1 Introduction
This EVM utilizes Texas Instrument’s TPS51220A in a dual output design. The device includes many test points
to help the engineer monitor and evaluate the control characteristics of the TPS51220A. The TPS51220A is
a dual peak current mode synchronous buck controller with three linear regulators. The EVM also allows the
engineer to configure several of the features of the TPS51220A controller.
2 Description
The TPS51220A EVM-476 provides two 8-A outputs: 3.3 V and 5 V. It accepts an input voltage from 8 V to 20 V.
Several jumpers and switches allow the user to evaluate various control functions of the TPS51220A. Switches
provide an easy method to enable and disable the EVM or each of the two outputs independently. Two jumper
blocks allow the user to select the mode of operation of each output. One jumper block allows the engineer to
select the control architecture and OVP function. One block allows for selection of overcurrent trip level and if the
output is discharged by the converter. See the following sections for more details.
2.1 Typical Applications
• Notebook computers and I/O bus
• Point-of-load in such applications as digital TV and multi-function printers
2.2 Features
• Input range from 8 V to 20 V
• Dual 8-A outputs: 3.3 V and 5 V
• Individual enable function for 3.3-V and 5-V output
• Selectable light load operation
• Selectable control architecture
• Inductor current sensing
• OVP disable function
• Output discharge disable function
• Test points for easy access to measure key parameters
3 Electrical Performance Specifications
Table 3-1. TPS51220A EVM-476 Electrical Performance Specifications
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNITS
Input Characteristics
Voltage range
8
12
20
V
Maximum input current
12 V
IN
, both outputs at 8 A
5.8
A
Output Characteristics
Output voltage, VOUT 1
5
V
Output load current, IOUT1
0
8
A
Output voltage regulation
Line regulation: input voltage = 8 V to 20 V
±0.5%
Load regulation: output current = 0 A to 8 A
±1%
Output voltage ripple
At IOUT1 = 8 A
50
mVpp
Output over current
12
A
Switching frequency
330
kHz
Peak efficiency
97.8%
Full load efficiency
96.9%
Output voltage, VOUT 2
3.3
V
Output load current, IOUT2
0
8
A
Output voltage regulation
Line regulation: input voltage = 8 V to 20 V
±0.5%
Load regulation: output current = 0 A to 8 A
±1%
Output voltage ripple
At IOUT = 8 A
50
mVpp
Output over current
12
A
Switching frequency
330
kHz
Introduction
SLUU381B – SEPTEMBER 2009 – REVISED FEBRUARY 2022
TPS51220A Buck Controller Evaluation Module User's Guide
3
Copyright © 2022 Texas Instruments Incorporated
