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參數(shù)資料
| 型號： | SC415EVB |
| 廠商： | Semtech Corporation |
| 英文描述： | Dual Synchronous Buck Controller |
| 中文描述： | 雙同步降壓控制器 |
| 文件頁數(shù)： | 20/30頁 |
| 文件大?。?/td> | 942K |
| 代理商： | SC415EVB |
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SC415
20
Applications Information (continued)
Figure 14 shows example of this.
FB trip point
FB trip point
False trigger on FB
False trigger on FB
Idealized ESL ripple
Actual ripple with CBP
Figure 14
There are two ways to deal with this issue. One is to
use a larger ceramic capacitor, typically 2.2–10μF, which
significantly smooths the ripple waveform as shown in
Figure 15.
FB trip point
Actual ripple with
CB = (~2.2 – 10 uF)
Ripple from ESL
Figure 15
A second solution is to add a small RC filter in series
with the FB resistor path, shown by RF/CF. This RC filter
is intended to remove the high-frequency noise but still
allow the ripple to reach the FB pin as shown in Figure 16.
Recommended values are 10 ohms and 10nF.
R1
R2
To FB
CF
VOUT
RF
VOUT ripple
FB ripple
Figure 16
Dropout Performance
The VOUT adjust range for continuous-conduction
operation is limited by the fixed 330nsec (typical)
Minimum Off-time One-shot. When working with low
input voltages, the duty-factor limit must be calculated
using worst-case values for on and off times.
The IC duty-factor limitation is given by:
DUTY = TONMIN/(TONMIN + TOFFMAX)
Be sure to include inductor resistance and MOSFET on-
state voltage drops when performing worst-case dropout
duty-factor calculations.
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| SC4-1600/5A | 制造商:TE Connectivity 功能描述:SPLIT CORE CURRENT TRANSFORMER CASE 4 1600/5A |
| SC416EVB | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:Dual Synchronous Buck Controller with Tracking Start-up/Shutdown |
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