L6460 datasheet(42/139 Pages) STMICROELECTRONICS

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Start-up configurations

L6460

42/139

Doc ID 17713 Rev 1

8.6.2

Primary regulator mode (KP)

In this configuration bridge 4 can be configured by firmware while bridge 3 is configured as

two separate synchronous switching regulators. The last regulator in the sequence

(VAUX2_SW) is not considered a system regulator.

When in this mode the power-up sequence is:

Auxiliary switching regulator1 (VAUX1_SW).

Main switching regulator (VSWmain) together with main linear regulator (VLINmain).

Auxiliary switching regulator2 (VAUX2_SW) (Not system regulator).

8.6.3

Regulators mode

In this configuration bridge 4 can be configured by firmware while bridge 3 is configured as

two separate synchronous switching regulators, but the start up sequence is different

previous one.

When in this mode the power-up sequence is:

Main switching regulator (VSWmain).

Auxiliary switching regulator1 (VAUX1_SW)

Auxiliary switching regulator2 (VAUX2_SW)

8.6.4

Simple regulator mode (KT)

Also in this configuration bridge 4 can be configured by firmware while bridge 3 is configured

as two separate synchronous switching regulators. The last regulator in the sequence

(VSWmain) is not considered a system regulator.

When in this mode the power-up sequence is:

Auxiliary switching regulator1 (VAUX1_SW).

Auxiliary switching regulator2 (VAUX2_SW)

Main linear regulator (VLINmain)

Main switching regulator (VSWmain) (not system regulator).

8.6.5

Bridge + VEXT mode

In this configuration bridges 3 and 4 are not used as regulators and the regulator obtained

using the switching regulator controller (VSWDRV) is included in start-up.

When in this mode the power-up sequence is:

Main switching regulator (VSWmain).

Switching regulator controller regulator (VSWDRV).

Main linear regulator (VLINmain).

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