Datasheet
1
0.765 1
2
æ ö
= × +
ç ÷
è ø
OUT
R
V V
R
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Performance Specification Summary
2 Performance Specification Summary
A summary of the TPS54428 evaluation module performance specifications is provided in Table 2.
Specifications are given for an input voltage of V
IN
= 12 V and an output voltage of 1.05 V, unless
otherwise noted. The ambient temperature is 25°C for all measurement, unless otherwise noted.
Table 2. TPS54428EVM-052 Performance Specifications Summary
Specifications Test Conditions Min Typ Max Unit
Input voltage range (V
IN
) 4.5 12 18 V
Output voltage (V
OUT
) 1.05 V
Operating frequency V
IN
= 12 V, I
OUT
= 2 A 650 kHz
Output current range 0 4 A
Line regulation I
O
= 2.5 A +/- 0.33 %
Load regulation V
IN
= 12 V +0.9/- 0.1 %
Overcurrent limit V
IN
= 12 V, L = 1.5 µH 4.6 5.3 6.8 A
Output ripple voltage V
IN
= 12 V, I
OUT
= 4A 15 mV
PP
Maximum efficiency V
IN
= 5 V, I
OUT
= 0.7 A 88 %
3 Modifications
This evaluation module is designed to provide access to the features of the TPS54428. Some
modifications can be made to this module.
3.1 Output Voltage Setpoint
To change the output voltage of the EVM, it is necessary to change the value of resistor R1. Changing the
value of R1 can change the output voltage above 0.765 V. The value of R1 for a specific output voltage
can be calculated using Equation 1.
For output voltages from 0.76 V to 7 V:
(1)
Table 3 lists the R1 values for some common output voltages. For higher output voltages of 1.8 V or
above, a feedforward capacitor (C4) may be required to improve phase margin. Pads for this component
(C4) are provided on the printed-circuit board. Note that the resistor values given in Table 3 are standard
values and not the exact value calculated using Equation 1.
Table 3. Output Voltages
C9. C10, C11
Output Voltage R1 R2 C4 L1 Total
(V) (kΩ) (kΩ) (pF) (µH) Capacitance
(µF)
1 6.81 22.1 1.5 22 - 68
1.05 8.25 22.1 1.5 22 - 68
1.2 12.7 22.1 1.5 22 - 68
1.5 21.5 22.1 1.5 22 - 68
1.8 30.1 22.1 5 - 22 2.2 22 - 68
2.5 49.9 22.1 5 - 22 2.2 22 - 68
3.3 73.2 22.1 5 - 22 2.2 22 - 68
5 124 22.1 5 - 22 3.3 22 - 68
6.5 165 22.1 5 - 22 3.3 22 - 68
3
SLVU578–December 2011 TPS54428, 4-A, SWIFT™ Regulator Evaluation Module
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