Texas Instruments TPS54231, Руководство пользователя

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1 Introduction
This user's guide contains background information for the TPS54231 as well as support documentation for
the TPS54231EVM-372 evaluation module (HPA372). Also included are the performance specifications, the
schematic, and the bill of materials for the TPS54231EVM-372.
1.1 Background
The TPS54231 dc/dc converter is designed to provide up to a 2 A output from an input voltage source of 3.5
V to 28 V. 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 TPS54231 regulator. The switching frequency is internally set at a nominal 570 kHz.
The high-side MOSFET is incorporated inside the TPS54231 package along with the gate drive circuitry. The
low drain-to-source on resistance of the MOSFET allows the TPS54231 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 TPS54231
provides adjustable slow start and undervoltage lockout inputs. The absolute maximum input voltage is 30 V for
the TPS54231EVM-372.
Table 1-1. Input Voltage and Output Current Summary
EVM INPUT VOLTAGE RANGE OUTPUT CURRENT RANGE
TPS54231EVM-372 VIN = 7 V to 28 V 0 A to 2 A
1.2 Performance Specification Summary
A summary of the TPS54231EVM-372 performance specifications is provided in Table 1-2 . Specifications are
given for an input voltage of V
IN
= 15 V and an output voltage of 3.3 V, unless otherwise specified. The
TPS54231EVM-372 is designed and tested for V
IN
= 7 V to 28 V. The ambient temperature is 25°C for all
measurements, unless otherwise noted.
Table 1-2. TPS54231EVM-372 Performance Specification Summary
SPECIFICATION TEST CONDITIONS MIN TYP MAX UNIT
V
IN
voltage range 7 15 28 V
Output voltage set point 3.3 V
Output current range V
IN
= 7 V to 28 V 0 2 A
Line regulation I
O
= 1 A, V
IN
= 7 V to 28 V ±0.15%
Load regulation V
IN
= 15 V, I
O
= 0 A to 2 A ±0.15%
Load transient response I
O
= 0.5 A to 1.5 A Voltage change –100 mV
Recovery time 150 μs
I
O
= 1.5 A to 0.5 A Voltage change 100 mV
Recovery time 150 μs
Loop bandwidth V
IN
= 15 V, I
O
= 1 A 27 kHz
Phase margin V
IN
= 15 V , I
O
= 1 A 55 °
Input ripple voltage I
O
= 2 A 125 mVpp
Output ripple voltage I
O
= 2 A 5 mVpp
Output rise time 6 ms
Operating frequency 570 kHz
Maximum efficiency TPS54231EVM-372, V
IN
= 7 V, I
O
= 0.5 A 92.7%
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2 TPS54231 Step-Down Converter Evaluation Module User's Guide SLVU263A – AUGUST 2008 – REVISED OCTOBER 2021
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