L6382D datasheet(13/22 Pages) STMICROELECTRONICS

13 / 22 page

L6382D

Application information

13/22

Summarizing:

–

the high-voltage start-up generator is active;

–VREF is disabled with additional sinking circuit on pin VREF enabled;

–

TPR is disabled;

–

OCP is disabled;

–

the drivers are disabled.

6.1.2

SAVE Mode

This mode is entered after the Vcc voltage reaches the turn-on threshold; the VREF is

enabled in low current source mode to supply the

µC connected to it, whose wake-up

required current must be less than 10mA: if no switching activity is detected at LGI input, the

high voltage start-up generator cycles ON-OFF keeping the Vcc voltage between VccON

and VccSM.

Summarizing:

–

the high-voltage start-up generator is cycling;

–VREF is enabled in low source current capability (IREF ≤ 10mA);

–

TPR circuit is disabled;

–

OCP is disabled;

–

the drivers are disabled.

If the Vcc voltage falls below the VREF(OFF) threshold, the device enters the start-up mode.

6.1.3

OPERATING Mode

After 10

µs in save mode and only if the voltage at V

REF is higher than 3.0V, on the falling

edge on the HGI input, the drivers are enabled as well as all the IC's functions; this is the

mode correspondent to the proper lamp behavior.

Summarizing:

–

HVSU is OFF

–VREF is enabled in high source current mode (IREF < 30mA)

–

TPR circuit is enabled

–

OCP is enabled

–

the drivers are enabled

If there is no switching activity on LGI for more than 100

µs, the IC returns in save mode.

6.1.4

Shut down

This state permits to manage the fault conditions in operating mode and it is entered by the

occurrence on one of the following conditions:

Vcc<VccOff (Under Voltage fault on Supply),

VREF<2.0V (Under Voltage fault on VREF)

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