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1.2
Performance Specification Summary
1.3
Modifications
1.3.1
Output Voltage Set Point
R2
10 k
1.221 V
V
O
1.221 V
(1)
Introduction
TPS5420 package along with the gate drive circuitry. The low drain-to-source on resistance of the
MOSFET allows the TPS5420 to achieve high efficiencies and helps to keep the junction temperature low
at high output currents. The compensation components are provided internal to the integrated circuit (IC),
whereas an external divider allows for an adjustable output voltage. Additionally, the TPS5420 provides an
enable input. The absolute maximum input voltage is 36 V.
Table 1. Input Voltage and Output Current Summary
EVM
INPUT VOLTAGE RANGE
OUTPUT CURRENT RANGE
TPS5420EVM-175
VIN = 10 V to 36 V
0 A to 2 A
A summary of the TPS5420EVM-175 performance specifications is provided in
Table 2
. Specifications are
given for an input voltage of VIN = 12 V and an output voltage of 5 V, unless otherwise specified. The
TPS5420EVM-175 is designed and tested for VIN = 10 V to 36 V. The ambient temperature is 25
°
C for all
measurements, unless otherwise noted. Maximum input voltage for the TPS5420EVM-175 is 36 V.
Table 2. TPS5420EVM-175 Performance Specification Summary
SPECIFICATION
TEST CONDITIONS
MIN
TYP
MAX
UNIT
VIN voltage range
10
36
V
Output voltage set point
5.0
V
Output current range
V
IN
= 10 V to 36 V
0
2.5
A
Line regulation
I
O
= 1 A, VIN = 3 V - 6 V
±
0.11%
Load regulation
VIN = 25 V, I
O
= 0 A to 2.5 A
±
0.1%
Load transient response
Voltage change
I
O
= 0.75 A to 2.25 A
-40
mV
Recovery time
200
µ
s
Voltage change
I
O
= 2.25 A to 0.75 A
+40
mV
Recovery time
200
µ
s
Loop bandwidth
VIN = 25 V
25.0
kHz
Phase margin
VIN = 25 V
55
°
Input ripple voltage
I
O
= 3 A
275
300
mVpp
Output ripple voltage
32
mVpp
Output rise time
7
ms
Operating frequency
500
kHz
Maximum efficiency
VIN = 10 V, V
O
= 5 V, I
O
= 0.75 A
93.2%
The TPS5420EVM-175 is designed to demonstrate the small size that can be attained when designing
with the TPS5420. A few changes can be made to this module.
To change the output voltage of the EVM, it is necessary to change the value of resistor R2. Changing the
value of R2 can change the output voltage above 1.25 V. The value of R2 for a specific output voltage can
be calculated using
Equation 1
.
Table 3
lists the R2 values for some common output voltages. Note that VIN must be in a range so that
the minimum on-time is greater than 200 ns, and the maximum duty cycle is less than 87%. The values
given in
Table 3
are standard values, not the exact value calculated using
Equation 1
.
TPS5420EVM-175 SWIFT™ Regulator Evaluation Module
2
SLVU163 – April 2006
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