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參數(shù)資料
| 型號： | MC33260DR2G |
| 廠商： | ON Semiconductor |
| 文件頁數(shù)： | 15/22頁 |
| 文件大?。?/td> | 372K |
| 描述： | IC PFC CONTROLLER DCM 8SOIC |
| 產(chǎn)品變化通告： | Reactivation Notice 08/Apr/2011 Product Discontinuation 27/Jan/2012 |
| 標準包裝： | 1 |
| 系列： | GreenLine™ |
| 模式： | 間歇導(dǎo)電（DCM） |
| 電流 - 啟動： | 100µA |
| 電源電壓： | 11 V ~ 16 V |
| 工作溫度： | -40°C ~ 105°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 8-SOIC（0.154"，3.90mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 8-SOICN |
| 包裝： | 剪切帶 (CT) |
| 其它名稱： | MC33260DR2GOSCT |
MC33260
http://onsemi.com
15
Pin Numbers are Relevant to the PDIP- -8 Version
Ontheotherhand,theboosttopologyhasitsownrulethat
dictatestheon- -timenecessarytodelivertherequiredpower:
t
on
=
4 ?L
p
?P
in
V
2
pk
where:
V
pk
is the peak ac line voltage,
L
p
is the inductor value,
P
in
is the input power.
Combining the two equations, one can obtain the
Follower Boost equation:
V
o
=
R
o
2
?/DIV>
C
pin3
K
osc
?L
p
?P
in
R
?V
pk
Consequently, a linear dependency links the output
voltage to the ac line amplitude at a given input power.
Figure 34. Follower Boost Characteristics
The Regulation Block is Active
t
on
on--time
V
o
P
in
Output Voltage
Input Power
t
on
= k/V
o
2
V
ac
(V
ac
)max
(V
ac
)min
The behavior of the output voltage is depicted in
Figures 34 and 35. In particular, Figure 35 illustrates how
the output voltage converges to a stable equilibrium level.
First,atagivenaclinevoltage,theon- -timeisdictatedbythe
power demand. Then, the follower boost characteristic
makes correspond one output voltage level to this on- -time.
Combining these two laws, it appears that the power level
forces the output voltage.
One can notice that the system is fully stable:
?nbsp Ifanoutputvoltageincreasemakesitmoveawayfrom
its equilibrium value, the on- -time will immediately
diminishaccordingtothefollowerboostlaw.Thiswill
result in a delivered power decrease. Consequently,
the supplied power being too low, the output voltage
will decrease back,
?nbsp Inthesameway,iftheoutputvoltagedecreases,more
power will be transferred and then the output voltage
will increase back.
Figure 35. Follower Boost Output Voltage
V
acLL
V
ac
V
acHL
V
ac
V
o
Regulation Block is Active
V
o
= V
pk
P
in
(P
in
)min
(P
in
)max
non usable area
Mode Selection
The operation mode is simply selected by adjusting the
oscillatorcapacitorvalue.AsshowninFigure 35,theoutput
voltagefirsthasanincreasinglinearcharacteristicversusthe
ac line magnitude and then is clamped down to the
regulation value. In the traditional mode, the linear area
must be rejected. This is achieved by dimensioning the
oscillator capacitor so that the boost can deliver the
maximum power while the output voltage equals its
regulation level and this, whatever the given input voltage.
Practically, that means that whatever the power and input
voltage conditions are, the follower boost would generate
output voltages values higher than the regulation level, if
there was no regulation block.
In other words, if (V
o
)
regL
is the low output regulation
level:
r
V
o
u
regL
d
R
o
2
?/DIV>
C
T
+ C
int
K
osc
?L
p
?/DIV>
r
P
in
u
max
R
?V
pk
Consequently,
C
T
e - -C
int
+
4 ?K
osc
?L
p
?/DIV>
r
P
in
u
max ?/DIV>
r
V
o
u
2
regL
R
2
o
?V
2
pk
Using I
regL
(regulation block current reference), this
equation can be simplified as follows:
C
T
e - -C
int
+
4 ?K
osc
?L
p
?/DIV>
r
P
in
u
max ?I
2
regL
V
2
pk
In the Follower Boost case, the oscillator capacitor must
be chosen so that the wished characteristics are obtained.
Consequently, the simple choice of the oscillator
capacitor enables the mode selection.
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