Texas Instruments TPS54320, Руководство пользователя

Страница: 2 / 21

1 Introduction
This user's guide contains background information for the TPS54320 as well as support documentation for the
TPS54320 evaluation module (HPA513). Also included are the performance specifications, the schematic, and
the bill of materials for the TPS54320.
1.1 Background
The TPS54320 dc/dc converter is designed to provide up to a 3 A output. The TPS54320 implements split
input power rails with separate input voltage inputs for the power stage and control circuitry. The power stage
input (PVIN) is rated for 1.6 V to 17 V while the control input (VIN) is rated for 4.5 to 17 V. The TPS54320
provides both inputs but is designed and tested using the PVIN connected to VIN. Rated input voltage and
output current range for the evaluation module are given in
Table 1-1 . This evaluation module is designed to
demonstrate the small printed-circuit-board areas that may be achieved when designing with the TPS54320
regulator. The switching frequency is externally set at a nominal 480 kHz. The high-side and low-side MOSFETs
are incorporated inside the TPS54320 package along with the gate drive circuitry. The low drain-to-source on
resistance of the MOSFETs allows the TPS54320 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 TPS54320 provides
adjustable slow start, tracking and undervoltage lockout inputs. The absolute maximum input voltage is 20 V for
the TPS54320.
Table 1-1. Input Voltage and Output Current Summary
EVM Input Voltage Range Output Current Range
TPS54320 VIN = 8 V to 17 V (VIN start voltage = 6.806 V) 0 A to 3 A
1.2 Performance Specification Summary
A summary of the TPS54320 performance specifications is provided in Table 1-2 . Specifications are given for
an input voltage of 12 V and an output voltage of 3.3 V, unless otherwise specified. The TPS54320 is designed
and tested for V
IN
= 8 V to 17 V with the VIN and PVIN pins connect together with the JP1 jumper. The ambient
temperature is 25°C for all measurements, unless otherwise noted.
Table 1-2. TPS54320 Performance Specification Summary
SPECIFICATION TEST CONDITIONS MIN TYP MAX UNIT
V
IN
voltage range (PVIN = VIN) 8 12 17 V
V
IN
start voltage 6.806 V
V
IN
stop voltage 4.824 V
Output voltage set point 3.3 V
Output current range V
IN
= 8 V to 17 V 0 3 A
Line regulation I
O
= 3 A, V
IN
= 8 V to 17 V ± 0.02 %
Load regulation V
IN
= 12 V, I
O
= 0 A to 3 A ± 0.02 %
Load transient response
I
O
= 0.75 A to 1.5 A
Voltage change 90 mV
Recovery time 70 μs
I
O
= 1.5 A to 0.75 A
Voltage change 80 mV
Recovery time 70 μs
Loop bandwidth V
IN
= 12 V, I
O
= 3 A 32.1 kHz
Phase margin V
IN
= 12 V , I
O
= 3 A 82 °
Input ripple voltage I
O
= 3 A 480 mV
PP
Output ripple voltage I
O
= 3 A 10 mV
PP
Output rise time 3.5 ms
Operating frequency 480 kHz
Maximum efficiency TPS54320EVM-513, V
IN
= 8 V, I
O
= 0.9 A 94.9 %
Introduction www.ti.com
2 TPS54320 Step-Down Converter Evaluation Module User's Guide SLVU380A – SEPTEMBER 2010 – REVISED OCTOBER 2021
Submit Document Feedback
Copyright © 2021 Texas Instruments Incorporated