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参数资料
| 型号： | LSP3128SAD |
| 厂商： | LITE-ON SEMICONDUCTOR CORP |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING REGULATOR, PDSO8 |
| 封装： | SOP-8 |
| 文件页数： | 6/10页 |
| 文件大小： | 342K |
| 代理商： | LSP3128SAD |
Liteon Semiconductor Corporation
LSP3128
Wide Input 3A Step Down Converter
Rev1.0
5/10
Input Capacitor
The input capacitor needs to be carefully selected to maintain sufficiently low ripple at the supply input of the
converter. A low ESR capacitor is highly recommended. Since a large current flows in and out of this capacitor
during switching, its ESR also affects efficiency.
The input capacitance needs to be higher than 10F. The best choice is the ceramic type, however, low ESR
tantalum or electrolytic types may also be used provided that the RMS ripple current rating is higher than 50% of the
output current. The input capacitor should be placed close to the IN and G pins of the IC, with shortest possible
traces. In the case of tantalum or electrolytic types, they can be further away if a small parallel 0.1F ceramic ca-
pacitor is placed right next to the IC.
Output Capacitor
The output capacitor also needs to have low ESR to keep low output voltage ripple. The output ripple voltage is:
where IOUTMAX is the maximum output current, KRIPPLE is the ripple factor, RESR is the ESR resistance of the output
capacitor, fSW is the switching frequency, L is the inductor value, COUT is the output capacitance.
In the case of ceramic output capacitors, RESR is very small and does not contribute to the ripple. Therefore, a lower
capacitance value can be used for ceramic type, typically choose a capacitance of about 22F.
In the case of tantalum or electrolytic type, the ripple is dominated by RESR multiplied by the ripple current. In that
case, the output capacitor is chosen to have sufficiently low due to ESR, typically choose a capacitor with less than
50m ESR.
Rectifier Diode
Use a Schottky diode as the rectifier to conduct current when the High-Side Power Switch is off. The Schottky diode
must have current rating higher than the maximum output current and the reverse voltage rating higher than the
maximum input voltage.
Stability Compensation
CCOMP2 is needed only for high ESR output capacitor
Figure 2: Stability compensation
The feedback system of the IC is stabilized by the components at COMP pin, as shown in Figure 2. The DC loop
gain of the system is determined by the following equation:
The dominant pole P1 is due to CCOMP
The second pole P2 is the output pole:
The first zero Z1 is due RCOMP and CCOMP
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