TPS54561-Q1_15 Datasheet, PDF (28/51 Pages) Texas Instruments – TPS54561-Q1 4.5-V to 60-V Input, 5-A, Step-Down DC-DC Converter With Eco-mode™

TPS54561-Q1
SLVSC60 – SEPTEMBER 2014
8 Application and Implementation
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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 TPS54561-Q1 device is a 60-V, 5-A, step-down regulator with an integrated high-side MOSFET. This device
typically converts a higher dc voltage to a lower dc voltage with a maximum available output current of 5 A.
Example applications are: 12-V, 24-V and 48-V industrial, automotive and communication power systems. Use
the following design procedure to select component values for the TPS54561-Q1 device. This procedure
illustrates the design of a high-frequency switching regulator using ceramic output capacitors. The Excel™
spreadsheet (SLVC452) located on the product page can help on all calculations. Alternatively, use the
WEBENCH software to generate a complete design. The WEBENCH software uses an iterative 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 Application
V_I
GND
J2
GND
J4
2
1
TP1
TP2
GND
2
1
GND
EN
GND
J3
SS/TR
GND
J5
7 V to 60 V
C11
+
DNP
2
1
2 SS/TR
1
C10 C3
2.2µF 2.2µF
C1
2.2µF
C2
2.2µF
PWRGD
PWRGD PULLUP
R1
442k
R2
90.9k
R3
243k
R8
U1
TP10 1.00k ^TP9
2 _VDD
PWRGD ¹⁰ _C4
3 _EN
BOOT ¹
5 _RT/CLK
SW ⁹
0.1µF
SS/TR
4 _SS/TR
FB ⁶ FB
7 _COMP
GND ⁸
PAD
C13
R4
0.01µF 16.9k
TPS54561-Q1
C8
47pF
GND
C5
4700pF
L1
TP3
GND
TP5
7447798720
7.2µH
D1
PDS760-13
C6
C7
47µF 47µF
5 V @ 5A
1
TP6
TP7
2
R7
+ C12
49.9 _TP8 J1
C9 DNP
47µF
TP4
GND
R5
53.6k
GND
GND
FB
R6
10.2k
V_O
GND
GND
Figure 48. 5-V Output TPS54561-Q1 Design Example
8.2.1 Design Requirements
This guide illustrates the design of a high-frequency switching regulator using ceramic output capacitors. The
designer must know a few parameters in order to start the design process. Determination of these requirements
is typically at the system level. This example design uses the following known parameters:
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