Datasheet

( )
OUT REF
R1
V V 1 V
R2
æ ö
= ´ +
ç ÷
è ø
1
2
3
4
16
15
14
13
PVDD2
BOOT2
SW2
PGND2
PVDD1
BOOT1
SW1
PGND1
TPS54290
5
6
7
12
11
10
BP
GND
FB2
EN1
EN2
FB1
R1
V
OUT1
R2
UDG-09131
8 9COMP1 COMP2
IN OUT
OUT
V V
L
I
-
=
D
TPS54290, TPS54291, TPS54292
SLUS973 –OCTOBER 2009 www.ti.com
OUTPUT VOLTAGE REGULATION
The regulation output voltage is determined by a resistor divider connecting the output node, the FBx pin, and
GND (Figure 14). The value of the output voltage is shown in Equation 2.
(2)
where
• V
REF
is the internal 0.8-V reference voltage
Figure 14. Feedback Network for Channel1
INDUCTOR SELECTION
Equation 3 calculates the inductance value so that the output ripple current falls from 20% to 40% of the full load
current.
(3)
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