DFE252012PD-2R2M datasheet(21/54 Pages) TI

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9.2.1 Design Requirements

The design guidelines provide a component selection to operate the device within the recommended operating

conditions.

9.2.2 Detailed Design Procedure

9.2.2.1 Custom Design With WEBENCH® Tools

Click here to create a custom design using the TPS629211-Q1 device with the WEBENCH® Power Designer.

1. Start by entering the input voltage (VIN), output voltage (VOUT), and output current (IOUT) requirements.

2. Optimize the design for key parameters such as efficiency, footprint, and cost using the optimizer dial.

3. Compare the generated design with other possible solutions from Texas Instruments.

The WEBENCH Power Designer provides a customized schematic along with a list of materials with real-time

pricing and component availability.

In most cases, these actions are available:

• Run electrical simulations to see important waveforms and circuit performance

• Run thermal simulations to understand board thermal performance

• Export customized schematic and layout into popular CAD formats

• Print PDF reports for the design, and share the design with colleagues

Get more information about WEBENCH tools at www.ti.com/WEBENCH.

9.2.2.2 Programming the Output Voltage

The output voltage of the TPS629211-Q1 is adjustable and can be programmed for output voltages from 0.6 V to

5.5 V, using a resistor divider from VOUT to GND. The voltage at the FB pin is regulated to 600 mV. The value

of the output voltage is set by the selection of the resistor divider from Table 9-2. TI recommends to size R2 to

be less than 300 kΩ to allow for a feedback current of at least 2 μA. Lower resistor values are recommended for

highest accuracy and most robust design.

R1=R2× VOUTVFB−1

(12)

where

• VFB is 0.6 V.

Table 9-2. Setting the Output Voltage

Nominal Output Voltage

Exact Output Voltage

0.8 V

51 kΩ

150 kΩ

0.804 V

1.2 V

130 kΩ

1.200 V

1.5 V

150 kΩ

100 kΩ

1.500 V

1.8 V

475 kΩ

237 kΩ

1.803 V

2.5 V

523 kΩ

165 kΩ

2.502 V

3.3 V

619 kΩ

137 kΩ

3.311 V

5 V

619 kΩ

84.5 kΩ

4.995 V

9.2.2.3 External Component Selection

The external components have to fulfill the needs of the application, but also the stability criteria of the control

loop of the device. The TPS629211-Q1 is optimized to work within a range of external components.

9.2.2.3.1 Output Filter and Loop Stability

The TPS629211-Q1 is internally compensated to be stable with a range of LC filter combinations. The LC output

filters inductance and capacitance have to be considered together, creating a double pole, responsible for the

corner frequency of the converter using Equation 13.

www.ti.com

TPS629211-Q1

SLVSGD0A – MARCH 2022 – REVISED MARCH 2023

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