A8603KESTR-R datasheet(29/42 Pages) ALLEGRO

29 / 42 page

Multiple-Output Regulator for

Automotive LCD Displays

A8603

Allegro MicroSystems, LLC

115 Northeast Cutoff

Worcester, Massachusetts 01615-0036 U.S.A.

1.508.853.5000; www.allegromicro.com

Pre-Output Fault Detection

When EN = High and the A8603 output regulators are enabled

through I2C command, a startup sequence is followed before

the regulators are powered up. The sequence checks for extreme

conditions and proceeds as described in Table 16.

Step Number

Step Description

Fault Tripped?

Check VIN UVLO

A8603 remains powered-down until VIN is above VUVLO.

Power-up internal

rail

A8603 initializes.

Check internal rail

UVLO

BIAS charges internal rail indefinitely, until VBIAS is above UVLO.

Turn on AVDD

Enable AVDD and check to see if output reaches >90% of target voltage within tSS(TO).

Yes

Turn on VGL

Enable VGL and check to see if output reaches >90% of target voltage within tSS(TO).

Yes

Turn on VGH

Enable VGH and check to see if output reaches >90% of target voltage within tSS(TO).

Yes

Turn on VCOM

Enable VCOM and check to see if output reaches >90% of target voltage within tSS(TO).

Yes

Table 16: Pre-Output Fault Detection Sequence

General Fault Detection

The faults described in Table 17 are continuously monitored,

whether during startup, normal operation, or shutdown.

Table 17: General Fault Detection

Fault Description

A8603 Response to Fault

Fault Tripped?

AVDD, VCOM,VGH or VGL 20%

under target

Shutdown using shutdown sequence. Fault counter increased by one,

retry after tRESTART.

Yes: FAULT set during tRESTART.

AVDD, VCOM,VGH or VGL 20% over

target

Over target regulator rail shutdown immediately. Other regulator rails

shutdown using shutdown sequence. Fault counter increase by one

retry after tRESTART.

Yes: FAULT set during tRESTART.

Overcurrent limit for iAVDD, iVCOM, iVGH

or iVGL

Offending regulator rail goes into current fold-back or current limit.

Shutdown using shutdown sequency after tOCP. Fault counter increase

by one, retry after tRESTART.

Yes: FAULT set during tRESTART.

SW_OVP exceeded

Shutdown all regulators immediately without using shutdown sequence.

Fault counter increased by one, retry after tRESTART.

Yes: FAULT set during tRESTART.

External UVLO reached

Shutdown all regulators immediately without using shutdown sequence.

Fault counter reset to 0, retry after tRESTART.

Internal (Bias) UVLO

Shutdown all regulators immediately without using shutdown sequence.

Fault counter reset to 0, retry after tRESTART.

TSD exceeded

Shutdown all regulators immediately without using shutdown sequence.

Fault counter increase by one, retry after tRESTART.

Yes: FAULT set during tRESTART.

SWILIM2 (150% of cycle-by-cycle

limit) exceeded

Shutdown all regulators immediately without using shutdown sequence.

Fault counter increased by one, retry after tRESTART.

Yes: FAULT set during tRESTART.

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