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參數(shù)資料
| 型號(hào)： | ML4819 |
| 廠商： | Fairchild Semiconductor Corporation |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | Power Factor and PWM Controller “Combo” |
| 中文描述： | 功率因數(shù)和PWM控制器“組合” |
| 文件頁(yè)數(shù)： | 11/15頁(yè) |
| 文件大小： | 269K |
| 代理商： | ML4819 |
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ML4819
REV. 1.0 10/10/2000
11
The value of R
9
(pin 3) depends on the selection of R
2
(pin 6).
R
V
I
mA
k
IN MAX PEAK
(
SINE PEAK
(
2
260 1 414
0 72
.
510
=
=
=
)
)
.
(12)
R
V
V
R
k
k
CLAMP
IN MIN PEAK
(
9
2
4 8 510
80 1 414
22
>
×
=
=
)
.
.
(13)
Choose R9 = 27k
The peak of the inductor current can be found
approximately by:
I
P
V
A
LPEAK
OUT
IN MIN RMS
(
=
×
=
×
=
1 414
.
1 414
.
200
90
3 14
.
)
(14)
Next select N
C
, which depends on the maximum switch
current. Assume 4A for this example. N
C
is 80 turns.
R
V
N
I
CLAMP
C
LPEAK
11
4 9 80
4
100
=
×
=
=
.
(15)
Where R
11
is the sense resistor, and V
CLAMP
is the current
clamp at the inverting input of the PWM comparator. This
clamp is internally set to 5V. In actual application it is a
good idea to assume a value less than 5V to avoid
unwanted current limiting action due to component
tolerances. In this application V
CLAMP
was chosen as 4.8V.
Having calculated R
11
the value S
PWM
and of R
18
can
now be calculated:
S
V
mH
2
V
s
PWM
=
×
=
μ
380
20
100
80
0 225
.
/
R
R
×
A
S
R
C
R
k
14
×
k
nF
1
k
SC
PWM
T
T
18
9
18
6
2 5
.
2 5 28 8
(0 225 10
0 7
.
30
=
×
×
×
=
×
×
.
.
)
(16)
Choose R18 = 33k
The following values were used in the calculation:
R
9
= 27k
R
T
= 14k
A
SC
= 0.7
C
T
= 1nF
VOLTAGE REGULATION COMPONENTS
The values of the voltage regulation loop components are
calculated based on the operating output voltage. Note
that voltage safety regulations require the use of sense
resistors that have adequate voltage rating. As a rule of
thumb if 1/4W through-hole resistors are used, two of
them should be put in series. The input bias current of the
error amplifier is approximately 0.5
μ
A, therefore the
current available from the voltage sense resistors should
be significantly higher than this value. Since two 1/4W
resistors have to be used the total power rating is 1/2W.
The operating power is set to be 0.4W then with 380V
output voltage the value can be calculated as follows:
R
V
W
k
5
380
(
360
=
=
) /0 4
(17)
Choose two 178k
, 1% connected in series.
Then R6 can be calculated using the formula below:
R
V
V
R
V
V
380
k
5
V
V
k
REF
B
REF
6
5
5
356
4 747
.
=
×
=
×
=
(18)
Choose 4.75k
, 1%. One more critical component in the
voltage regulation loop is the feedback capacitor for the
error amplifier. The voltage loop bandwidth should be set
such that it rejects the 120Hz ripple which is present at
the output. If this ripple is not adequately attenuated it
will cause distortion on the input current waveform.
Typical bandwidths range anywhere from a few Hertz to
15Hz. The main compromise is between transient
response and distortion. The feedback capacitor can be
calculated using the following formula:
C
R
BW
C
k
Hz
2
F
8
5
8
1
3 142
.
1
3 142 356
.
0 44
.
=
×
×
=
×
=
μ
(19)
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