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參數資料
型號： MIC2586R-2BM TR
廠商： Micrel Inc
文件頁數： 17/22頁
文件大小： 492K
描述： IC CTRLR/SEQ HOT SWAP 14-SOIC
標準包裝： 2,500
類型： 熱交換控制器
應用： 通用
內部開關： 無
電源電壓： 10 V ~ 80 V
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 14-SOIC（0.154"，3.90mm 寬）
供應商設備封裝： 14-SOIC
包裝： 帶卷 (TR)
其它名稱： MIC2586R-2BMTR
MIC2586R-2BMTR-ND
icrel, Inc.
MIC2586/MIC2586R
 
 
ecember 2012
17
M9999-122012
 
Application Information
External ON/OFF Control
The MIC2586/MIC2586R has an ON pin input that is
used to enable the controller to commence a start-up
sequence upon card insertion or to disable controller
operation upon card removal. In addition, the ON pin
can be used to reset the MIC2586/MIC2586Rs internal
electronic circuit breaker in the event of a load current
fault. To reset the electronic circuit breaker, the ON pin
is toggled LOW then HIGH. The ON pin is internally
connected to an analog comparator with 80mV of
hysteresis. When the ON pin voltage falls below its
internal V
ONL
  threshold, the GATE pin is immediately
pulled low. The GATE pin will be held low until the ON
pin voltage is above its internal V
ONH
  threshold. The
external   circuit's   ON   threshold   voltage   level   is
programmed using a resistor divider (R1 and R2) as
shown in the typical application circuit. The equations to
set the trip points are shown below. For the following
example, the external circuit's ON threshold is set to
V
ONH(EX)
 = +37V, a value commonly used in +48V Central
Office power distribution applications.
 
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
+
?/DIV>
=
R2
R2
R1
V
ONH
ONH(EX)
 
Eq. 13
 
Given V
ONH
and R2, a value for R1 can be determined.
A suggested value for R2 is that which will provide
approximately 100礎 of current through the voltage
divider chain at V
CC
 = V
ONH
. This yields the following as
a starting point:
 
13.13k?/DIV>
100礎
1.313V
100礎
V
R2
ONH(TYP)
=
=
=
 
Eq. 14
 
The closest standard 1% value for R2 is 13k? Now,
solving for R1 yields:
 
. k?/DIV>
1
1.313V
37V
13k?/DIV>
1
V
V
R2
R1
ONH(TYP)
ONH(EX)

?/DIV>
=

?/DIV>
=
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
 
        
Eq.15
 
The closest standard 1% value for R1 is 357k?
Using standard 1% resistor values, the external circuit's
nominal ON and OFF thresholds are V
ON(EX)
= +36V and
V
OFF(EX)
= +34V. In solving for V
OFF(EX)
, replace V
ONH
 with
V
ONL
 in Equation 13.
Output Voltage PWRGD Detection
The MIC2586/86R includes an analog comparator used
to monitor the output voltage of the controller through an
external   resistor   divider   as   shown   in   the   typical
application circuit. The FB input pin is connected to the
non-inverting input and is compared against an internal
reference voltage. The analog comparator exhibits a
hysteresis of 80mV.
Setting the PWRGD threshold for the circuit follows a
similar approach as setting the circuit's ON/OFF input
voltage. The equations to set the trip points are shown
below. For the following +48V telecom application,
power-is-good output signal PWRGD1 (or /PWRGD1) is
to be de-asserted when the output supply voltage is
lower than +48V-10% (+43.2V):
 
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
R6
R6
+
R5
V
=
FBL
GOOD)
 
OUT(NOT
 
Eq.16
 
Given V
FBL
 and R6, a value for R5 can be determined. A
suggested value for R6 is that which will provide
approximately 100礎 of current through the voltage
divider chain at V
OUT(NOT GOOD)
  = V
FBL
. This yields the
following equation as a starting point:
 
12.33k?/DIV>
100礎
1.233V
100礎
V
R6
FBL(TYP)
=
=
=
 
Eq. 17
 
The closest standard 1% value for R6 is 12.4k&. Now,
solving for R5 yields:
 
422k?/DIV>
1
1.233V
43.2V
12.4k?/DIV>
1
V
V
R6
5
FBL(TYP)
GOOD)
 
OUT(NOT

?/DIV>
=

?/DIV>
=
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
 
 
 
 
Eq. 18
 
The closest standard 1% value for R5 is 422k&.
Using standard 1% resistor values, the external circuit's
nominal "power-is-good" and "power-is-not-good" output
voltages are V
OUT(GOOD)
  = +46V and V
OUT(NOT   GOOD)
  =
+43.2V
 
 
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