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STLD20D-DEF Datasheet(PDF) 18 Page - STMicroelectronics

Part # STLD20D-DEF
Description  White LED power supply
PDF  31 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STLD20D-DEF Datasheet(HTML) 18 Page - STMicroelectronics

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Components selection
STLD20D
18/31
In fact, in boost backlighting converter, the conduction losses (Pcond) lead by the forward
characteristics can be negligible compared to the losses induced by the reverse current
(Prev), especially at high temperature.
7.4
RLED feedback resistance selection
The average output current is regulated by sensing a low external ohmic sensing resistor
RLED. Thus, a constant current value is fixed for each LED whatever the ambient
temperature conditions. RLED is given by:
7.5
Efficiency
Efficiency is a significant parameter for the application. The higher the efficiency, the longer
the life time of the battery. The efficiency is given by:
.
R
LED
V
FB
I
LED
-----------
0.3V
20mA
----------------
15
Ω
7
[]
=
=
=
Efficiency
P
output
P
input
-------------------
NV
LED
I
LED
⋅
⋅
V
IN
I
input
⋅
--------------------------------------------
8
[]
=
=



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