Datasheet

V
RAIL(peak)
is the highest output voltage
that the power converter needs to
deliver.
I
LEDx
is the forward current of an LED
string.
Determine:
I
LEDx
, V
RAIL(peak)
and V
RAIL(nom)
Prepare a power converter which has a
maximum output power > P
OUT(nom)
and a
maximum output voltage > V
RAIL(peak)
Adjust R
1
and R
2
to reduce the nominal
output voltage of the power converter to
V
RAIL(nom)
Begin power
supply selection
The power converter must be able to
deliver a power no less than P
RAIL(peak)
even if the V
RAIL
is pushed to the
maximum by the LM3463, V
RAIL(peak)
REMARKSPROCEDURES
Adjust the value of R
1
and R
2
so as to
meet the equation:
V
FB
R
2
V
RAIL(nom)
=
Calculate the required maximum output
Power, P
RAIL(peak)
of the power supply
End of power
supply selection
I
LEDx
No. of
output ch.
P
RAIL(peak)
=
V
RAIL(peak)
R
1
+ R
2
2.5V
To control circuit of
primary power supply
V
FB
R
1
R
2
V
RAIL
GND
OutP
VIN
GND REFRTN
R
DHC
Primary power supply
LM3463
R
FB1
R
FB2
VLedFB
LM3463
SNVS807A –MAY 2012–REVISED MAY 2013 www.ti.com
Figure 27. Connecting the LM3463 to a power supply
Figure 28. Procedures of selecting the primary power supply
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