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參數(shù)資料
| 型號： | 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)： | 10/12頁 |
| 文件大?。?/td> | 475K |
| 代理商： | LSP5503SEC |
LSP5503
3A Synchronous Step Down DC/DC Converter
7 of 12
Rev. 1.8
Though CCOMP2 is unnecessary when the output capacitor has sufficiently low ESR, a small value CCOMP2 such as
100pF may improve stability against PCB layout parasitic effects.
Table 3 shows some calculated results based on the compensation method above.
VOUT
COUT
RCOMP
CCOMP
CCOMP2
1.0V
22F Ceramic
1.5k
10nF
100pF
1.2V
22F Ceramic
1.7k
10nF
100pF
1.8V
22F Ceramic
2.2k
6.8nF
100pF
2.5V
22F Ceramic
3.6k
4.7nF
100pF
3.3V
22F Ceramic
4.7k
3.3nF
47pF
5V
22F Ceramic
6.8k
2.2nF
47pF
1.0V
47F SP Cap
3.0k
6.8nF
470pF
1.2V
47F SP Cap
3.6k
4.7nF
330pF
1.8V
47F SP Cap
5.6k
3.3nF
220pF
2.5V
47F SP Cap
6.8k
2.2nF
200pF
3.3V
47F SP Cap
10k
2.0nF
150pF
5V
47F SP Cap
10k
2.2nF
150pF
1.0V
470F/6.3V/30m
10k
2.2nF
1nF
1.2V
470F/6.3V/30m
10k
3.3nF
1nF
1.8V
470F/6.3V/30m
10k
4.7nF
1nF
2.5V
470F/6.3V/30m
10k
6.8nF
1nF
3.3V
470F/6.3V/30m
10k
8.2nF
1nF
5V
470F/10V/30m
10k
10nF
1nF
Table3. Typical Compensation for Different Output Voltages and Output Capacitors
VIN = 12V
VOUT= 5V/3A
LSP5503
IN
EN
FB
SW
GND
C1
C2
0.1F
C5
47pF
L1
C6
10nF
44.2k
R2
10k
R3
6.8k
COMP
R4
100k
BS
R1
C4
2.2nF
2
7
3
5
1
8
6
SS
0.1F
C3
4
10H/3A
22F/16V
C7
22F/16V
x2
Figure 3 shows a sample LSP5503 application circuit generating 5V/3A output.
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