Texas Instruments TPS54335AEVM-010 User Manual
User's Guide
SLVUB76–July 2017
TPS54335AEVM-010 3-A Regulator Evaluation Module
This user's guide contains background information for the TPS54335A as well as support documentation
for the TPS54335AEVM-010 evaluation module (BSR010-001). Also included are the performance
specifications, the schematic, and the bill of materials for the TPS54335AEVM-010.
Contents
1 Introduction ................................................................................................................... 2
2 Test Setup and Results ..................................................................................................... 4
3 Board Layout................................................................................................................ 12
4 Schematic and Bill of Materials........................................................................................... 14
List of Figures
1 TPS54335AEVM-010 Efficiency ........................................................................................... 5
2 TPS54335AEVM-010 Low Current Efficiency ........................................................................... 5
3 TPS54335AEVM-010 Load Regulation................................................................................... 6
4 TPS54335AEVM-010 Line Regulation.................................................................................... 6
5 TPS54335AEVM-010 Transient Response .............................................................................. 7
6 TPS54335AEVM-010 Loop Response ................................................................................... 7
7 TPS54335AEVM-010 Output Ripple, I
8 TPS54335AEVM-010 Output Ripple, I
9 TPS54335AEVM-010 Output Ripple, I
10 TPS54335AEVM-010 Input Ripple ....................................................................................... 9
11 TPS54335AEVM-010 Start-Up Relative to V
12 TPS54335AEVM-010 Start-up Relative to Enable .................................................................... 10
13 TPS54335AEVM-010 Shut-down Relative to V
14 TPS54335AEVM-010 Shut-down Relative to EN ...................................................................... 11
15 TPS54335AEVM-010 Top-Side Assembly.............................................................................. 12
16 TPS54335AEVM-010 Top-Side Layout ................................................................................. 13
17 TPS54335AEVM-010 Bottom-Side Layout ............................................................................. 13
18 TPS54335AEVM-010 Schematic......................................................................................... 14
= 3 A ........................................................................ 8
OUT
= 100 mA.................................................................... 8
OUT
= 0 A ......................................................................... 9
OUT
......................................................................... 10
IN
...................................................................... 11
IN
1 Input Voltage and Output Current Summary............................................................................. 2
2 TPS54335AEVM-010 Performance Specification Summary........................................................... 2
3 Output Voltages Available.................................................................................................. 3
4 EVM Connectors and Test Points ......................................................................................... 4
5 TPS54335AEVM-010 Bill of Materials................................................................................... 15
Trademarks
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List of Tables
TPS54335AEVM-010 3-A Regulator Evaluation Module
Copyright © 2017, Texas Instruments Incorporated
1
Introduction
1 Introduction
This user's guide contains background information for the TPS54335A as well as support documentation
for the TPS54335AEVM-010 evaluation module (BSR010-001). Also included are the performance
specifications, the schematic, and the bill of materials for the TPS54335AEVM-010.
1.1 Background
The TPS54335A dc/dc converter is designed to provide up to a 3-A output from an input voltage source of
4.5 V to 28 V. Rated input voltage and output current range for the evaluation module are given in
Table 1. This evaluation module is designed to demonstrate the small printed-circuit-board areas that may
be achieved when designing with the TPS54335A regulator. The switching frequency is externally set at a
nominal 340 kHz. The high-side and low-side MOSFETs are incorporated inside the TPS54335A package
along with the gate-drive circuitry. The low drain-to-source on resistance of the MOSFETs allow the
TPS54335A to achieve high efficiencies and helps keep the junction temperature low at high output
currents. The compensation components are external to the integrated circuit (IC), and an external divider
allows for an adjustable output voltage. Additionally, the TPS54335A provides an adjustable undervoltage
lockout input. The absolute maximum input voltage is 30 V for the TPS54335AEVM-010.
Table 1. Input Voltage and Output Current Summary
EVM INPUT VOLTAGE RANGE OUTPUT CURRENT RANGE
TPS54335AEVM-010 VIN = 8 V to 28 V 0 A to 3 A
1.2 Performance Specification Summary
A summary of the TPS54335AEVM-010 performance specifications is provided in Table 2. Specifications
are given for an input voltage of VIN= 24 V and an output voltage of 5.0 V, unless otherwise specified. The
TPS54335AEVM-010 is designed and tested for VIN= 8 V to 28 V. The ambient temperature is 25°C for all
measurements, unless otherwise noted.
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Table 2. TPS54335AEVM-010 Performance Specification Summary
SPECIFICATION TEST CONDITIONS MIN TYP MAX UNIT
VINoperating voltage range 8 24 28 V
VINstart voltage 7.12 V
VINstop voltage 6.12 V
Output voltage set point 5 V
Output current range VIN= 8 V to 28 V 0 3 A
Line regulation IO= 1.5 A, VIN= 8 V to 28 V ±0.05%
Load regulation VIN= 24 V, IO= 0 A to 3 A ±0.15%
IO= 0.75 A to 2.25 A
Load transient response
IO= 2.25 A to 0.75 A
Loop bandwidth VIN= 24 V, IO= 1.5 A 31.6 kHz
Phase margin VIN= 24 V , IO= 1.5 A 61 °
Input ripple voltage IO= 3 A 400 mV
Output ripple voltage IO= 3 A <30 mV
Output rise time 2 ms
Operating frequency 340 kHz
Maximum efficiency TPS54335AEVM-010, VIN= 8 V, IO= 0.7 A 96.5%
Voltage change –190 mV
Recovery time 150 μs
Voltage change 190 mV
Recovery time 150 μs
PP
PP
2
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( )
´
- + +
ENFALLING
STOP ENFALLING p h
R1 V
R2 =
V V R1 I I
æ ö
-
ç ÷
è ø
æ ö
- +
ç ÷
è ø
ENFALLING
START STOP
ENRISING
ENFALLING
p h
ENRISING
V
V V
V
R1 =
V
I 1 I
V
OUT
R7 0.8 V
V -0.8V
´
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1.3 Modifications
These evaluation modules are designed to provide access to the features of the TPS54335A. Some
modifications can be made to this module.
1.3.1 Output Voltage Set Point
The voltage divider, R7 and R8, is used to set the output voltage. To change the output voltage of the
EVM, it is necessary to change the value of resistor R8. Changing the value of R8 can change the output
voltage above 0.8 V. The value of R8 for a specific output voltage can be calculated using Equation 1.
Use 100 kΩ for R7.
Table 3 lists the R9 and R10 values for some common output voltages. Note that VINmust be in a range
so that the minimum on-time is greater than 145 ns, and the maximum duty cycle is less than 100%. The
values given in Table 3 are standard values, not the exact value calculated using Equation 1.
Output Voltage (V) R7 Value (kΩ) R8 Value (kΩ)
Introduction
(1)
Table 3. Output Voltages Available
1.2 100 200
1.8 100 80.6
2.5 100 47.5
3.3 100 32.4
5.0 100 19.1
1.3.2 Adjustable UVLO
The under voltage lock out (UVLO) can be adjusted externally using R1 and R2. The EVM is set for a start
voltage of 7.12 V and a stop voltage of 6.12 V using R1 = 220 kΩ and R2 = 43.2 kΩ. Use Equation 2 and
Equation 3 to calculate required resistor values for different start and stop voltages.
Ip= 1.15 µA, Ih= 3.3 µA, V
ENFALLING
= 1.17 V and V
ENRISING
(2)
(3)
= 1.21 V
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TPS54335AEVM-010 3-A Regulator Evaluation Module
Copyright © 2017, Texas Instruments Incorporated
3
Test Setup and Results
2 Test Setup and Results
This section describes how to properly connect, set up, and use the TPS54335AEVM-010 evaluation
module. The section also includes test results typical for the evaluation module and covers efficiency,
output voltage regulation, load transients, loop response, output ripple, input ripple, and start-up.
2.1 Input/Output Connections
The TPS54335AEVM-010 is provided with input/output connectors and test points as shown in Table 4. A
power supply capable of supplying 2 A must be connected to J1 through a pair of 20-AWG wires. The load
must be connected to J4 through a pair of 20-AWG wires. The maximum load current capability must be
at least 4 A to use the full capability of this EVM. Wire lengths must be minimized to reduce losses in the
wires. Test-point TP1 provides a place to monitor the VINinput voltages with TP2 providing a convenient
ground reference. TP6 is used to monitor the output voltage with TP7 as the ground reference.
Reference Designator Function
J1 VIN(see Table 1 for VINrange).
J2 V
JP1 2-pin header for enable. Connect EN to ground to disable, open to enable.
TP1 VINtest point at VINconnector.
TP2 GND test point at VIN.
TP3 Slow start monitor test point for TPS54336A. Do not use for TPS54335A.
TP4 PH test point
TP5 Test point between voltage divider network and output. Used for loop response measurements.
TP6 Output voltage test point at OUT connector.
TP7 GND test point at OUT connector.
, 5 V at 3 A maximum.
OUT
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Table 4. EVM Connectors and Test Points
4
TPS54335AEVM-010 3-A Regulator Evaluation Module
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0
10
20
30
40
50
60
70
80
90
100
0.001 0.01 0.1 1 10
Efficiency - %
Output Current - A
C002
VIN = 12 V
VIN = 24 V
0
10
20
30
40
50
60
70
80
90
100
0.0 0.5 1.0 1.5 2.0 2.5 3.0
Efficiency - %
Output Current - A
C001
VIN = 24 V
VIN = 12 V
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2.2 Efficiency
The efficiency of this EVM peaks at a load current of about 0.5 A – 1 A, and then decreases as the load
current increases towards full load. Figure 1 shows the efficiency for the TPS54335AEVM-010 at an
ambient temperature of 25°C.
Test Setup and Results
Figure 1. TPS54335AEVM-010 Efficiency
Figure 2 shows the efficiency for the TPS54335AEVM-010 on a semi-log scale to better show light load
efficiency. The ambient temperature is 25°C.
The efficiency may be lower at higher ambient temperatures, due to temperature variation in the drain-tosource resistance of the internal MOSFET.
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Figure 2. TPS54335AEVM-010 Low Current Efficiency
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TPS54335AEVM-010 3-A Regulator Evaluation Module
5
-0.5
-0.4
-0.3
-0.2
-0.1
0
0.1
0.2
0.3
0.4
0.5
5 10 15 20 25 30
Line Rgulation - %
Input Voltage - V
C004
I
OUT
= 1.5 A
±0.20
±0.15
±0.10
±0.05
0.00
0.05
0.10
0.15
0.20
0.0 0.5 1.0 1.5 2.0 2.5 3.0
Load Regulation - %
Output Current - A
C003
VIN = 24 V
VIN = 12 V
Test Setup and Results
2.3 Output Voltage Load Regulation
Figure 3 shows the load regulation for the TPS54335AEVM-010.
Figure 3. TPS54335AEVM-010 Load Regulation
Measurements are given for an ambient temperature of 25°C.
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2.4 Output Voltage Line Regulation
Figure 4 shows the line regulation for the TPS54335AEVM-010.
6
TPS54335AEVM-010 3-A Regulator Evaluation Module
Figure 4. TPS54335AEVM-010 Line Regulation
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