参数资料
型号: ZXLD1371QESTTC
厂商: Diodes Inc
文件页数: 22/42页
文件大小: 0K
描述: IC LED DRIVER
特色产品: ZXLD1371 LED Driver Controller
标准包装: 1
系列: *
其它名称: ZXLD1371QESTTCDIDKR
A Product Line of
Diodes Incorporated
ZXLD1371
Applications Information (cont.)
I LED = I RS 1-D =
0.225
R S
GI_ADJ
V ADJ
V REF
(Boost and Buck-boost)
Equation 4
This shows that the LED current depends on the ADJ pin voltage, the reference voltage and 3 resistor values (RS, RGI1
and RGI2). It is independent of the input and output voltages.
If the ADJ pin is connected to the REF pin, this simplifies to
I LED =
0.225
R S
GI_ADJ
(Boost and Buck-boost)
Now I LED is dependent only on the 3 resistor values.
Considering power dissipation and accuracy, it is useful to know how the mean sense voltage varies with input voltage and
other parameters.
V RS = I RS R S = 0.225
GI_ADJ
1-D
V ADJ
V REF
(Boost and Buck-boost)
Equation 5
This shows that the sense voltage varies with duty cycle in Boost and Buck-boost configurations.
ZXLD1371
Document number: DS35436 Rev. 1 - 2
22 of 42
www.diodes.com
February 2012
? Diodes Incorporated
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