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參數(shù)資料
| 型號(hào)： | MC33260DR2 |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 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： | SOIC-8 |
| 文件頁(yè)數(shù)： | 17/22頁(yè) |
| 文件大小： | 232K |
| 代理商： | MC33260DR2 |
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MC33260
http://onsemi.com
17
MAIN DESIGN EQUATIONS
(Note 3)
rms Input Current (I
ac
)
Iac
Po
Vac
η
(preconverter efficiency) is generally in the
range of 90 95%.
Maximum Inductor Peak Current ((I
pk
)max):
(Ipk)max
2
2
(Po)max
VacLL
(I
pk
)max is the maximum inductor current.
Output Voltage Peak to Peak 100Hz (120Hz) Ripple (( Vo)pkpk):
( Vo)pk–pk
Po
2
fac
Co
Vo
f
ac
is the ac line frequency (50 or 60Hz).
Inductor Value (L
p
):
Lp
2
t
Vo
2
VacLL
VacLL
VacLL
2
Vo
(Ipk)max
t is the maximum switching period.
(t = 40 s) for universal mains operation and
(t = 20
s) for narrow range are generally
used.
Maximum Power MOSFET Conduction Losses ((p
on
)max):
(Pon)max
1
3
(Rds)on
(Ipk)max
2
1
1.2
VacLL
Vo
(Rds)on is the MOSFET drain source ontime
resistor.
In Follower Boost, the ratio (V
acLL
/V
o
) is
higher. The ontime MOSFET losses are then
reduced.
Maximum Average Diode Current (I
d
):
(Id)max
(Po)max
(Vo)min
The Average Diode Current depends on the
power and on the output voltage.
Current Sense Resistor Losses (pR
cs
):
pRcs
1
6
(Rds)on
(Ipk)
2
max
This formula indicates the required dissipation
capability for R
cs
(current sense resistor).
Over Current Protection Resistor (R
OCP
):
ROCP
Rcs
(Ipk)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
CT
Cint
2
Kosc
Lp
(Pin)max
V
2
ac
I
regL
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:
Vo
Ro
2
CT
Cint
Lp
Kosc
Pin
Vpk
Feedback Resistor (R
o
):
Ro
(Vo)reg
V
FB
IregH
Vo
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
( V
o
)
pkpk
: 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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