ZXLD1371EST16TC Diodes Inc. / Zetex, ZXLD1371EST16TC Datasheet - Page 22

• Manufacturer Part Number: ZXLD1371EST16TC
• Description: MOSFET LED Controller TSSOP TSSOP-16EP T&R 2.5K
• Manufacturer: Diodes Inc. / Zetex

Specifications of ZXLD1371EST16TC

• Rohs: yes

ZXLD1371
Document number: DS35436 Rev. 1 - 2
Applications Information
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
Now I
Considering power dissipation and accuracy, it is useful to know how the mean sense voltage varies with input voltage and
other parameters.
This shows that the sense voltage varies with duty cycle in Boost and Buck-boost configurations.
LED
I
I
LED
LED
V
is dependent only on the 3 resistor values.
RS
= I
= I
=
RS
RS
0.225
R
R
1-D =
S
S
= 0.225
GI_ADJ
0.225
R
S
GI_ADJ
1-D
GI_ADJ
(Boost and Buck-boost)
(cont.)
V
V
ADJ
REF
V
V
ADJ
REF
(Boost and Buck-boost)
(Boost and Buck-boost)
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Equation 4
Equation 5
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February 2012
ZXLD1371