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參數(shù)資料
| 型號： | LTC1530IS8-3.3 |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Isolated Flyback Switching Regulator with 9V Output |
| 中文描述： | SWITCHING CONTROLLER, 350 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | 0.150 INCH, PLASTIC, SO-8 |
| 文件頁數(shù)： | 15/24頁 |
| 文件大?。?/td> | 288K |
| 代理商： | LTC1530IS8-3.3 |
15
LTC1530
Although a mathematical approach to frequency compen-
sation can be used, the added complication of input and/
or output filters, unknown capacitor ESR, and gross
operating point changes with input voltage, load current
variations and frequency of operation all suggest a more
practical empirical method. This can be done by injecting
a transient current at the load and using an RC network box
to iterate toward the final compensation values or by
obtaining the optimum loop response using a network
analyzer to find the actual loop poles and zeros.
Table 2 shows the suggested compensation components
for 5V input applications based on the inductor and output
capacitor values. The values were calculated using mul-
tiple paralleled 330
μ
F AVX TPS series surface mount
tantalum capacitors for the output capacitor. The opti-
mum component values might deviate from the suggested
values slightly because of board layout and operating
condition differences.
Table 2. Suggested Compensation Network for a 5V Input
Application Using Multiple Paralleled 330
μ
F AVX TPS Output
Capacitors for 2.5V Output
L
O
(
μ
H)
1
1
1
2.7
2.7
2.7
5.6
5.6
5.6
C
O
(
μ
F)
990
1980
4950
990
1980
4950
990
1980
4950
R
C
(k
)
1.3
2.7
6.8
3.6
7.5
18
7.5
15
36
C
C
(
μ
F)
0.022
0.022
0.01
0.022
0.01
0.01
0.01
0.01
0.0047
C1 (pF)
1000
470
220
330
220
68
220
100
47
An alternate output capacitor is the Sanyo MV-GX series.
Using multiple paralleled 1500
μ
F Sanyo MV-GX capaci-
tors for the output capacitor, Table 3 shows the suggested
compensation components for 5V input applications based
on the inductor and output capacitor values.
Table 3. Suggested Compensation Network for a 5V Input
Application Using Multiple Paralleled 1500
μ
F SANYO MV-GX
Output Capacitors for 2.5V Output
L
O
(
μ
H)
1
1
1
2.7
2.7
2.7
5.6
5.6
5.6
C
O
(
μ
F)
4500
6000
9000
4500
6000
9000
4500
6000
9000
R
C
(k
)
3
4
6
8.2
11
16
16
22
33
C
C
(
μ
F)
0.022
0.022
0.022
0.022
0.01
0.01
0.01
0.01
0.01
C1 (pF)
470
330
220
150
100
100
100
68
47
Note: For different values of V
OUT
, multiply the R
C
value by V
OUT
/2.5 and
multiply the C
C
and C1 values by 2.5/V
OUT
. This maintains the same
crossover frequency for the closed-loop transfer function.
C1
R
C
C
C
LTC1530
V
OUT
3
COMP
4
1530 F08a
+
–
ERR
BG
Figure 8a. Compensation Pin Hook-Up
L
FREQUENCY
1530 F08b
–20dB/DECADE
f
SW
= LTC1530 SWITCHING FREQUENCY
f
CO
= CLOSED-LOOP CROSSOVER FREQUENCY
f
Z
f
LC
f
ESR
f
CO
f
P
Figure 8b. Bode Plot of the LTC1530 Overall
Transfer Function
APPLICATIOU
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U
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