SLUU381B
September 2009 – February 2022
TPS51220A
Trademarks
1
Introduction
2
Description
2.1
Typical Applications
2.2
Features
3
Electrical Performance Specifications
4
Schematic
5
Test Setup
5.1
Test Equipment
5.2
Recommended Test Setup
5.3
List of Test Points
6
Test Procedure
6.1
Line/Load Regulation and Efficiency Measurement Procedure
6.2
Output Ripple Test
6.3
Measuring Improved Light Load Efficiency
6.4
Control Architecture and OVP Select
6.5
Overcurrent Trip Level and Output Discharge Select
7
Performance Data and Typical Characteristic Curves
7.1
Efficiency
7.2
Load Regulation
7.3
Bode Plot
7.4
Transient Response
7.5
Output Ripple and Switch Node
7.6
Turn-On Waveform
7.7
Turn-Off Waveform
8
EVM Assembly Drawing and PCB Layout
9
List of Materials
10
Revision History
6.2
Output Ripple Test
Use steps 1 to 6 of
Section 6.1
to start output.
Set up the scope as follows:
HORIZONTAL SWEEP: 2 μs/div
TRIGGER MODE: auto, rising edge
TRIGGER SOURCE: Ch1
CH1: 50 mV/div, AC coupled, bandwidth 20 MHz
Use the tip and barrel technique shown in
Figure 5-2
to probe VOUT1 and VOUT2 during test procedure.