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參數(shù)資料
| 型號(hào)： | AN47 |
| 廠商： | Zetex Semiconductor |
| 英文描述： | Getting more out of the ZXLD1350 - dimming techniques |
| 中文描述： | 獲取更多的ZXLD1350的-調(diào)光技術(shù) |
| 文件頁數(shù)： | 4/6頁 |
| 文件大?。?/td> | 230K |
| 代理商： | AN47 |
I
OUT
vs V
ADJ
(R
S
=600m )
0
50
100
150
200
250
300
350
0
0.5
1
1.5
2
2.5
V
m
Series1
AN47
www.zetex.com
4
Issue 1 - August 2006
Zetex Semiconductors plc 2006
Figure 2 Typical output current versus ADJ voltage with R
S
= 600m
GND
ZXLD1350
ADJ
ZTLV431
VR1
10k
R1
4.7k
V
IN
Figure 3 Typical circuit of DC voltage dimming
The ZTLV431 acts as a shunt regulator to generate an external 1.25V reference voltage. The
reference voltage is applied to pot VR1 to provide dimming voltage of 0-1.25V.
Using an external regulator affects the accuracy of the current setting. If a 1% reference is used
the LED current will be more accurate than using the internal reference.
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