LMR51420EVM User's Guide
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1 Introduction
The Texas Instruments LMR51420EVM evaluation module (EVM) helps designers evaluate the operation and performance of the LMR51420 wide-input buck regulator.
Figure 1-1 LMR51420EVM
Board1.1 Description
The Texas Instruments LMR51420EVM evaluation module (EVM) helps designers evaluate the operation and performance of the LMR51420 wide-input buck regulator.
1.2 Features
- 4.5-V to 36-V input voltage range
- Default 5-V output
- Up to 2-A output current
- 500-kHz switching frequency
- Hiccup mode short current protection
- Internal compensation
The EVM contains one DC/DC converter (see Table 1-1).
| CONVERTER | EVM | DEVICE | PACKAGE |
|---|---|---|---|
| U1 | LMR51420EVM | PLMR51420 | SOT23-6 |
2 EVM Setup
This section describes the jumpers and connectors on the EVM and how to properly connect, set up, and use the LMR51420EVM.
-
VIN – Terminal TP1
Power input terminal for the converter. Adjacent to it is the GND reference
ground. Use this terminal to attach the EVM to a cable harness.
-
VOUT – Terminal TP3
Regulated output voltage for the converter. Adjacent to it is the GND reference
ground.
-
GND – Terminal TP2, TP4
Ground reference for the converter. Use these terminals to attach the EVM to a
cable harness.
-
VOUT SETTING – Jumper JP1
Used to set output voltage to 5-V or 3.3-V output
-
ENABLE SETTING – Jumper JP3
Used to enable the switch-mode converter. The device will be enabled when the EN
pin is high, and disabled when low.
Figure 2-1 Vout Jumper
Setting 
Figure 2-2 Enable Jumper Setting-
Jumper J2
Test points used for loop response measurements
-
Jumper J4
Replacing J4 by wire can use current scope to test the inductor current
2.1 Ajusting the Output Voltage
If other outputs need to be configured, leave jumper J1 unconnected and adjust the feedback resistors using the Equation 1.
where
- VREF is 0.6 V
