O
INTREF
FB
HS
FB
LS
INTREF
V
V
R
R
V
_
_
u
Introduction
3
SLVUBO0A – March 2020 – Revised May 2020
Copyright © 2020, Texas Instruments Incorporated
Using the TPS54JA20EVM-023 12-A, Buck Converter Evaluation Module
1.2
Performance Specification Summary
A summary of the TPS54JA20EVM performance specifications is provided in
. Specifications are
given for an input voltage of V
IN
= 12 V and an output voltage of 2.5 V, unless otherwise specified. The
TPS54JA20EVM is designed and tested for V
IN
= 4 V to 16 V. The ambient temperature is 25°C for all
measurements, unless otherwise noted.
Table 2. TPS54JA20EVM Performance Specification Summary
SPECIFICATION
TEST CONDITIONS
MIN
TYP
MAX
Unit
V
IN
voltage range (without internal
Bias)
4
12
16
V
V
IN
voltage range (with external Bias)
2.7
12
16
V
Output voltage setpoint
2.5
V
Output current range
V
IN
= 4 V to 16 V
0
12
12
A
Internal LDO Voltage
3.0
V
Line regulation
V
IN
= 4 V to 16 V, I
O
= 12 A
+/– 0.07%
Load regulation
V
IN
= 12 V, I
O
= 0 A to 12 A
+/– 0.12%
Load transient response
I
O
= 3 A to 9 A , 2
A/us
Voltage change
–50
mV
Recovery time
12
µs
I
O
= 9 A to 3 A , 2
A/us
Voltage change
50
mV
Recovery time
12
µs
Loop bandwidth
V
IN
= 12 V, I
O
= 12 A
75
kHz
Phase margin
V
IN
= 12 V , I
O
= 12 A
58
degree
Output ripple voltage
I
O
= 12 A
12
15
mVPP
Operating frequency
600
800
1000
kHz
1.3
Modifications
These evaluation modules are designed to provide access to the features of the TPS54JA20. Some
modifications can be made to this module.
1.3.1
Output Voltage Setpoint
To change the output voltage of the EVM, it is necessary to change the value of resistor R6 and R7. R9 is
fixed at 10k Ohm. Changing the total value of R6 plus R7 can change the output voltage above the 0.9V
reference voltage V
INTREF
. A two resistor configuration of R6+R7 is implemented to give the exact desired
output voltage setting. The value of R6 and R7 for a specific output voltage can be calculated using
.
(1)
V
INTREF
= 0.9V
R
FB_HS
= R
6
+ R
7
R
FB_LS
= R
9
= 10k
Ω
