SLMA002 datasheet(25/46 Pages) TI1

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Time

Output1

Output2

PVDD1

PVDD2

Multiphase Operation

TPS55383

,, TPS55386

www.ti.com ......................................................................................................................................................................................... SLUS818 – SEPTEMBER 2008

Figure 28. Waveforms Resulting from Cascading PVDD1 from Output 2

In this configuration, the following conditions must be maintained:

1. Output 2 must be of a voltage high enough to maintain regulation of Output 1 under all load conditions.

2. The sum of the current drawn by Output 2 load plus the current into PVDD1 must be less than the overload

protection current level of Output 2.

3. The method of output sequencing must be such that the voltage on Output 2 is sufficient to support Output 1

before Output 1 is enabled. This requrement may be accomplished by:

a delay of the enable function

selecting sequential sequencing of Output 1 starting after Output 2 is in regulation

The TPS5538x may be configured to operate as a two-channel multiphase converter capable of delivering up to

6 A. Figure 29 indicates the recommended pin connections. In this configuration, FB2 must be tied to BP for the

maximum current configuration and the two output filter inductors must be the same value. Calculate RCOMP and

CCOMP as outlined for a single channel output, then use one-half the RCOMP value and two times the CCOMP value

as the compensation components. Contact the factory for further support.

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Product Folder Link(s): TPS55383 TPS55386

SLMA002 Datasheet(PDF) 25 Page - Texas Instruments

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