
6
would be 0.5 nF.
Reference Multiplier
The output of the reference multiplier is a pulse width
modulatedrepresentationoftheanaloginput.Themultiplier
is internally loaded with a resistor to ground which will set
the DC gain. An external capacitor is required to filter the
signal back into one that resembles the input fullwave
rectifiedsinewave.Thepoleforthiscircuitshouldbegreater
than the line frequency and lower than the switching
frequency.
1/15th of the switching frequency is a recommended
startingvaluefora60Hzlinefrequency.Thefiltercapacitor
for pin 10 can be determined by the following equation:
C
10
=
1
2 3.14 25 k f
pole
=
6.366E- -6
f
pole
Where: C
10
= Pin 10 capacitance (F)
Where: f
pole
= Ref gain pole freq (Hz)
AC Error Amplifier
The AC error amplifier is a transconductance amplifier
that is terminated with a series R
C
impedance. This creates
a pole- -zero pair.
To determine the values of R
3
and C
3
, it is necessary to
look at the two signals that reach the PWM inputs. The
non- -inverting input is a slow loop using the averaged
current signal. Its gain is:
A
If
=
30 k
3 k
?/DIV>
15 k
R
7
?(g
m
?R
11
) ?2.3
Wherethefirsttwotermsarethegainsinthecurrentsense
amplifier averaging circuit. The next term is the gain of the
transconductance amplifier and the constant is the gain of
the AC Reference Buffer.
The high frequency path is that of the instantaneous
currentsignaltothePWMnon- -invertinginput.Thisgainis
16 k/3 k = 5.33, since the input signal is converted to a
current through a 3 k resistor in the current sense amplifier,
and then terminated by the 16 k resistor at the PWM input.
less than the gain of the high frequency path. This can be
written as:
345, 000 ?/DIV>
g
m ?R
11
R
7
< 5.3
The suggested resistor and capacitor values are:
R
11
=
R
7
130,000 g
m
and for a zero at 1/10th of the switching frequency
C
11
=
1.59
f
SW
R
11
Where: R
7
& R
11
are in units of Ohms
Where: g
m
is in units of mhos
Where: C
11
is in Farads
Where: f
sw
is in Hz
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