參數(shù)資料
型號(hào)： MC33260DR2G
廠商： ON SEMICONDUCTOR
元件分類(lèi)： 穩(wěn)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, PDSO8
封裝： LEAD FREE, SOIC-8
文件頁(yè)數(shù)： 10/22頁(yè)
文件大小： 232K
代理商： MC33260DR2G
MC33260
http://onsemi.com
10
Pin Numbers are Relevant to the PDIP8 Version
Ro
VoregH
Vpin1
IregH
Consequently:
In practice, V
pin1
is small compared to (V
o
)
regH
and this
equation can be simplified as follows (I
regH
being also
replaced by its typical value 200 A
):
Ro
5
The regulation block output is connected to the Pin 2
through a 300 k
resistor. The Pin 2 voltage (V
control
) is
compared to the oscillator sawtooth for PWM control.
An external capacitor must be connected between Pin 2
and ground, for external loop compensation. The bandwidth
is typically set below 20 Hz so that the regulation block
output should be relatively constant over a given ac line
cycle. This integration that results in a constant ontime over
the ac line period, prevents the mains frequency output
ripple from distorting the ac line current.
VoregH(k )
OSCILLATOR SECTION
The oscillator consists of three phases:
Charge Phase: The oscillator capacitor voltage grows
up linearly from its bottom value (ground) until it
exceeds V
control
(regulation block output voltage). At
that moment, the PWM latch output gets low and the
oscillator discharge sequence is set.
Discharge Phase: The oscillator capacitor is abruptly
discharged down to its valley value (0 V).
Waiting Phase: At the end of the discharge sequence,
the oscillator voltage is maintained in a low state until
the PWM latch is set again.
Figure 26. Oscillator
I
charge
= 2
I
o
I
o
/ I
ref
0
1
CT
3
15 pF
0
1
Output_Ctrl
The oscillator charge current is dependent on the feedback
current (I
o
). In effect
Icharge
2
I2
o
Iref
where:
I
charge
is the oscillator charge current,
I
o
is the feedback current (drawn by Pin 1),
I
ref
is the internal reference current (200 A
).
So, the oscillator charge current is linked to the output
voltage level as follows:
Icharge
2
Vo
R2
Vpin1
2
o
Iref
where:
V
o
is the output voltage,
R
o
is the feedback resistor,
V
pin1
is the Pin 1 clamp voltage.
In practice, V
pin1
that is in the range of 2.5 V, is very small
compared to V
o
. The equation can then be simplified by
neglecting V
pin1
:
Icharge
2
V2
o
R2
o
Iref
It must be noticed that the oscillator terminal (Pin 3) has
an internal capacitance (C
int
) that varies versus the Pin 3
voltage. Over the oscillator swing, its average value
typically equals 15 pF (min 10 pF, max 20 pF).
The total oscillator capacitor is then the sum of the internal
and external capacitors.
Cpin3
CT
Cint
PWM LATCH SECTION
The MC33260 operates in voltage mode: the regulation
block output (V
control
Pin 2 voltage) is compared to the
oscillator sawtooth so that the gate drive signal (Pin 7) is
high until the oscillator ramp exceeds V
control
.
The ontime is then given by the following equation:
Cpin3
ton
Vcontrol
Ich
where:
t
on
is the ontime,
C
pin3
is the total oscillator capacitor (sum of the
internal and external capacitor),
I
charge
is the oscillator charge current (Pin 3 current),
V
control
is the Pin 2 voltage (regulation block output).
Consequently, replacing I
charge
by the expression given in
the
Oscillator Section
:
R2
o
2
ton
Iref
Cpin3
Vcontrol
V2
o
One can notice that the ontime depends on V
o
(preconverter output voltage) and that the ontime is
maximum when Vcontrol is maximum (1.5 V typically).
At a given V
o
, the maximum ontime is then expressed by
the following equation:
tonmax
Cpin3
R2
o
Iref
Vcontrolmax
2
V2
o
This equation can be simplified replacing
2
[(Vcontrol)max* Iref]
by Kosc
Refer to
Electrical Characteristics, Oscillator Section
.
Then:
tonmax
Cpin3
Kosc
R2
o
V2
o
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