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參數(shù)資料
| 型號： | LX1910-CDUT |
| 廠商： | MICROSEMI CORP-ANALOG MIXED SIGNAL GROUP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 0.8 A SWITCHING REGULATOR, 1325 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | PLASTIC, MSOP-8 |
| 文件頁數(shù)： | 12/12頁 |
| 文件大?。?/td> | 602K |
| 代理商： | LX1910-CDUT |
LX1910
PRELIMINARY DATA SHEET
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 9
WWW
.Microse
m
i
.CO
M
High Frequency Step Down Regulator
I N T E GR A T ED
PRODUCT S
Copyright
2000
Rev. 0.9a, 2004-04-16
APPLICATION NOTE
F
11
.
3
)
m
5
.
1
mA
120
mV
5
(
MHz
1
8
mA
120
C
)
ESR
I
V
(
f
8
I
C
OUT
RIPPLE
OSC
RIPPLE
OUT
=
=
=
It is recommended that at least a 10F output capacitor be
used to ensure good transient response. Selecting this value
will guarantee that the maximum ripple voltage
specification is met.
Input Capacitor Calculation:
Bypass the input terminal of the LX1910 with a 4.7F
capacitor or larger.
Feedback Resistor Calculation:
Before the output voltage resistors are calculated, it should
be noted that a good starting value for the Thevinin
equivalent value of R1 and R2 (eq.7) is 73.2k. If this
value is maintained then the compensation components will
not need to be changed even if the output voltage
requirement is altered. Given eq. 5 and eq. 7:
2
1
2
1
2
1
R
k
100
R
1
V
17
.
1
V
5
.
2
+
=
+
=
By substitution R1 = 158k and R2 = 137k.
Compensation Components Calculation:
Next the compensation components are selected. Using
equations 8 and 11, the COMP pin components are
calculated as follows:
=
+
=
+
=
k
732
k
137
158
137
158
10
R
10
R
C
2
1
2
1
C
then
C
O
C
R
C
L
10
C
=
pF
100
pF
94
k
732
F
10
H
7
.
4
10
C
=
=
Next using equation 12 the CF capacitor is calculated as
follows:
22pF
pF
23
k
2
.
73
4
F
10
H
7
.
4
C
R
4
C
L
C
F
TH
O
F
=
=
=
The final step is to calculate the feed-forward resistor in
order to roll-off the system response using equation 13.
=
=
k
32
.
7
k
10
2
.
73
R
10
R
F
TH
F
AA
PP
LL
IICC
AA
TT
IIOO
NN
SS
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