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參數(shù)資料
| 型號： | SM8131B |
| 廠商： | Seiko NPC Corporation |
| 英文描述： | The SM8131B is a charge pump DC/DC converter that switches between 1 and 1.5 automatically. |
| 中文描述： | 該SM8131B是一個(gè)電荷泵DC / DC轉(zhuǎn)換器，1至1.5自動(dòng)切換。 |
| 文件頁數(shù)： | 14/21頁 |
| 文件大?。?/td> | 218K |
| 代理商： | SM8131B |
SM8131B
NIPPON PRECISION CIRCUITS INC.—14
VIN Input Voltage Range
The V
IN
minimum input voltage value to ensure rated drive current
fl
ows in each LED is determined by the
I
LED
setting (largest setting if divided into 2 groups), the total load current I
OUT
on pin VOUT, and the LED
forward-direction voltage drop
“
VF
”
, as given in the following equations:
(1) VF
≤
1.5
×
VIN
10
×
I
OUT
8
×
I
LED
(2) VIN
≥
(VF
+
10
×
I
OUT
+
8
×
I
LED
)/1.5
where 1.5 is the charge pump boost factor, 10 is the VOUT output impedance, and 8 is the LED drive circuit
internal resistance.
For example, if V
IN
=
3.5V, I
LED
=
20mA, and I
OUT
=
120mA, then VF is given by equation as follows:
1.5
×
3.5
10
×
0.12
8
×
0.02
=
3.89 [V]
Thus if LEDs with VF of 3.89V or lower rating at I
LED
=
20mA are used, the device will provide suf
fi
cient
drive current. If V
IN
falls and the drive LED VF exceeds the calculated value, V
IN
will take I
LED
down with it
below the required setting.
The relationship in equation is shown graphically for values of I
OUT
=
30/60/90/120mA.
V
IN
voltage and LED forward-direction voltage drop limit value
I
OUT
= 120mA
I
OUT
= 60mA
I
OUT
= 90mA
2.5
3.0
3.5
4.0
4.5
5.0
5.5
2.6
2.8
3.0
3.2
3.4
3.6
3.8
4.0
V
IN
[V]
L
I
OUT
= 30mA
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| SM8131B00B | 制造商:NPC 制造商全稱:Nippon Precision Circuits Inc 功能描述:The SM8131B is a charge pump DC/DC converter that switches between 1 and 1.5 automatically. |
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| SM8133B | 制造商:NPC 制造商全稱:Nippon Precision Circuits Inc 功能描述:White LED Driver IC |
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