Datasheet

Output voltage setting and protections L6738A
18/32 Doc ID 18134 Rev 2
6.2 Overcurrent threshold setting
The L6738A 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