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LM3552 データシート(PDF) 10 Page - Texas Instruments

部品番号 LM3552
部品情報  1A White LED Driver with Flash Timeout Protection
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ホームページ  http://www.ti.com
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LM3552 データシート(HTML) 10 Page - Texas Instruments

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LM3551, LM3552
SNVS371C – AUGUST 2005 – REVISED MARCH 2011
www.ti.com
Soft-Start
The LM3551 and LM3552 have a soft-start pin that can be used to limit the inductor inrush current on start-up.
The external SS pin is used to tailor the soft-start for a specific application but is not required for all applications
and can be left open when not needed. When used, a current source charges the external soft-start capacitor,
CSS, forcing the internal reference to ramp-up at a user determined rate.
Table 1. Typical Start-Up TimesVIN = 3.6V, TA = +25°C
CSS (µF)
Load (mA)
Start-Up Time (msec.)
Sharp LED @ 75mA Torch
3
Sharp LED @ 250mA Flash
8
0.1
Lumiled LED @ 200mA Torch
1.6
Lumiled LED @ 700mA Flash
6
Sharp LED @ 75mA Torch
12
Sharp LED @ 250mA Flash
35
0.47
Lumiled LED @ 200mA Torch
6
Lumiled LED @ 700mA Flash
35
Sharp LED @ 75mA Torch
25
Sharp LED @ 250mA Flash
75
1.0
Lumiled LED @ 200mA Torch
30
Lumiled LED @ 700mA Flash
70
10
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Product Folder Links: LM3551 LM3552


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