L6738

Output voltage setting and protections

Doc ID 18133 Rev 1

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6.2

Overcurrent threshold setting

The L6738 detects OC when the difference between CSP and CSN is equal to 20 mV (typ).

By properly designing the current reading network, it is possible to program the OC

threshold as desired (See

Figure 6).

Time constant matching is, in this case, designed considering:

This means that once inductor has been chosen, the two conditions above define the proper

values for R1 and R2.

Figure 6.

Current reading network

I

OCP

20mV

DCR

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

R1

R2

+

R2

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

⋅

=

L

DCR

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

R1//R2

() C

⋅

=

L

C

R1

CSP

CSN

R2 (Opt)

DCR