參數(shù)資料
型號： MIC2595R-2BM TR
廠商： Micrel Inc
文件頁數(shù)： 17/29頁
文件大?。?/td> 4205K
描述： IC CTRLR HOT SWAP NEG HV 14-SOIC
標(biāo)準(zhǔn)包裝： 2,500
類型： 熱交換控制器
應(yīng)用： 通用
內(nèi)部開關(guān)： 無
電源電壓： -19 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(yīng)商設(shè)備封裝： 14-SOIC
包裝： 帶卷 (TR)
其它名稱： MIC2595R-2BMTR
MIC2595R-2BMTR-ND
Micrel
MIC2589/MIC2595
 
 
December 2005 
17
M9999-120505
 (408) 955-1690
 
current limit is defined as the overcurrent fault
timer, t
FLT
, and is determined by the following
equation.
ARGE)
CFILTER(CH
ip)
CFILTER(tr
FILTER
FLT
I
V
C
t
?/DIV>
=
 
The value of C
FILTER
  should be selected to
allow the circuits minimum regulated value of
I
OUT
 to equal I
LIMIT
 for somewhat longer than
the time it takes to charge the total load
capacitance.
During startup, the CFILTER pin will begin to charge
once the GATE crosses 2.5V. In order to avoid false-
tripping   of   the   circuit   breaker   by   allowing   the
overcurrent filter to time out, the overcurrent delay
must be set to exceed the time it takes to ramp the
GATE output above 5.5V (i.e., charge the output load
capacitance).
An initial value for C
FILTER
 is found by calculating the
time   it   will   take   for   the   MIC2589/MIC2595   to
completely charge up the output capacitive load.
Assuming the load is enabled by the PWRGDX (or
/PWRGDX) signal(s) of the controller, the turn-on
delay time is derived from I = C ?(dv/dt):
(
)
LIMIT
EE
DD
LOAD
ON
TURN
I
V
V
C
t

?/DIV>
=

 
Using    parametric     values     specific     to     the
MIC2589/MIC2595, an expression relating C
FILTER
  to
the circuits turn-on delay time is:
(
)
CFILTER
CFILTER
ON
TURN
FILTER
V
I
t
C
?/DIV>
=

 
Substituting the variables above with the specification
limits of the MIC2589/MIC2595, an expression for the
worst-case value for C
FILTER
 is given by:
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
=
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
=



sec
礔
10
115
t
C
1.17V
135礎(chǔ)
t
C
6
ON
TURN
)
FILTER(max
ON
TURN
)
FILTER(max
 
For example, in a system with a C
LOAD
 = 1500?/SPAN>F, a 
maximum (V
DD
    V
EE
) = 72V, and a maximum load
current on a nominal 48V buss of 2.5A, the nominal
circuit design equations steps are:
1.   Choose I
LIMIT
 = I
HOT_SWAP
(nom) = 3A (2.5A + 20%);
2.   Select an
&
=
=
m
9
.
12
3A
38.8mV
R
SENSE
 (closest
1% standard value is 13.0m&);
3.   Using I
CHARGE
 = I
LIMIT
 = 3A, the application circuit 
turn-on time is calculated:
)
ms
6
3
3A
72V
1500礔
t
ON
TURN
=
?/DIV>
=

(use 40ms)
Allowing for capacitor tolerances and a nominal 40ms
turn-on time, an initial worst-case value for C
FILTER
 is:
C
FILTER(WORST-CASE)
 = 40ms?115?0
6
礔/sec) = 4.6礔
The closest standard ?0% tolerance capacitor value
is 4.7礔 and would be a good initial starting value for
prototyping.
Whenever the hot swap controller is not in current
limit, CFILTER is discharged to VEE by an internal
4礎(chǔ) current source.
For the MIC2589R/MIC2595R devices, the circuit
breaker automatically resets after approximately 25
t
FLT
  time constants (23.75 ? t
FLT_AUTO
). If the fault
condition still exists, capacitor C
FILTER
  will again
charge up to V
CFILTER(TRIP),
 tripping the circuit breaker.
Capacitor C
FILTER
  will then be discharged by an
internal 4礎(chǔ) current source until the voltage across
C
FILTER
  goes below V
CFILTER(RETRY)
, at which time
another start cycle is initiated. This will continue until
the fault condition is removed or input power is
removed/cycled. The duty cycle of the auto-restart
function is therefore fixed at 4.25% and the period of
the auto-restart cycle is given by:
(   )
(
)
[
]
)
I
 V
-
 
V
C
t
t
t
t
t
down
ll
CFILTER(pu
retry
CFILTER
IP)
CFILTER(TR
FILTER
FLT
RETRY
FLT_AUTO
FLT
RETRY

?/DIV>
+
=
+
=
 
The auto-restart period for the example above where
the worst-case C
FILTER
 was determined to be 4.7礔 is:
t
AUTO-RESTART
 = 1.27s
No-Load Detection
For applications in which a minimum load current will
always be present, the no-load detect capability of the
MIC2589 product family offers system designers the
ability to perform a shutdown operation on such fault
conditions, such as an unscheduled or unexpected
removal of PC boards from the system or on-board
fuse failure. As long as the minimum current drawn by
the load is at least 20% of the current limit (defined by
SENSE
TRIP
R
V
), the output of the hot swap controller will
remain enabled. If the output current falls below 20%
of the actual current limit, the controllers no-load
detection loop is enabled. In this loop, an internal
current source, I
CNLD
, will charge an external capacitor
C
NLD
. An expression for the controllers no-load time-
out delay is given by:
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