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Operation
2 Operation
Once the above connections are made and the appropriate jumpers are set, the EVM is ready to use.
The EVM is configured for a 5-V output, when used with the devices so noted in
can be changed by changing the values of resistors R2 (R
capacitors and the desired loop performance, a feed-forward capacitor, C5 (C
available on the EVM for this optional component.
When using the devices in
(R2) must be populated with a zero Ohm resistor, and R
The mode of operation is determined by the setting of the MODE jumper and the particular device option.
Not all modes are available on all device options. Refer to the relevant data sheet for more details.
See the LM63635 and LM63635C data sheets for more information.
The RESET flag is used to indicate when the output voltage is within +/- 5 % of the regulated value. This EVM is
configured with a 100 kΩ pull-up resistor from RESET to VCC (about 5V). A low on RESET indicates the output
voltage is out of regulation. The pull-up resistor can be removed and the open-drain RESET pin can be used to
control a system processor from the EVM. Be sure to limit the voltage on the RESET 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
Curves showing typical performance data are found in
other data, consult the device data sheet.
95
90
85
80
75
70
65
60
0
0.5
1
Output Current (A)
Figure 3-1. Efficiency: AUTO Mode, V
= 2100 kHz
6
LM63635DNEVM Evaluation Module
Table 1-1
listed as fixed, the output voltage is set by the device. In this case, R
8V
13.5V
18V
24V
1.5
2
2.5
3
= 5 V, f
OUT
SW
Copyright © 2024 Texas Instruments Incorporated
) and/or R3 (R
). Depending on the output
FBT
FBB
) can be desirable. A space is
FF
(R3) must be open.
FBB
Note
Figure
Figure
3-1and
Figure
3-2. For other conditions and/or
5.05
5.04
5.03
5.02
5.01
5
0
0.5
Figure 3-2. Line and Load Regulation: AUTO Mode,
V
= 5 V, f
OUT
SNVU767A – MARCH 2022 – REVISED JANUARY 2024
www.ti.com
Table
1-1. The output voltage
FBT
1-4.
8V
13.5V
18V
24V
1
1.5
2
2.5
Output Current (A)
= 2100 kHz
SW
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3
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