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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)： | 24/34頁 |
| 文件大小： | 1131K |
| 代理商： | SC416MLTRT |
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SC416
24
Figure 18 shows examples of this.
FB trip point
FB trip point
False trigger on FB
False trigger on FB
Idealized ESL ripple
Actual ripple with CBP
Idealized ESL ripple
Figure 18
There are two ways to deal with this issue. One is to use
a larger ceramic capacitor, typically 2.2–10μF, which sig-
nificantly smooths the ripple waveform as shown in Fig-
ure 19.
Large CB (~2.2 – 10 uF)
FB trip point
Actual ripple with CBP
Ripple due to ESL
Figure 19
A second solution is to add a small RC filter in series with
the FB resistors, shown by RF/CF in Figure 20. This RC
filter is intended to remove the high-frequency noise but
still allow the ripple to reach the FB pin. Recommended
values are 10 ohms and 10nF.
R1
R2
To FB
CF
VOUT
RF
VOUT ripple
FB ripple
Figure 20
Dropout Performance
The VOUT adjust range for continuous-conduction op-
eration is limited by the fixed 330nsec (typical) Minimum
Off-time One-shot. When working with low input voltag-
es, 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 = TON
MIN
/ (TON
MIN
+ TOFF
MAX
)
Be sure to include inductor resistance and MOSFET on-
state voltage drops when performing worst-case drop-
out duty-factor calculations.
SC416 System DC Accuracy (VOUT Controller)
Three factors affect VOUT accuracy: the trip point of the
FB error comparator, the switching frequency variation
with line and load, and the external resistor tolerance.
The error comparator is trimmed to trip when the FB pin
is 750mV, +/-1% over the range of 0 to 85
°C
.
Applications Information (continued)
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| SC416MLTRT/KO | 制造商:Semtech Corporation 功能描述: |
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