TPS54361_16 Datasheet, PDF (28/51 Pages) Texas Instruments – 4.5-V to 60-V Input, 3.5-A, Step-Down DC-DC Converter

TPS54361
SLVSC39C – NOVEMBER 2013 – REVISED FEBRUARY 2016
8 Application and Implementation
www.ti.com
NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
8.1 Application Information
The TPS54361 device is a 60-V, 3.5-A, step-down regulator with an integrated high-side MOSFET. This device is
typically used to convert a higher DC voltage to a lower DC voltage with a maximum available output current of
3.5 A. Example applications are: 12 V, 24 V, and 48 V industrial, automotive, and communications power
systems. Use the following design procedure to select component values for the TPS54361 device. This
procedure illustrates the design of a high-frequency switching regulator using ceramic output capacitors.
Calculations can be done with the excel spreadsheet (SLVC452) located on the product page. Alternately, use
the WEBENCH® software to generate a complete design. The WEBENCH software uses an interactive design
procedure and accesses a comprehensive database of components when generating a design. This section
presents a simplified discussion of the design process.
8.2 Typical Applications
8.2.1 Buck Converter With 7-V to 60-V Input and 5-V at 3.5-A Output
VIN
2
GND
1
J2
7 V to 60 V
TP1
C11
+
DNP
DNPC10 DNPC3
2.2µF 2.2µF
C1
2.2µF
C2
2.2µF
R1
442k
2
GND
1
J4
TP2
GND
GND
EN
GND
2
1
J3
R2
90.9k
SS/TR
GND
J5
2 SS/TR
1
GND
R3
162k
SS/TR
C13
R4
0.01µF 13.0k
C5
6800pF
PWRGD
PWRGD PULL UP
U1
2 _VIN
PWRGD
3 _EN
BOOT
5 _RT/CLK
SW
4 _SS/TR
FB
7 _COMP
GND
PAD
TPS54361DPR
C8
39pF
R8
TP10 1.00k
10
C4
1
9
0.1µF
6 _FB
8
GND
TP9
TP5
L1
7447797820
8.2µH
D1
PDS560-13
TP3
GND
C6
47µF
5 V @ 3.5A
TP6
+ C12
C7 DNPC9 DNP
47µF 47µF
1
R7
49.9
TP4
R5
53.6k
1
TP7
2
TP8 ^J1
GND
GND
FB
R6
10.2k
GND
Figure 46. 5-V Output TPS54361 Design Example
VOUT
GND
8.2.1.1 Design Requirements
A few parameters must be known in order to start the design process. These requirements are typically
determined at the system level. This example is designed to the known parameters in Table 1:
Table 1. Design Parameters
DESIGN PARAMETER
Output Voltage
Transient Response 0.875-A to 2.625-A Load Step
Maximum Output Current
Input Voltage
Output Voltage Ripple
Start Input Voltage (rising VIN)
Stop Input Voltage (falling VIN)
EXAMPLE VALUE
5V
ΔV_OUT = ±4 %
3.5 A
12 V nominal 7 V to 60 V
0.5% of V_OUT
6.5 V
5V
28
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