TPS54061-Q1_16 Datasheet, PDF (16/39 Pages) Texas Instruments – Synchronous Step-Down DC–DC Converter

TPS54061-Q1
SLVSBM7A – MARCH 2013 – REVISED JANUARY 2016
8 Applications 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 TPS54061-Q1 is a 60-V, 200-mA step-down regulator with an integrated high-side and low-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 200 mA. Example applications are: Low-Power Standby or Bias Voltage Supplies or an efficient
replacement for high-voltage linear regulator. Use the following design procedure to select component values for
the TPS54061-Q1. This procedure shows the design of a high-frequency switching regulator. These calculations
can be done with the aid of the TPS54x40/x60 design calculator (SLVC431). 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.
8.2 Typical Applications
8.2.1 Continuous Conduction Mode Application
C _BOOT
0.01 μF
8 V to 60 V
C _IN
2.2 μF
R _UVLO1
196 kΩ
R _UVLO2
36.5 kΩ
U1
TPS54061
1
8
2
7
3
6
4
5
R_T
143 kΩ
LO
100 μH
1
2
R _COMP
C _POLE
33 pF
26.1 kΩ
C _COMP
4700 pF
3.3 V 200 mA
C_O
10 μF
R _LS
10 kΩ
R _HS
31.6 kΩ
* See Enable and Adjusting Undervoltage Lockout.
Figure 20. CCM Application Schematic
8.2.1.1 Design Requirements
This example details the design of a continuous conduction mode (CCM) switching regulator design using
ceramic output capacitors. If a low output current design is needed, see Discontinuous Conduction Mode
Application. A few parameters must be known in order to start the design process. These parameters are
typically determined at the system level. For this example, the following known parameters are listed in Table 1.
PARAMETER
Output voltage, V_OUT
Transient response 50 to 150-mA load step
Maximum output current
Input voltage, V_IN
Output voltage ripple
Table 1. Design Parameters
5.0 V
ΔV_OUT = 4%
200 mA
24 V nominal, 8 V to 60 V
0.5% of V_OUT
VALUE
16
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