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參數(shù)資料
| 型號： | LSP3129SD |
| 廠商： | LITE-ON SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING REGULATOR, PDSO8 |
| 封裝： | SOP-8 |
| 文件頁數(shù)： | 7/10頁 |
| 文件大?。?/td> | 334K |
| 代理商： | LSP3129SD |
Liteon Semiconductor Corporation
LSP3129
Wide Input 2A Step Down Converter
Rev1.0
6/10
And finally, the third pole is due to RCOMP and CCOMP2 (if CCOMP2 is used):
Follow the following steps to compensate the IC:
STEP1. Set the cross over frequency at 1/10 of the switching frequency via RCOMP:
but limit RCOMP to 15k maximum.
STEP2. Set the zero fZ1 at 1/4 of the cross over frequency. If RCOMP is less than 15k, the equation for CCOMP is:
If RCOMP is limited to 15k, then the actual cross over frequency is 3.4/(VOUTCOUT). Therefore:
STEP3. If the output capacitor’s ESR is high enough to cause a zero at lower than 4 times the cross over
frequency, an additional compensation capacitor CCOMP2 is required. The condition for using CCOMP2 is:
And the proper value for CCOMP2 is:
A small value CCOMP2 such as 100pF may improve stability against PCB layout parasitic effects.
Table 2 shows some calculated results based on the compensation method above.
VOUT
COUT
RCOMP
CCOMP
CCOMP2
2.5V
22F Ceramic
8.2k
2.2nF
100pF
3.3V
22F Ceramic
12k
1.5nF
100pF
5V
22F Ceramic
15k
1.5nF
100pF
2.5V
47F SP CAP
15k
1.5nF
100pF
3.3V
47F SP CAP
15k
1.8nF
100pF
5V
47F SP CAP
15k
2.7nF
100pF
2.5V
470F/6.3V/30m
15k
15nF
1nF
3.3V
470F/6.3V/30m
15k
22nF
1nF
5V
470F/6.3V/30m
15k
27nF
1nF
Table 2: Typical Compensation for Different Output voltages and Output Capacitors
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