參數(shù)資料
型號： MC34262
廠商： ON SEMICONDUCTOR
元件分類： 基準電壓源/電流源
英文描述： Power Factor Controllers(功率因數(shù)控制器)
中文描述： 功率因數(shù)控制器（功率因數(shù)控制器）
文件頁數(shù)： 10/19頁
文件大?。?/td> 394K
代理商： MC34262
MC34262, MC33262
http://onsemi.com
10
Table 1. Design Equations
Notes
Calculation
Formula
P
O
= V
O
I
O
Calculate the maximum required output power.
Required Converter Output Power
Calculated at the minimum required ac line voltage
for output regulation. Let the efficiency = 0.92 for
low line operation.
Peak Inductor Current
I
L(pk)
=
2
2 P
O
Vac
(LL)
Let the switching cycle t = 40 s for universal input
(85 to 265 Vac) operation and 20 s for fixed input
(92 to 138 Vac, or 184 to 276 Vac) operation.
Inductance
L
P
=
t
2
2 V
O
P
O
V
O
Vac
(LL)
Vac
(LL)2
In theory the ontime t
on
is constant. In practice t
on
tends to increase at the ac line zero crossings due
to the charge on capacitor C
5
. Let Vac = Vac
(LL)
for initial
t
on
and t
off
calculations.
The offtime t
off
is greatest at the peak of the ac line
voltage and approaches zero at the ac line zero
crossings. Theta ( ) represents the angle of the ac
line voltage.
Switch OnTime
Vac
2
t
on
=
2 P
O
L
P
Switch OffTime
V
O
1
t
off
=
2 Vac
Sin
t
on
The minimum switching frequency occurs at the peak
of the ac line voltage. As the ac line voltage traverses
from peak to zero, t
off
approaches zero producing an
increase in switching frequency.
Switching Frequency
f =
t
on
+ t
off
1
Set the current sense threshold V
CS
to 1.0 V for
universal input (85 Vac to 265 Vac) operation and
to 0.5 V for fixed input (92 Vac to 138 Vac, or
184 Vac to 276 Vac) operation. Note that V
CS
must
be <1.4 V.
Peak Switch Current
R
7
=
I
L(pk)
V
CS
Set the multiplier input voltage V
M
to 3.0 V at high
line. Empirically adjust V
M
for the lowest distortion
over the ac line voltage range while guaranteeing
startup at minimum line.
Multiplier Input Voltage
+ 1
Vac
V
M
=
R
5
R
3
2
The I
IB
R
1
error term can be minimized with a divider
current in excess of 50 A.
Converter Output Voltage
I
IB
R
2
V
O
= V
ref
R
2
R
1
+ 1
The calculated peaktopeak ripple must be less than
16% of the average dc output voltage to prevent false
tripping of the Overvoltage Comparator. Refer to the
Overvoltage Comparator text. ESR is the equivalent
series resistance of C
3
.
The bandwidth is typically set to 20 Hz. When operating
at high ac line, the value of C
1
may need to be
increased. (See Figure 25)
The following converter characteristics must be chosen:
V
O
Desired output voltage
I
O
Desired output current
V
O
Converter output peaktopeak ripple voltage
Converter Output
Peak to Peak
Ripple Voltage
2
+ ESR
2
2 f
ac
C
3
V
O(pp)
= I
O
1
Error Amplifier Bandwidth
BW =
gm
2 C
1
Vac AC RMS line voltage
Vac
(LL)
AC RMS low line voltage
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