Texas Instruments Evaluation Module for TPS54528 TPS54528EVM-052 TPS54528EVM-052 데이터 시트
제품 코드
TPS54528EVM-052
V
= 0.765 x
OUT
R1
1 +
R2
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TPS54528DDA
SLVSAY4C – JULY 2011 – REVISED MARCH 2014
9 Applications and Implementation
9.1 Application Information
The TPS54528 is designed to provide up to a 2-A output current from an input voltage source ranging from 4.5 V
to 18 V. The output voltage is configurable from 0.76 V to 6 V. A simplified design procedure for a 1.05-V output
is shown below .
to 18 V. The output voltage is configurable from 0.76 V to 6 V. A simplified design procedure for a 1.05-V output
is shown below .
9.2 Typical Application
Figure 12. 5-A Synchronous Step-Down (Buck) Converter
9.2.1 Design Requirements
shows the schematic of the design example.
To begin the design process, the user must know a few application parameters:
•
•
Input voltage range
•
Output voltage
•
Output current
•
Output voltage ripple
•
Input voltage ripple
9.2.2 Detailed Design Procedure
9.2.2.1 Output Voltage Resistors Selection
The output voltage is set with a resistor divider from the output node to the VFB terminal. It is recommended to
use 1% tolerance or better divider resistors. Start by using
use 1% tolerance or better divider resistors. Start by using
to calculate V
OUT
.
To improve efficiency at light loads consider using larger value resistors, high resistance is more susceptible to
noise, and the voltage errors from the VFB input current are more noticeable.
noise, and the voltage errors from the VFB input current are more noticeable.
(3)
12
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