AN4243

Designing an application with the L6230

Doc ID 024199 Rev 1

17/29

Figure 14.

Overcurrent operation timing

The maximum value reached by the current depends on its slew-rate, thus on the state of

noticed that after the first current peak, the maximum value reached by the output current

becomes lower, because the capacitor on DIAG-EN pins is discharged starting from a lower

The following approximate relations estimate the disable time and the first OCD intervention

delay after the short-circuit (worst case).

The time the device remains disabled is:

Equation 11

where

Equation 12

The total intervention time is:

Equation 13

where

Equation 14

Output Current

Output Current

DIAG-EN

DIAG-EN

AM16576v1

t

DISABLE

t

OCD OFF

()

t

EN RISE

()

t

DON

()EN

++

=

t

EN RISE

()

R

EN

C

EN

I

n

V

DD

V

EN LOW

()

–

V

DD

V

TH ON

()

–

-------------------------------------------

⋅⋅

=

t

DELAY

t

OCD ON

()

t

EN FALL

()

t

DOF F

()EN

++

=

t

EN FALL

()

R

OPDR

C

EN

I

n

V

DD

V

TH OFF

()

-------------------------

⋅⋅

=