TPS5430_15 Datasheet, PDF (21/36 Pages) Texas Instruments – TPS543x 3-A, Wide Input Range, Step-Down Converter

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TPS5430, TPS5431
SLVS632G – JANUARY 2006 – REVISED FEBRUARY 2015
8.2.2 Wide Input Voltage Ranges with TPS5430
Figure 17 shows an application circuit using the wide input voltage range of the TPS5430.
10-35 V
VIN
C1
4.7 mF
ENA
C4
4.7 mF
U1
TPS5430DDA
VIN _BOOT
ENA
NC
PH
NC
GND
VSNS
PwPd
C2
0.01 mF
L1
22 mH
D1
B340A
+ C3
220 mF
5V
VOUT
R1
10 kW
C3 = Sanyo POSCAP 10TP220M
R2
3.24 kW
Figure 17. 10 V– 35 V Input to 5 V Output Application Circuit
8.2.2.1 Design Requirements
For this design example, use the following as the input parameters. This circuit is also designed with a larger
value output inductor and a lower closed loop crossover frequency.
DESIGN PARAMETER
Input voltage range
Output voltage
Input ripple voltage
Output ripple voltage
Output current rating
Operating frequency
EXAMPLE VALUE
10 V to 35 V
5V
300 mV
30 mV
3A
500 kHz
8.2.2.2 Detailed Design Procedure
The design procedure is similar to what is given for the design example in Detailed Design Procedure.
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