Texas Instruments LM63625QDRREVM, Руководство пользователя, Страница: 6 / 17

Output Current (A)
Efficiency
(%)
0.001 0.01 0.1 1 5 5
40
45
50
55
60
65
70
75
80
85
90
95
100
DRR_
8V
13.5V
18V
24V
Output Current (A)
Efficiency
(%)
0.001 0.01 0.1 1 5 5
40
45
50
55
60
65
70
75
80
85
90
95
100
DRR_
8V
13.5V
18V
24V
Operation
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6 SNVU702 – February 2020
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LM63625QDRREVM EVM User’s Guide
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 k
Ω . Values
for R
FBT
and R
FBB
are then selected and populated in the designated locations. 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 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 k
Ω
to 100 k
Ω
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 Figure 5 .
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 6. Efficiency
AUTO Mode, V
OUT
= 3.3 V, f
SW
= 2100 KHz
Figure 7. Efficiency Without Input Filter
AUTO Mode, V
OUT
= 5 V, f
SW
= 2100 KHz