1 Introduction
This user's guide contains background information for the TPS54521, as well as support documentation for
the TPS54521EVM-607 evaluation module (HPA607). Also included are the performance specifications, the
schematic, and the bill of materials for the TPS54521EVM-607.
1.1 Background
The TPS54521 dc/dc converter is designed to provide up to a 5 A output. The TPS54521 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 TPS54521EVM-607
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
. This evaluation module demonstrates a
low cost design that may be achieved when designing with the TPS54521 regulator. The switching frequency
is externally set at a nominal 480 kHz. The high-side and low-side MOSFETs are incorporated inside the
TPS54521 package along with the gate drive circuitry. The compensation components are external to the
integrated circuit (IC), and an external divider allows for an adjustable output voltage. Additionally, the TPS54521
provides adjustable slow start, tracking and undervoltage lockout inputs. The absolute maximum input voltage is
20 V for the TPS54521EVM-607.
Table 1-1. Input Voltage and Output Current Summary
EVM
INPUT VOLTAGE RANGE
OUTPUT CURRENT RANGE
TPS54521EVM-607
VIN = 8 V to 17 V (VIN start voltage = 6.806 V)
0 A to 5 A
1.2 Performance Specification Summary
A summary of the TPS54521EVM-607 performance specifications is provided in
. Specifications
are given for an input voltage of 12 V and an output voltage of 3.3 V, unless otherwise specified. The
TPS54521EVM-607 is designed and tested for V
IN
= 8 V to 17 V with the VIN and PVIN pins connected together
with the JP1 jumper. The ambient temperature is 25°C for all measurements, unless otherwise noted.
Table 1-2. TPS54521EVM-607 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
5
A
Line regulation
I
O
= 5 A, V
IN
= 8 V to 17 V
±0.04%
Load regulation
V
IN
= 12 V, I
O
= 0 A to 5 A
±0.05%
Load transient response
I
O
= 2 A to 4 A
Voltage change
150
mV
Recovery time
6
μs
I
O
= 4 A to 2 A
Voltage change
125
mV
Recovery time
6
μs
Loop bandwidth
V
IN
= 12 V, I
O
= 5 A
42
kHz
Phase margin
V
IN
= 12 V , I
O
= 5 A
62
°
Input ripple voltage
V
IN
= 12 V, I
O
= 5 A
500
mV
PP
Output ripple voltage
V
IN
= 12 V, I
O
= 5 A
75
mV
PP
Output rise time
3.5
ms
Operating frequency
480
kHz
Maximum efficiency
TPS54521EVM-607, V
IN
= 8 V, I
O
= 1.1 A
94.5%
Introduction
SLVU379A – AUGUST 2010 – REVISED AUGUST 2021
TPS54521 Step-Down Converter Evaluation Module User's Guide
3
Copyright © 2021 Texas Instruments Incorporated
