L6362A datasheet(28/37 Pages) STMICROELECTRONICS

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Protection and diagnostic

L6362A

28/37

DocID027660 Rev 4

Figure 13: Output current in overload condition

11.4

Deadtime

Deadtime protection is also known as cross-conduction or shoot-through protection. When

used in push-pull configuration, OUTH and OUTL pins are wired together. A deadtime is

necessary between each high-side switch (HS) turn-off and low-side switch (LS) turn-on,

and vice versa, in order to avoid cross-conduction of the two switches. The IC integrates a

deadtime generator to properly drive the output stage avoiding cross-conduction. The

deadtime is inserted only when the IN2 pin changes its state. The deadtime is not inserted

when IN1 or EN/DIAG pin changes its state. The IC must be driven by the IN2 pin in case

of push-pull configuration (OUTH and OUTL wired together). The IC should be driven by

IN1 in case of HS (OUTL left unconnected) or LS (OUTH left unconnected) configurations,

in order to avoid unnecessary delays when the output switch turns on. In any case, the

EN/DIAG pin can be also driven by an external source (for example a microcontroller).

11.5

EN/DIAG pin

The EN/DIAG pin is internally wired to a diagnostic open drain transistor, so it must be

driven by a series resistor only. The open drain transistor is active (turn-on) while any of the

following fault conditions is present, independently on the INx pin state:



Undervoltage lock-out (2.5 V < VCC < VUVOFF)



Overtemperature detected (TJ is above the threshold specified in Table 12: "Protection

and diagnostic"



The output turns off due to the cut-off protection see

Please note that in case of faults, the output stage (OUTH and OUTL) is disabled by an

internal path, independently on the status of the EN/DIAG pin. Besides, note that the

diagnostic signal is not visible if the EN/DIAG pin is pulled low from the microcontroller.

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