V
OUT
(100 mV/div)
V
IN
(10 V/div)
I
OUT
(1 A/div)
Time = 200 µs/div
V
OUT
(50 mV/div)
V
IN
(10 V/div)
I
OUT
(1 A/div)
Time = 200 µs/div
Output Current (A)
Ef
fic
ienc
y
(
%)
0.1
0.2
0.3 0.4 0.5
0.7
1
2
3
50
55
60
65
70
75
80
85
90
95
100
LM63
V
IN
= 12V
V
IN
= 24V
Output Current (A)
Ef
fic
ienc
y
(
%)
0.1
0.2
0.3 0.4 0.5
0.7
1
2
3
50
55
60
65
70
75
80
85
90
95
100
LM63
V
IN
= 12V
V
IN
= 24V
Operation
6
SNVU599A – February 2019 – Revised October 2019
Copyright © 2019, Texas Instruments Incorporated
LM63625EVM EVM User’s Guide
Advance Information
2
Operation
Once the above connections are made and the appropriate jumpers are set, the EVM is ready to use. The
EN pin is pulled up to VIN with a 100-k
Ω
resistor.
The output voltage of the EVM can be selected by the VOUT jumper to either 3.3 V or 5 V. Other values
of output voltage can be programmed by removing the jumper on J1 before powering on the device and
changing the value of R
FBT
and R
FBB
on the EVM. In addition, it is possible that the values of the inductor
and the output capacitance need to be changed. See the
LM636x5-Q1 3.5-V to 36-V, 1.5-A, and 2.5-A
Automotive Step-down Voltage Converter Data Sheet
for more information.
The EVM has been designed for maximum flexibility regarding component selection. This allows the user
to place preferred components such as the inductor, the capacitors, or both, on the board and test the
performance of the regulator. This way the power supply system can be tested before committing the
design to production.
3
Performance Curves
Figure 5. Efficiency Without Input Filter
AUTO Mode, V
OUT
= 3.3V, f
SW
= 2.1 MHz
Figure 6. Efficiency Without Input Filter
AUTO Mode, V
OUT
= 5 V, f
SW
= 2.1 MHz
Figure 7. Load Transient 12 V
IN
, 3.3 V
OUT
, 0 A to 1 A,
C
OUT
= 2 × 22 µF , I
OUT
Slew Rate = 1 A/µs
Figure 8. Load Transient 12 V
IN
, 3.3 V
OUT
, 0.1 A to 1 A,
C
OUT
= 2 × 22 µF, I
OUT
Slew Rate = 1 A/µs