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參數資料
| 型號： | MC33260PG |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 穩壓器 |
| 英文描述： | GreenLine TM Compact Power Factor Controller: Innovative Circuit for Cost Effective Solutions |
| 中文描述： | 0.5 A POWER FACTOR CONTROLLER, PDIP8 |
| 封裝： | LEAD FREE, PLASTIC, DIP-8 |
| 文件頁數： | 15/22頁 |
| 文件大小： | 232K |
| 代理商： | MC33260PG |
MC33260
http://onsemi.com
15
Pin Numbers are Relevant to the PDIP8 Version
On the other hand, the boost topology has its own rule that
dictates the ontime necessary to deliver the required power:
4
ton
Lp
V2
Pin
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:
Vo
Ro
2
Cpin3
Lp
Kosc
Pin
Vpk
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
O
I
t
on
ontime
V
o
P
in
Output Voltage
Input Power
t
on
= k/V
o2
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, at a given ac line voltage, the ontime is dictated by the
power demand. Then, the follower boost characteristic
makes correspond one output voltage level to this ontime.
Combining these two laws, it appears that the power level
forces the output voltage.
One can notice that the system is fully stable:
If an output voltage increase makes it move away from
its equilibrium value, the ontime will immediately
diminish according to the follower boost law. This will
result in a delivered power decrease. Consequently,
the supplied power being too low, the output voltage
will decrease back,
In the same way, if the output voltage decreases, 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
oscillator capacitor value. As shown in Figure 35, the output
voltage first has an increasing linear characteristic versus the
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:
VoregL
Ro
2
CT
Cint
Pinmax
Kosc
Lp
Vpk
Consequently,
CT
Cint
4
Kosc
Lp
Pinmax
V2
pk
Vo
2
regL
R2
o
Using I
regL
(regulation block current reference), this
equation can be simplified as follows:
CT
Cint
4
Kosc
Lp
Pinmax
I2
regL
V2
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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