Table of Contents
Advertisement
Operation
2
Operation
Once the above connections are made and the appropriate jumpers are set, the EVM is ready to use.
The output voltage of the EVM can be selected by the VSEL jumper to either 3.3 V or 5 V. EN must be
cycled when the jumper is changed, in order for the selection to be programmed. Other values of output
voltage can be set by removing the VSEL jumper and populating Radj (on bottom) with a 10 kΩ. Values
for R
and R
are then selected and populated in the designated locations. See the
FBT
FBB
to 36-V, 1.5-A, and 2.5-A Automotive Step-down Voltage Converter Data Sheet
The switching mode of the EVM can be changed by using the SYNC/MODE jumper; this selection can be
made "on-the-fly".
To use the RESET function, a pullup resistor is required. A place for this resistor is provided on the bottom
of the PCB (RPU). Values of 10 kΩ to 100 kΩ are appropriate. Be sure to limit the voltage on this pullup to
less than the specified Abs max for this pin.
Some components in the EMI filter are not populated. The user is free to experiment with different EMI
filter components as desired.
Loop gain measurements (Bode plots) can be made using the setup shown in
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
100
95
90
85
80
75
70
65
60
55
50
45
40
0.001
0.01
Figure 6. Efficiency
AUTO Mode, V
6
LM63625QDRREVM EVM User's Guide
0.1
1
Output Current (A)
= 3.3 V, f
= 2100 KHz
OUT
SW
Copyright © 2020, Texas Instruments Incorporated
100
95
90
85
80
75
70
65
60
55
8V
50
13.5V
18V
45
24V
40
5 5
0.001
0.01
DRR_
Figure 7. Efficiency Without Input Filter
AUTO Mode, V
www.ti.com
LM636x5-Q1 3.5-V
for more information.
Figure
5.
0.1
1
Output Current (A)
= 5 V, f
= 2100 KHz
OUT
SW
SNVU702 – February 2020
Submit Documentation Feedback
8V
13.5V
18V
24V
5 5
DRR_
Advertisement
Table of Contents
