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參數(shù)資料
| 型號： | R1211N002B |
| 廠商： | Ricoh Co., Ltd. |
| 英文描述： | STEP-UP DC/DC CONTROLLER |
| 中文描述： | 升壓型DC / DC控制器 |
| 文件頁數(shù)： | 11/40頁 |
| 文件大小： | 385K |
| 代理商： | R1211N002B |
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R1211x
11
When I
OUT
becomes more than formula 5, the current flows through the inductor, then the mode becomes
continuous. The continuous current through the inductor is described as Iconst, then,
{
}
IN
IN
OUT
ON
IN
OSC
OUT
Iconst/V
V
)
V
(V
L
2
/
T
V
f
I
×
+
×
×
×
×
=
In this moment, the peak current, ILxmax flowing through the inductor and the driver Tr. is described as
follows:
/L
T
V
Iconst
ILxmax
ON
+
=
.................................................................................................................Formula 7
With the formula 4,6, and ILxmax is,
L)
/(2
T
V
I
/V
V
ILxmax
ON
IN
OUT
IN
OUT
×
×
+
×
=
..............................................................................................Formula 8
Therefore, peak current is more than I
OUT
. Considering the value of ILxmax, the condition of input and output,
and external components should be selected.
In the formula 7, peak current ILxmax at discontinuous mode can be calculated. Put Iconst
=
0 in the formula.
The explanation above is based on the ideal calculation, and the loss caused by Lx switch and external
components is not included. The actual maximum output current is between 50% and 80% of the calculation.
Especially, when the ILx is large, or V
IN
is low, the loss of V
IN
is generated with the on resistance of the switch. As
for V
OUT
, Vf (as much as 0.3V) of the diode should be considered.
OUT
2
2
...............................................................Formula 6
IN
×
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| R1211N002B-TR | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog IC |
| R1211N002C | 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:STEP-UP DC/DC CONTROLLER |
| R1211N002C-TR | 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:Step-up DC/DC Controller |
| R1211N002D | 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:STEP-UP DC/DC CONTROLLER |
| R1211N002D-TR | 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:Step-up DC/DC Controller |
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