TPS65131 datasheet(13/44 Pages) TI

13 / 44 page

In typical applications, the recommendation is to choose a 4.7µH inductor. The device is optimized to work with

inductance values between 3.3µH and 6.8µH. Nevertheless, operation with higher inductance values may be

possible in some applications. Perform detailed stability analysis in this case. Be aware of the possibility that

load transients and losses in the circuit can lead to higher currents than estimated in Equation 3 and Equation 4.

Also, the losses caused by magnetic hysteresis and conductor resistance are a major parameter for total circuit

efficiency.

The following table shows inductors from different suppliers used with the TPS65131-Q1 converter:

Table 8-2. List of Inductors

VENDOR(1)

INDUCTOR SERIES

EPCOS

B8246284-G4

Wurth Elektronik

7447789XXX

744031XXX

TDK

VLF3010

VLF4012

Cooper Electronics Technologies SD12

(1)

See Section 9.3

8.2.3.2 Capacitor Selection

8.2.3.2.1 Input Capacitor

As a recommendation, choose an input capacitors of at least 4.7µF for the input of the boost converter (INP)

and accordingly for the input of the inverting converter (INN). This improves transient behavior of the regulators

and EMI behavior of the total power-supply circuit. Choose a ceramic capacitor or a tantalum capacitor. For the

use of a tantalum capcitor, an additonal, smaller ceramic capacitor (100nF) in parallel is required. Place the input

capacitor(s) close to the input pins.

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TPS65131-Q1

SLVSBB2F – MAY 2012 – REVISED AUGUST 2024

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