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參數(shù)資料
| 型號(hào)： | LSP5503SEC |
| 廠商： | LITE-ON SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 4 A SWITCHING REGULATOR, 470 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | SOP-8 |
| 文件頁數(shù)： | 9/12頁 |
| 文件大?。?/td> | 475K |
| 代理商： | LSP5503SEC |
LSP5503
3A Synchronous Step Down DC/DC Converter
6 of 12
Rev. 1.8
The feedback loop of the IC is stabilized by the components at the COMP pin, as shown in Figure 2. The DC loop
gain of the system is determined by the following equation:
(4)
The dominant pole P1 is due to CCOMP:
COMP
VEA
EA
1
P
C
A
π
2
G
f
=
(5)
The second pole P2 is the output pole:
OUT
2
P
C
V
π
2
I
f
=
(6)
The first zero Z1 is due to RCOMP and CCOMP:
COMP
1
Z
C
R
π
2
1
f
=
(7)
And finally, the third pole is due to RCOMP and CCOMP2 (if CCOMP2 is used):
2
COMP
3
P
C
R
π
2
1
f
=
(8)
The following steps should be used to compensate the IC:
STEP1. Set the crossover frequency at 1/10 of the switching frequency via RCOMP:
(9)
but limit RCOMP to 10k maximum.
STEP2. Set the zero fZ1 at 1/4 of the crossover frequency. If RCOMP is less than 10k, the equation for CCOMP is:
)
F
(
R
10
8
.
1
C
COMP
5
COMP
×
=
(10)
If RCOMP is limited to 10k, then the actual crossover frequency is 10/ (VOUTCOUT). Therefore:
)
F
(
C
V
10
2
.
1
C
OUT
5
COMP
×
=
(11)
STEP3. If the output capacitor’s ESR is high enough to cause a zero at lower than 4 times the crossover frequency,
an additional compensation capacitor CCOMP2 is required. The condition for using CCOMP2 is:
ESRCOUT
R
)
(
V
012
.
0
,
C
10
1
.
1
Min
OUT
6
×
≥
(12)
And the proper value for CCOMP2 is:
COMP
ESRCOUT
OUT
2
COMP
R
C
=
(13)
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