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L6722 датащи(PDF) 23 Page - STMicroelectronics

номер детали L6722
подробное описание детали  3 Phase controller for DC/DC converters
PDF  34 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L6722 датащи(HTML) 23 Page - STMicroelectronics

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L6722
9 Output voltage monitor and protections
23/34
Figure 12. output voltage protections and typical principle connections
9.4
Feedback disconnection
Output voltage i monitored by the device in two different points:
●
Remotely, through the remote buffer, across VSEN
●
Locally across the CS- pin (negligibly offset by
).
By comparing the voltage present at these two different locations, L6722 is able to understand
if the output voltage feedback is connected. When CS- is more than 1.375V higher than VSEN,
(See Figure 13) the device stops switching with the low side mosfets permanently ON and
drives high the FAULT pin. The condition is latched until VCC or INH cycled.
Figure 13. Feedback disconnection
VCC
+12V
+5V
SB
Vcc
UVLO
OVP
UVLO
VCC
Preliminary OVP Enabled
FBR Monitored
No Protection
Provided
(INH = Free)
OVP Protection
VSEN Monitored
(INH = 0)
Preliminary OVP
FBR Monitor
R
D
I
CS
⋅
L2
L1
L3
DCR1
DCR2
DCR3
CD
RD
RD RD
RG
PHASE3
PHASE2
PHASE1
VOUT
IINFO
CS_DROOP+
CS_DROOP-
FB
IDROOP
x 3
RF
CF
RFB
COMP
VSEN
FBR
FBG
VID
FB_DISCONNECTED
1V



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