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| 型号： | MC33260DR2 |
| 厂商： | ON Semiconductor |
| 文件页数： | 17/22页 |
| 文件大小： | 372K |
| 描述： | IC PFC COMPACT PRECONVERT 8SOIC |
| 产品变化通告： | LTB Notification 03/Jan/2008 |
| 标准包装： | 1 |
| 系列： | GreenLine™ |
| 模式： | 间歇导电（DCM） |
| 电流 - 启动： | 100µA |
| 电源电压： | 11 V ~ 16 V |
| 工作温度： | -40°C ~ 105°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOICN |
| 包装： | 剪切带 (CT) |
| 其它名称： | MC33260DR2OSCT |
MC33260
http://onsemi.com
17
MAIN DESIGN EQUATIONS (Note 3)
rms Input Current (I
ac
)
I
ac
=
P
o
??V
ac
h (preconverter efficiency) is generally in the
range of 90 - - 95%.
Maximum Inductor Peak Current ((I
pk
)max):
(I
pk
)max =
2 ?nbsp 2
R
?(P
o
)max
??V
acLL
(I
pk
)max is the maximum inductor current.
Output Voltage Peak to Peak 100Hz (120Hz) Ripple ((擵o)pk- -pk):
(擵
o
)
pkpk
=
P
o
2??f
ac
?C
o
?V
o
f
ac
is the ac line frequency (50 or 60Hz).
Inductor Value (L
p
):
L
p
=
2 ?t ?SPAN class="pst MC33260DR2G_2636607_5">r
V
o
2
R
V
acLL
u ?/SPAN> V
acLL
2
V
o
?V
acLL
?(I
pk
)max
t is the maximum switching period.
(t = 40 ms) for universal mains operation and
(t = 20 ms) for narrow range are generally
used.
Maximum Power MOSFET Conduction Losses ((p
on
)max):
(P
on
)max H
1
3
?(Rds)on ?(I
pk
)max
2
?SPAN class="pst MC33260DR2G_2636607_7">f1
1.2 ?V
acLL
V
o
i
(Rds)on is the MOSFET drain source on- -time
resistor.
In Follower Boost, the ratio (V
acLL
/V
o
) is
higher. The on- -time MOSFET losses are then
reduced.
Maximum Average Diode Current (I
d
):
(I
d
)max =
(P
o
)max
(V
o
)min
The Average Diode Current depends on the
power and on the output voltage.
Current Sense Resistor Losses (pR
cs
):
pR
cs
=
1
6
?(Rds)on ?(I
pk
)
2
max
This formula indicates the required dissipation
capability for R
cs
(current sense resistor).
Over Current Protection Resistor (R
OCP
):
R
OCP
H
R
cs
?(I
pk
)max
0.205
(k?
The overcurrent threshold is adjusted by R
OCP
at a given R
cs
.
R
cs
can be a preconverter inrush resistor.
Oscillator External Capacitor Value (C
T
):
- -Traditional Operation
C
T
e C
int
+
2 ?K
osc
?L
p
?(P
in
)max?I
2
regL
V
2
ac
The Follower Boost characteristic is adjusted
by the C
T
choice.
The Traditional Mode is also selected by C
T
.
C
int
is the oscillator pin internal capacitor.
- - Follower Boost:
V
o
=
R
o
2
?/DIV>
C
T
+ C
int
K
osc
?L
p
?P
in
R
?V
pk
Feedback Resistor (R
o
):
R
o
=
(V
o
)
reg
V
FB
I
regH
H
V
o
200
(M?
The output voltage regulation level is adjusted
by R
o
.
3. The preconverter design requires the following characteristics specification:
- - (V
o
)
reg
: desired output voltage regulation level
- - (擵
o
)
pk- -pk
: admissible output peak to peak ripple voltage
- - P
o
: desired output power
- - V
ac
: ac rms operating line voltage
- - V
acLL
: minimum ac rms operating line voltage
- - V
FB
: Feedback Pin voltage
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