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參數資料
型號： MIC2587R-2BM TR
廠商： Micrel Inc
文件頁數： 17/22頁
文件大?。?/td> 972K
描述： IC CTRLR HOT SWAP POS HV 8-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： 8-SOIC（0.154"，3.90mm 寬）
供應商設備封裝： 8-SOIC
包裝： 帶卷 (TR)
其它名稱： MIC2587R-2BMTR
MIC2587R-2BMTR-ND
icrel, Inc.
MIC2587/MIC2587R
 
 
anuary 24, 2013
17
Revision 2.0
 
Application Information
External ON/OFF Control
The MIC2587/MIC2587R have 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 MIC2587/MIC2587Rs 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 & R2) as shown in the "Typical 
Application circuit. The equations  to set the trip points 
are shown below. For the example illustrated in Equation
8, the supply voltage needed to turn on the controller is
set to +37V, a value commonly used in +48V Central
Office power distribution applications.
 
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?nbsp   +
?/DIV>
=
R2
R2
R1
V
ONH
IN(ON)
 
Eq. 8
 
Given V
ONH
 and R2, a value for R1 can be determined. A
suggested value for R2 is that which will provide at least
100礎 of current through the voltage divider chain at V
CC
 
= V
ONH
. This yields the following as a starting point:
 
&
=
=
=
13.13k
A
100?/DIV>
1.313V
A
100?/DIV>
V
2
ONH(TYP)
 
 
The closest standard 1% value for R2 is 13k&. Now,
solving for R1 yields:
 
 
&
=
?/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>
=
k
 
353.3
1
1.313V
37V
13k
1
V
V
R2
1
ONH(TYP)
IN(ON)
 
 
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
IN(ON)
 = +36V and
V
IN(OFF)
 = +34V. In solving for V
IN(OFF)
, replace V
ONH
 with
V
ONL
 in Equation 8.
Output Voltage Power-is-Good Detection
The MIC2587/MIC2587R 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 Power-is-Good threshold for the circuit
follows a similar approach as setting the circuits ON/OFF
input voltage. The equations to set the trip points are
shown below. For the +48V telecom application shown in
Equation 9, power-is-good output signal PWRGD (or
/PWRGD) 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. 9
 
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:
 
k?/DIV>
 
12.33
100?
1.233V
100?
V
6
FBL(TYP)
=
=
=
     Eq. 10
 
The closest standard 1% value for R6 is 12.4k&. Now,
solving for R5 yields:
 
&
=
?/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>
=
k
 
422
1
1.233V
43.2V
12.4k
1
V
V
R6
5
FBL(TYP)
GOOD)
 
OUT(NOT
 
 
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. In solving for V
OUT(GOOD)
, substitute V
FBH
 for V
FBL
 
in Equation 9.
 
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