L6382D datasheet(9/14 Pages) STMICROELECTRONICS

9 / 14 page

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L6382D

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.

4.1.3 OPERATING Mode

After 10

µs in save mode and only if the voltage at VREF 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.

4.1.4 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:

– 1. Vcc<VccOff (Under Voltage fault on Supply),

–2. VREF<2.0V (Under Voltage fault on VREF)

In this state the functions are:

■

The HVSU generator is ON

■

VREF is enabled in low source current mode (IREF < 10mA)

■

TPR is disabled

■

OCP is disabled

■

the drivers are disabled

In this state if Vcc reaches VccOn, the device enters the

save mode otherwise, if Vcc<VREF(OFF), also the

µC is turned off and the device will be ready to execute the Start-up sequence.

Figure 6. Timing Sequences: TPR behavior (left) Start-up, save mode and operating mode (right).

TPR(ON)

TPR(OFF)

VREF

LGI

PSW

Vcc

VCCon

VccSM

VREF

LGI

HVSU

Vcc

VCCon

HGI

µs

TPR Switching

VccOFF

LGI

OPERATING MODE

TPR(ON)

TPR(OFF)

VREF

LGI

PSW

Vcc

VCCon

VccSM

VREF

LGI

HVSU

Vcc

VCCon

HGI

µs

TPR Switching

VccOFF

LGI

OPERATING MODE

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