Datasheet

10
9
8
7
VDD
BP
ISNS
GDRV
TPS40210/11
L
V
IN
UDG-07197
6GND
R
IFB
1
2
3
4
5
RC
SS
COMP
DIS/EN
FB
I
OUT
FB
IFB
OUT
V
R
I
=
TPS40210-Q1, TPS40211-Q1
SLVS861D –AUGUST 2008–REVISED APRIL 2010 www.ti.com
Figure 29. Typical LED Drive Schematic
The current in the LED string is set by the choice of the resistor R
ISNS
as shown in Equation 31.
where
• R
IFB
is the value of the current sense resistor for the LED string in Ω.
• V
FB
is the reference voltage for the TPS40211 in V (0.260 V typ).
• I
OUT
is the desired DC current in the LED string in A. (31)
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