OPA357AIDBVR datasheet(21/39 Pages) TI2

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OPA357, OPA2357

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SBOS235F – MARCH 2002 – REVISED APRIL 2018

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Typical Applications (continued)

8.2.1.1 Design Requirements

For this design example, use the parameters listed in Table 2 as the input parameters.

Table 2. Design Parameters

PARAMETER

EXAMPLE VALUE

Supply voltage, V(V+)

2.5 V

Supply voltage, V(V-)

–2.5 V

C(F) is optional to prevent gain peaking. C(F) includes the stray capacitance of R(F).

8.2.1.2 Detailed Design Procedure

8.2.1.2.1

Custom Design With WEBENCH® Tools

Click here to create a custom design using the OPA357 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.

8.2.1.2.2

OPAx357 Design Procedure

To achieve a maximally-flat, second-order Butterworth frequency response, set the feedback pole using

Equation 3.

(3)

Calculate the bandwidth using Equation 4.

(4)

For other transimpedance bandwidths, consider the high-speed CMOS OPA380 (90-MHz GBW), OPA354

(100-MHz GBW), OPA300 (180-MHz GBW), OPA355 (200-MHz GBW), or OPA656 and OPA657 (400-MHz

GBW).

OPA357AIDBVR Datasheet(PDF) 21 Page - Texas Instruments

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