Texas Instruments LM63635EVM, Руководство пользователя

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Output Current (A)
Ef
fic
ienc
y
(%
)
0.001 0.01 0.1 1 5 5
65
70
75
80
85
90
95
eff_
8V
13.5V
18V
24V
Output Current (A)
Ef
fic
ie
nc
y
(%
)
0.001 0.01 0.1 1 5 5
70
75
80
85
90
95
100
eff_
8V
13.5V
18V
24V
Operation
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6 SNVU617 – January 2020
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Copyright © 2020, Texas Instruments Incorporated
LM63635EVM 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
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.
To us the RESET function, a pullup resistor is required. A place for this resistor is provided on the bottom
of the PCB. 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.
The EVM is equipped with several EMI filter options. These are accessed through the edge connector as
shown in
Figure 2 . Refer to Figure 2 , Figure 7 , and Table 2 for details.
Loop gain measurements can be made using the setup shown in Figure 4 .
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
= 400 KHz
Figure 6. Efficiency Without Input Filter
AUTO Mode, V
OUT
= 5 V, f
SW
= 400 KHz