Texas Instruments Evaluation Module for TPS54821 TPS54821EVM-049 TPS54821EVM-049 데이터 시트
제품 코드
TPS54821EVM-049
Introduction
1
Introduction
1.1
Background
The TPS54821 dc/dc converter is designed to provide up to a 8-A output. The TPS54821 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 whereas the control input (VIN) is rated for 4.5 V to 17
V. The TPS54821EVM-049 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
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 whereas the control input (VIN) is rated for 4.5 V to 17
V. The TPS54821EVM-049 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 is designed to demonstrate the small printed-circuit-board areas that may be achieved
when designing with the TPS54821 regulator. The switching frequency is externally set at a nominal
480 kHz. The high-side and low-side MOSFETs are incorporated inside the TPS54821 package along with
the gate drive circuitry. The low drain-to-source on-resistance of the MOSFET allows the TPS54821 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 TPS54821 provides adjustable slow start, tracking, and
undervoltage lockout inputs. The absolute maximum input voltage is 20 V for the TPS54821EVM-049.
when designing with the TPS54821 regulator. The switching frequency is externally set at a nominal
480 kHz. The high-side and low-side MOSFETs are incorporated inside the TPS54821 package along with
the gate drive circuitry. The low drain-to-source on-resistance of the MOSFET allows the TPS54821 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 TPS54821 provides adjustable slow start, tracking, and
undervoltage lockout inputs. The absolute maximum input voltage is 20 V for the TPS54821EVM-049.
Table 1. Input Voltage and Output Current Summary
OUTPUT CURRENT
EVM
INPUT VOLTAGE RANGE
RANGE
TPS54821EVM-049
VIN = 8 V to 17 V (VIN start voltage = 6.528 V)
0 A to 8 A
1.2
Performance Specification Summary
A summary of the TPS54821EVM-049 performance specifications is provided in
. Specifications
are given for an input voltage of V
IN
= 12 V and an output voltage of 3.3 V, unless otherwise specified. The
TPS54821EVM-049 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 2. TPS54821EVM-049 Performance Specification Summary
SPECIFICATION
TEST CONDITIONS
MIN
TYP
MAX
UNIT
V
IN
voltage range (PVIN = VIN)
8
12
17
V
V
IN
start voltage
6.528
V
V
IN
stop voltage
6.193
V
Output voltage setpoint
3.3
V
Output current range
V
IN
= 8 V to 17 V
0
8
A
Line regulation
I
O
= 4 A, V
IN
= 8 V to 17 V
±
0.005
%
Load regulation
V
IN
= 12 V, I
O
= 0 A to 8 A
±
0.07
%
Voltage change
–
130
mV
I
O
= 2 A to 6 A
Recovery time
80
µ
s
Load transient response
Voltage change
130
mV
I
O
= 6 A to 2 A
Recovery time
80
µ
s
Loop bandwidth
V
IN
= 12 V, I
O
= 8 A
60
kHz
Phase margin
V
IN
= 12 V , I
O
= 8 A
74
°
Input ripple voltage
I
O
= 8 A
900
mVPP
Output ripple voltage
I
O
= 8 A
10
mVPP
Output rise time
6
ms
Operating frequency
480
kHz
Maximum efficiency
TPS54821EVM-049, V
IN
= 8 V, I
O
= 1.5 A
95.9
%
2
TPS54821EVM-049, 8-A, SWIFT
™
Regulator
—
Evaluation Module
SLVU479
–
October 2011
Copyright
©
2011, Texas Instruments Incorporated