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參數(shù)資料
| 型號： | SC416MLTRT |
| 廠商： | Semtech Corporation |
| 英文描述： | Dual Synchronous Buck Controller with Tracking Start-up/Shutdown |
| 中文描述： | 雙同步降壓控制器跟蹤Start-up/Shutdown |
| 文件頁數(shù)： | 22/34頁 |
| 文件大?。?/td> | 1131K |
| 代理商： | SC416MLTRT |
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SC416
22
The schematic with added capacitor C is shown below.
R1
R2
To FB
C
COUT
VOUT
Figure 14
This capacitor should be left out until confirmation that
double-pulsing exists. It is best to leave a spot on the
PCB in case it is needed.
FB/VOUT Ripple
Because the constant on-time control method triggers a
DH pulse whenever the FB waveform reaches the 750mV
trip point, it is important that the VOUT and FB ripple
waveforms are well shaped. This waveform will depend
on the output capacitors.
The idealized case for the output filter has an inductor
and a capacitor COUT with series ESR. The voltage ripple
due to charging and discharging COUT is typically much
smaller than the ripple voltage due to ESR, so the over-
all ripple waveform is generally determined by ESR only.
The result is a well-defined sawtooth, see Figure 15.
Applications Information (continued)
Figure15
In many applications, the output capacitor also has some
series inductance (ESL), and this can have a large effect
on ripple. The ripple current creates voltage across the
ESL; this is a square wave similar to the LX waveform. The
result is shown below. Note the fast rising and falling
edges created by the ESL.
R1
R2
To FB
COUT
VOUT
LOAD
LX
ESR
Inductor Ripple
Current
VOUT ripple
from ESR
FB ripple
750 mV
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| SC416MLTRT/KO | 制造商:Semtech Corporation 功能描述: |
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| SC417_09 | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:10A Integrated FET Regulator with Programmable LDO |
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