SLVU445C
March 2011 – August 2021
TPS56121
Trademarks
1
Introduction
2
Description
2.1
Applications
2.2
Features
3
Electrical Performance Specifications
4
Schematic
5
Test Setup
5.1
Test Equipment
5.1.1
Voltage Source
5.1.2
Meters
5.1.3
Load
5.1.4
Oscilloscope
5.1.5
Fan
5.2
Recommended Wire Gauge
5.2.1
VIN to J1
5.2.2
J2 to LOAD
5.3
Equipment Set Up Procedure
6
Configurations
6.1
Enable Selection (J3)
7
Test Point Descriptions
7.1
Input Voltage Monitoring (TP1 and TP2)
7.2
Output Voltage Monitoring (TP3 and TP4)
7.3
Enable/Soft-start Monitoring (TP5)
7.4
Power Good Monitoring (TP6)
7.5
Loop Response Testing (TP7, TP8, TP9 and TP10)
7.6
Switch Node Voltage Monitoring (TP11 and TP12)
8
Test Procedures
8.1
Start Up/Shut Down Procedure
8.2
Output Ripple Voltage Measurement Procedure
8.3
Control Loop Gain and Phase Measurement Procedure
8.4
Equipment Shutdown
9
Performance Data and Typical Characteristic Curves
9.1
Efficiency
9.2
Load Regulation
9.3
Line Regulation
9.4
Output Voltage Ripple
9.5
Switch Node
9.6
Load Transient
9.7
Start Up
9.8
Power Off
9.9
Over-Current Protection
9.10
Control Loop Bode Plot
9.11
Thermal Image
10
EVM Assembly Drawings and PCB Layout
11
List of Materials
12
Revision History
5.1.2
Meters
A1:
Input current meter (0 A
DC
to 2.5 A
DC
).
V1:
Input voltage meter (0 V to 15 V).
V2:
Output voltage meter (0 V to 2 V).