L6520 datasheet(13/19 Pages) STMICROELECTRONICS

13 / 19 page

L6520, L6521

Functions description

Doc ID 16998 Rev 3

13/19

5.8

Summary of protections

Figure 3.

Summary of protections

Table 7.

Table of faults

Fault

Active during

Condition

Ic behaviour

Required

action

PH Ign Run

Minimum

driving pulse

duration

Driving pulses shorter than 1

µs

- The drivers are stopped after

200 ms of minimum pulse

duration events

- The IC is shut down in low

consumption mode

VCC cycle

Inductor

saturation

HBCS TxL and TxM thresholds

crossed in less than 255 ns

Higher threshold crossing

LS driver turned off and a new

frequency is calculated.

If the situation is not recovered

after 200 ms, the IC is shut down

in low consumption mode

VCC cycle

Hard switching

PWM_det higher than 2.35 V at

LSD turn on

IC is shut down in low

consumption mode after 200 ms

of HSW events

VCC cycle

Overcurrent

HBCS TxL and TxM thresholds

crossing (different values during

ignition or run mode)

Frequency increase proportional

to the failure.

If the situation is not recovered

after 200 ms the IC is shut down

in low consumption mode

VCC cycle

End Of Life

EOL voltage outside the limits of

the window comparator

- Delay time started

- If EOL voltage is outside the

limits of the window comparator at

the end of the timer count than

the IC is shut down (latched)

VCC cycle

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