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參數資料
型號: MIC2310-2ZTS TR
廠商: Micrel Inc
文件頁數: 25/34頁
文件大小: 473K
描述: IC HOT SWAP CTLR 2CHAN 24TSSOP
標準包裝: 2,500
類型: 熱交換控制器
應用: 通用
內部開關:
電流限制: 可調
電源電壓: 10.8 V ~ 13.2 V
工作溫度: 0°C ~ 70°C
安裝類型: 表面貼裝
封裝/外殼: 24-TSSOP(0.173",4.40mm 寬)
供應商設備封裝: 24-TSSOP
包裝: 帶卷 (TR)
Micrel, Inc.
MIC2310
 
 
July 2008 
25
M9999-070108-A
 
Shorted C
PRIMARY
 Detector Asserts HW_FLT at
Start-up
In order to protect the system from the result of the
installation of a shorted or excessively large C
PRIMARY
 
capacitor on the PCB, the controller incorporates a
shorted   C
PRIMARY
   detection   scheme.   A   shorted
CPRIMARY pin or an excessively large C
PRIMARY
 
capacitor will impact the primary OC detection time,
t
POC.
 The operation of the shorted C
PRIMARY
 detection
scheme at start-up is described in Figure 12. Prior to
power-up, the CPRIMARY pin is discharged to 0V. As
the applied V
CC
 supply and the internal V
REG
 voltage
rise,   a   3mA   current   source   is   applied   to   the
CPRIMARY pin to charge C
PRIMARY
 to V
REG
. When the
internal   V
REG
   voltage   is   above   the   controllers
V
VREG(UVLOH)
   threshold   voltage,   the   t
POR
   timer   is
initiated. For the case of a reasonable C
PRIMARY
 
capacitor value, one which keeps the primary OC
response time, t
POC
, less than 0.5s, C
PRIMARY
 charges
above V
PRIH
  before the POR timer terminates and
normal   operation   commences.   However,   if   the
CPRIMARY pin is shorted to GND or C
PRIMARY
 is too
large, as in this timing diagram, the POR timer
terminates before C
PRIMARY
 charges above V
PRIH
 and a
shorted C
PRIMARY
 is detected. When a C
PRIMARY
 short is
detected, the GATE drive circuit and the DISCH
output are not affected, however, the HW_FLT digital
output is asserted. To repair the damaged C
PRIMARY
 
capacitor and reset the HW_FLT digital output, the
service processor instructs the main supply to turn off
the V
CC
 supply voltage to the controller such that V
REG
 
falls below the controllers V
VREG(UVLOL)
  threshold
voltage.
 
 
V
CC
 & V
REG
ENABLE
GATE
V
OUT
I
LOAD
PWRGD
CPRIMARY
HW_FLT
DISCH
V
VREG(UVLOL)
V
VREG(UVLOH)
V
VREG(UVLOH)
V
GSPGH
V
PGH
V
GSPGH
tPOR
VPRIH
CPRIMARY TOO LARGE
VPRIH
t
POR
SMALLER CPRIMARY
V
PGL
 
 
Figure 12. Shorted C
PRIMARY
 Detector Asserts HW_FLT at Start-up
 
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