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| 型号： | MC34262PG |
| 厂商： | ON Semiconductor |
| 文件页数： | 10/19页 |
| 文件大小： | 394K |
| 描述： | IC PFC CONTROLLER CRM 8DIP |
| 标准包装： | 50 |
| 模式： | 临界传导（CRM） |
| 电流 - 启动： | 250µA |
| 电源电压： | 12 V ~ 28 V |
| 工作温度： | 0°C ~ 85°C |
| 安装类型： | 通孔 |
| 封装/外壳： | 8-DIP（0.300"，7.62mm） |
| 供应商设备封装： | 8-PDIP |
| 包装： | 管件 |
| 产品目录页面： | 1126 (CN2011-ZH PDF) |
| 其它名称： | MC34262PG-ND MC34262PGOS |
MC34262, MC33262
http://onsemi.com
10
Table 1. Design Equations
Notes
Calculation
Formula
Calculate the maximum required output power.
Required Converter Output Power
P
O
= V
O
I
O
Calculated at the minimum required ac line voltage
for output regulation. Let the efficiency h = 0.92 for
low line operation.
Peak Inductor Current
I
L(pk)
=
2 2 P
O
hVac
(LL)
Let the switching cycle t = 40 ms for universal input
(85 to 265 Vac) operation and 20 ms 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)
h 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.
Switch OnTime
h Vac
2
t
on
=
2 P
O
L
P
The offtime t
off
is greatest at the peak of the ac line
voltage and approaches zero at the ac line zero
crossings. Theta (q) represents the angle of the ac
line voltage.
Switch OffTime
V
O
1
t
off
=
2 Vac
猄in q?/DIV>
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
2
R
3
The I
IB
R
1
error term can be minimized with a divider
current in excess of 50 mA.
Converter Output Voltage
I
IB
R
2
V
O
= V
ref
R
2
+ 1
R
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
.
Converter Output
Peak to Peak
Ripple Voltage
2
2pf
ac
C
3
+ ESR
2
DV
O(pp)
= I
O
1
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 26)
Error Amplifier Bandwidth
BW =
gm
2 p C
1
The following converter characteristics must be chosen:
V
O
Desired output voltage
I
O
Desired output current
DV
O
Converter output peaktopeak ripple voltage
Vac AC RMS line voltage
Vac
(LL)
AC RMS low line voltage
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