Texas Instruments Evaluation Module for TPS54528 TPS54528EVM-052 TPS54528EVM-052 Datenbogen
Produktcode
TPS54528EVM-052
V = 50 mV / div (-950 mV dc offset)
O
SW = 10 V / div
Time = 1 µsec / div
Vo (10 mV/div)
SW (5 V/div)
t - Time - 400 ns/div
t - Time - 100
s/div
m
Vout (50 mV/div)
Iout (2 A/div)
Vout (0.5 V/div)
EN (10 V/div)
VREG5 (5 V/div)
t - Time - 1 ms/div
SLVSAY4C – JULY 2011 – REVISED MARCH 2014
For this design two TDK C3216X5R0J226M 22µF output capacitors are used. The typical ESR is 2 m
Ω each.
The calculated RMS current is 0.29 A and each output capacitor is rated for 4A.
9.2.2.3 Input Capacitor Selection
The TPS54528 requires an input decoupling capacitor and a bulk capacitor is needed depending on the
application. A ceramic capacitor over 10
application. A ceramic capacitor over 10
μF is recommended for the decoupling capacitor. An additional 0.1 µF
capacitor (C3) from terminal 8 to ground is optional to provide additional high frequency filtering. The capacitor
voltage rating needs to be greater than the maximum input voltage.
voltage rating needs to be greater than the maximum input voltage.
9.2.2.4 Bootstrap Capacitor Selection
A 0.1 µF. ceramic capacitor must be connected between the VBST to SW terminal for proper operation. It is
recommended to use a ceramic capacitor.
recommended to use a ceramic capacitor.
9.2.2.5 Vreg5 Capacitor Selection
A 1-µF. ceramic capacitor must be connected between the VREG5 to GND terminal for proper operation. It is
recommended to use a ceramic capacitor.
recommended to use a ceramic capacitor.
9.2.3 Application Performance Curves
V
O
= 1.05 V
I
O
= 5 A
Figure 14. Start-Up Wave Form
Figure 13. Load Transient Response
V
O
= 1.05 V
I
O
= 2 A
I
O
= 30 mA
Figure 15. Voltage Ripple At Output
Figure 16. DCM Voltage Ripple At Output
14
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