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參數(shù)資料
| 型號： | RN5RY202C-TR |
| 廠商： | RICOH COMPANY LTD |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | VFM STEP-UP DC/DC CONVERTER CONTROLLER |
| 中文描述： | 0.05 A SWITCHING CONTROLLER, PDSO5 |
| 封裝： | MINI, PLASTIC, SOT-23, 5 PIN |
| 文件頁數(shù)： | 9/9頁 |
| 文件大小： | 59K |
| 代理商： | RN5RY202C-TR |
NOTES ON OUTPUT VOLTAGE SETTINGS
RN5RY202
9
V
OUT
R
IC
GND
R
2
R
3
I
3
I
2
I
IC
2.0V
V
OUT
Output setting voltage is determined using the following formulas :
I
2
=I
IC
+I
3
..........................................................................................(1)
I
3
=2.0/R
3
........................................................................................(2)
From (1) and (2) above,
I
2
=I
IC
+2.0/R
3
..................................................................................(3)
V
OUT
=2.0+R
2
×
I
2
............................................................................(4)
By substituting (3) into the above formula
V
OUT
=2.0+R
2
×
(I
IC
+2.0/R
3
)
=2.0
×
(1+R
2
/R
3
)+R
2
×
I
IC
....................................................(5)
The second term, R
2
×
I
IC
in the formula (5) above may cause a voltage setting error.
Here, consider the formula in terms of I
IC
,
I
IC
=2.0/R
IC
.....................................................................................(6)
then R
2
×
I
IC
that causes the error will be as shown below :
R
2
×
I
IC
=R
2
×
2.0/R
IC
=2.0
×
R
2
/R
IC
......................................................................(7)
Thus, when R
2
<<R
IC
the error can be minimized.
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