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Introduction
3 SLVUAM8A – December 2015 – Revised March 2019
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TPS54A20EVM-770, 10-A, SWIFT™ regulator evaluation module
1.2 Background
The TPS54A20 dc/dc converter is a two-phase synchronous series capacitor buck converter designed to
provide up to a 10-A output. The input (VIN) is rated for 8 V to 14 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
TPS54A20 regulator. The switching frequency is externally set at a nominal 2 MHz for each side, 4 MHz
effective. The high-side and low-side MOSFETs are incorporated inside the TPS54A20 package along
with the gate drive circuitry. The low drain-to-source on-resistance of the MOSFET allows the TPS54A20
to achieve high efficiencies and helps keep the junction temperature low at high output currents. The
compensation components are internal to the integrated circuit (IC), and an external divider allows for an
adjustable output voltage. Additionally, the TPS54A20 provides adjustable slow start and undervoltage
lockout inputs. The absolute maximum input voltage is 15 V while switching and 17 V for non-switching
conditions.
Table 1. Input Voltage and Output Current Summary
EVM INPUT VOLTAGE RANGE
OUTPUT CURRENT
RANGE
TPS54A20EVM-770 VIN = 9.2 V to 14 V 0 A to 10 A
1.3 Performance Specification Summary
A summary of the TPS54A20EVM-770 performance specifications is provided in Table 2 . Specifications
are given for an input voltage of V
IN
= 12 V and an output voltage of 1.2 V, unless otherwise specified. The
TPS54A20EVM-770 is designed and tested for V
IN
= 9.2 V to 14 V. The ambient temperature is 25°C for
all measurements, unless otherwise noted.
Table 2. TPS54A20EVM-770 Performance Specification Summary
SPECIFICATION TEST CONDITIONS MIN TYP MAX UNIT
V
IN
voltage range 9.2 12 14 V
V
IN
start voltage 9.39 V
V
IN
stop voltage 9.14 V
Output voltage setpoint 1.2 V
Output current range V
IN
= 9.2 V to 14 V 0 10 A
Line regulation I
O
= 5 A, V
IN
= 9.2 V to 14 V ±0.04%
Load regulation V
IN
= 12 V, I
O
= 0 A to 10 A ±0.03%
Load transient response
I
O
= 0 A to 9 A
Voltage change –60 mV
Recovery time 60 µs
I
O
= 9 A to 0 A
Voltage change 60 mV
Recovery time 60 µs
Loop bandwidth V
IN
= 12 V, I
O
= 5 A 280 kHz
Phase margin V
IN
= 12 V , I
O
= 5 A 45 degree
Input ripple voltage I
O
= 10 A 90 mVPP
Output ripple voltage I
O
= 10 A 20 mVPP
Output rise time 512 µs
Operating frequency 2 MHz
Maximum efficiency TPS54A20EVM-770, V
IN
= 9 V, I
O
= 5 A 84.7%