参数资料
型号: L6706
厂商: STMICROELECTRONICS
元件分类: 稳压器
英文描述: SWITCHING REGULATOR, QCC40
封装: 6 X 6 MM, ROHS COMPLIANT, VFQFPN-40
文件页数: 31/47页
文件大小: 623K
代理商: L6706
L6706
Output voltage monitor and protections
Doc ID 15698 Rev 2
37/47
15.5
Feedback disconnection
L6706 allows to protect the load from dangerous over voltage also in case of feedback
disconnection. The device is able to recognize both FB pin and FBG pin disconnections, as
shown in the Figure 21.
When VSEN pin is more than 500 mV higher then VPROG, the device recognize a FBG
disconnections. Viceversa, when CS- is more than 700 mV higher then VSEN, the device
recognize a FB disconnection.
In both of the previous condition the device stops switching with the MOSFETs permanently
OFF and drives high the OSC/FAULT pin. The condition is latched until VCC or OUTEN
cycled.
Figure 21.
Feedback disconnection
COMP
To GND_core
(Remote Sense)
ERROR
AMPLIFIER
FB
FBG
RF
CF
VSEN
I
DROOP
To VCC_core
(Remote Sense)
RFB
VPROG
VREF
FBG
GND DROP
RECOVERY
CP
L
DCR
PHASE
VOUT
CS+
CS-
R
C
Rg
FB
DISCONNECTED
700mV
FBG
DISCONNECTED
500mV
I
OS
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