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OUT

9

TLV62585

www.ti.com

SLVSDE5A – JULY 2017 – REVISED AUGUST 2017

Product Folder Links: TLV62585

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Copyright © 2017, Texas Instruments Incorporated

8.2.2 Detailed Design Procedure

8.2.2.1 Custom Design With WEBENCH® Tools

Click here to create a custom design using the TLV62585 device with the WEBENCH® Power Designer.

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.

8.2.2.2 Setting The Output Voltage

The output voltage is set by an external resistor divider according to Equation 2:

(2)

R2 must not be higher than 100 kΩ to achieve high efficiency at light load while providing acceptable noise

sensitivity.

8.2.2.3 Output Filter Design

The inductor and the output capacitor together provide a low-pass filter. To simplify the selection process,

Table 4 outlines possible inductor and capacitor value combinations for most applications.

(1)

Inductor tolerance and current derating is anticipated. The effective inductance can vary by 20% and

–30%.

(2)

For low output voltage applications (< 1.8 V), more output capacitance is recommended (usually

≥ 22

μF) for smaller ripple. For output capacitance higher than 47 µF, a feed forward capacitor is needed.

(3)

Capacitance tolerance and bias voltage derating is anticipated. The effective capacitance can vary by

20% and –50%.

(4)

Typical application configuration. Other '+' mark indicates recommended filter combinations.

Table 4. Matrix of Output Capacitor and Inductor Combinations

(2) (3)

10

22

47

100

0.47

1

+

+

2.2