BTS6480SF datasheet(51/73 Pages) INFINEON

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SPOC - BTS6480SF

Diagnosis

Data Sheet

Rev. 1.0, 2010-04-12

Figure 24

Automatic Current Sense Multiplexer Switching

9.6

Switch Bypass Diagnosis

To detect short circuit to

BB, there is a switch bypass monitor implemented for all internal channels. In case of

short circuit between the output pin OUT and

BB in ON-state, the current will flow through the power transistor as

well as through the short circuit (bypass) with undefined ratio. As a result, the current sense signal will show lower

values than expected by the load current. In OFF-state, the output voltage will stay close to

BB potential which

means a small

DS.

The switch bypass monitor compares the voltage

DS across the power transistor of that channel, which is selected

by the current sense multiplexer (DCR.MUX) with threshold

DS(SB). The result of comparison can be read in SPI

AutoMUX_EXT .emf

PCLK

PCR.PST

DCR.AMUX

Ch. phase shift2

OUT5

Ch. phase shift5

Synch. high B *

Ch5

n* 1024

Set to0automatically

...

OUT0

OUT2

OUT1

Ch. phase shift1

Synch. delay0

Synch. high A *

sIS(ON)

ISSY delay ON/OFF

Synch. delay2

Synch. high B *

Synch. high A *

Ch0

Ch1

Ch2

ISSY delay ON/OFF

* t

Synch. high A = 8 / (fPCLK or fINT)

* t

ISSY delay ON/OFF = 11 / (fPCLK or fINT)

* t

Synch. high B = 9 / (fPCLK or fINT)

ISSY

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