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參數(shù)資料
| 型號： | LSP3128SD |
| 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 |
| 文件大小： | 342K |
| 代理商： | LSP3128SD |
Liteon Semiconductor Corporation
LSP3128
Wide Input 3A 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 4.8/(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:
Though CCOMP2 is unnecessary when the output capacitor has sufficiently low ESR, a small value CCOMP2 such
as 220pF 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
1.8V
22F Ceramic
4k
3.3nF
220pF
2.5V
22F Ceramic
5.6k
3.3nF
220pF
5V
22F Ceramic
12k
1.5nF
220pF
1.8V
100F SP CAP
15k
1.5nF
220pF
2.5V
100F SP CAP
15k
2.2nF
220pF
5V
100F SP CAP
15k
4.7nF
220pF
Table 2: Typical Compensation for Different Output voltages and Output Capacitors
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