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HM8116A データシート(PDF) 11 Page - Shenzhen Huazhimei Semiconductor Co., Ltd

部品番号. HM8116A
部品情報  Standoff 42V 1.2A 800KHz Sync Step-Down Regulator
ダウンロード  13 Pages
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メーカー  HMSEMI [Shenzhen Huazhimei Semiconductor Co., Ltd]
ホームページ  http://www.hmsemi.com/
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HM8116A Datasheet(HTML) 11 Page - Shenzhen Huazhimei Semiconductor Co., Ltd

 
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Standoff 42V 1.2A 800KHz Sync Step-Down Regulator
Where LLIM_AVG is the average start-up current during the soft-start period, and TSS is the soft- start time.
On the other hand, special attention should be paid when selecting these components. The DC bias of these
capacitors can result in a capacitance value that falls below the minimum value given in the recommended capacitor
specifications table.
The ceramic capacitor’s actual capacitance can vary with temperature. The capacitor type X7R, which operates over
a temperature range of −55°C to +125°C, will only vary the capacitance to within ±15%. The capacitor type X5R
has a similar tolerance over a reduced temperature range of −55°C to +85°C. Many large value ceramic capacitors,
larger than 1uF are manufactured with Z5U or Y5V temperature characteristics. Their capacitance can drop by more
than 50% as the temperature varies from 25°C to 85°C. Therefore, X5R or X7R is recommended over Z5U and
Y5V in applications where the ambient temperature will change significantly above or below 25°C.
Feed-Forward Capacitor (CFF)
HM8116A has internal loop compensation, so adding CFF is optional. Specifically, for specific applications, if
necessary, consider whether to add feed-forward capacitors according to the situation.
The use of a feed-forward capacitor (CFF) in the feedback network is to improve the transient response or higher
phase margin. For optimizing the feed-forward capacitor, knowing the cross frequency is the first thing. The cross
frequency (or the converter bandwidth) can be determined by using a network analyzer. When getting the cross
frequency with no feed-forward capacitor identified, the value of feed-forward capacitor (CFF) can be calculated
with the following Equation:
������������������������= 1
2���������������������������������������������������������1��������1�1��������1+1��������2�
Where FCROSS is the cross frequency.
To reduce transient ripple, the feed-forward capacitor value can be increased to push the cross frequency to higher
region. Although this can improve transient response, it also decreases phase margin and cause more ringing. In the
other hand, if more phase margin is desired, the feed-forward capacitor value can be decreased to push the cross
frequency to lower region.
HM8116A


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