Operation
2-3
Setup
2.3
Operation
The EVM has been optimized to operate from a 2-cell NiCad, NiMH, and
alkaline battery with input voltage range down to 1.8V. The output voltage is
set to 5.0V and is capable of supplying 1A. After connecting the input and
output connections, and setting the SYNC jumper (JP1) to the desired
setting, turn on the input supply and then enable the output as desired with
JP2.
The resistor divider on the LBI pin is designed to trip the LBO output when
the input supply voltage drops below 1.8V.
Efficiency may vary depending on the inductor used in the design.
Generally, smaller size inductors decrease the efficiency in the design.
Figure 2−1 shows the efficiency versus I
OUT
curve for the TPS61030EVM.
Figure 2−1. Efficiency vs I
OUT
for the TPS61030EVM
0
100
90
80
70
60
50
40
30
20
10
1
10
100
1000
10000
Output Current (mA)
Ef
fi
ci
e
n
c
y
V
IN
= 2.4
V
IN
= 3.3
Figure 2−2 shows the typical maximum output current versus input voltage for
this EVM.
Figure 2−2. Maximum Output Current vs V
BAT
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
Input Voltage, V
BAT
(V)
M
a
x
im
u
m
O
u
tp
u
t
C
u
rre
n
t
(A
)
1.8
2.2
2.6
3.0
3.4
3.8
4.2
4.6
5.0