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L6738 データシート(PDF) 17 Page - STMicroelectronics

部品番号 L6738
部品情報  Single-phase PWM controller with light-load efficiency optimization
PDF  32 Pages
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メーカー  STMICROELECTRONICS [STMicroelectronics]
ホームページ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L6738 データシート(HTML) 17 Page - STMicroelectronics

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L6738
Output voltage setting and protections
Doc ID 18133 Rev 1
17/32
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



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