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参数资料
| 型号： | LX1562IDM-TR |
| 厂商： | MICROSEMI CORP-ANALOG MIXED SIGNAL GROUP |
| 元件分类： | 稳压器 |
| 英文描述： | 0.5 A POWER FACTOR CONTROLLER, PDSO8 |
| 封装： | ROHS COMPLIANT, PLASTIC, SOIC-8 |
| 文件页数： | 14/25页 |
| 文件大小： | 430K |
| 代理商： | LX1562IDM-TR |
SECOND-GENERATION POWER FACTOR C ONTROLLER
LX1562/1563
PRODUCT DA T ABOOK 1996/1997
21
Copyright 1996
Rev. 1.3a
8/30
P RODUCTION
D ATA
S HEET
APPLICATION INFORMA TION
POWER MOSFET SELECTION
The voltage rating of MOSFET and rectifier must be higher than
the maximum value of the output voltage.
V
DS ≥ 1.2 VO MAX
V
DS ≥ 282V
The RMS current can be approximated by multiplying the RMS
current at the peak of the line by 0.7.
I
RMS = 0.7 ILP √D/3
D
≡ On-time duty cycle
D = 0.39 at V
AC = 100V
I
LP = 2.4A
I
RMS = (0.7)(2.4)( √.39/3) = 0.61A
R
DS ≤
P
DC ≡ allowable power
I
RMS/triangle = ILP √D/3
dissipation.
R
DS ≤
= 1.6
IRF730 with R
DS = 1
and V
DS = 400V meets the above
requirements.
P
DC
I
RMS
2
1
0.61
I
LP
D
INPUT RECTIFIER AND CAPACITOR SELECTION
The current through each diode is a half-wave rectified sine wave.
The maximum current happens at minimum line with a peak
value of 1.2A.
I
AVE =
=
= 0.38A
choose 1N4004 with 1A rating.
P
DISS = (IAVE) (VF) = 0.38 x 0.9 = 0.344W
T
J = TA + PD x θJA
assuming
θ
JA = 65°C/W for 1/8"
lead length.
T
J = 80 + (.344)(65) = 102°C
I
PEAK
π
1.2
π
Assuming
is the percentage of allowable input current ripple,
C1 can be calculated using the following equations:
R
EFF =
C1
≥
f
SW
≡ Switching frequency
of inductor current
at peak input voltage.
if
= 3%
R
EFF =
= 117
C1
≥
= 0.9F
choose 1F, 250V capacitor.
2 P
O
η I
P
2
1
2π R
EFF fSW
2 x 80
(.95)(1.2)2
1
(.03)(2
π)(117)(50000)
OUTPUT CAPACITOR SELECTION
There are mainly two criteria for selecting the output capacitor:
A large enough capacitance to maintain a low ripple voltage, and
a low ESR value in order to prevent high power dissipation due
to RMS currents.
The output capacitance can be approximated from the following
equation:
C6
≥
where: I
DC
≡ DC output current
DV
≡ Output ripple
I
DC =
= 0.348A
assuming 5% peak to peak ripple,
C6
≥
= 81F
choose C6 = 100F.
I
DC
2
π f
LINE V
80
230
0.348
2
π (60) (11.5)
O
B
SO
LETE
PRO
D
UCT
NOT
RECOMMENDED
FOR
NEW
DESIGNS
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