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參數(shù)資料
| 型號： | 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-調光技術 |
| 文件頁數(shù)： | 3/6頁 |
| 文件大?。?/td> | 230K |
| 代理商： | AN47 |
AN47
Issue 1 - August 2006
Zetex Semiconductors plc 2006
3
www.zetex.com
DC voltage dimming
The ADJ pin can be overdriven by an external DC voltage (V
ADJ
), as shown, in order to override
the internal voltage reference and adjust the output current to a value above or below the nominal
value.
GND
ZXLD1350
ADJ
GND
+
DC
The nominal output current is then given by:
I
OUT
0.08
--------------------------------
V
×
R
S
≈
[for 0.3< V
ADJ
<2.5V]
Note that 100% brightness setting corresponds to V
ADJ
= V
REF
.
If V
IN
is 2.5V max the R
SENSE
should be increased by 2X R
S
. This will slightly decrease the
efficiency by 1 to 2% .
The input impedance of the ADJ pin is 200k ±20%. This may be factor if the DC voltage with a
relatively high output resistance.
I
OUT
vs V
ADJ
(R
S
=300m )
0
50
100
150
200
250
300
350
0
0.25
0.5
0.75
1
1.25
V
m
Series1
Figure 1 Typical output current versus ADJ voltage with R
S
= 300m
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