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| 型号： | MIC2586R-2YM |
| 厂商： | Micrel Inc |
| 文件页数： | 15/22页 |
| 文件大小： | 492K |
| 描述： | IC CTRLR/SEQ HOT SWAP 14-SOIC |
| 标准包装： | 54 |
| 类型： | 热交换控制器 |
| 应用： | 通用 |
| 内部开关： | 无 |
| 电源电压： | 10 V ~ 80 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 14-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 14-SOIC |
| 包装： | 管件 |
| 产品目录页面： | 1085 (CN2011-ZH PDF) |
| 其它名称： | 576-2198 MIC2586R-2YM-ND |
icrel, Inc.
MIC2586/MIC2586R
ecember 2012
15
M9999-122012
Using parametric values for the MIC2586/MIC2586R, an
expression relating a worse-case design value for
C
TIMER
, using the MIC2586/MIC2586R specification
limits, to the circuit's turn-on delay time is:
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
=
?/DIV>
=
?/DIV>
=
sec
礔
10
94
t
1.280V
120礎
t
V
I
t
6
ON
TURN
TIMER(MAX)
ON
TURN
TIMER(MAX)
)
TIMERH(MIN
X)
TIMERUP(MA
ON
-
TURN
TIMER(MAX)
Eq. 6
For example, in a system with a C
LOAD
= 1000礔, a
maximum V
CC
= +72V, and a maximum load current on a
nominal +48V buss of 1.65A, the nominal circuit design
equations steps are:
1. Choose I
LIMIT
= I
HOT_SWAP(NOM)
= 2A (1.65A + 20%)
2. Select an R
SENSE
(Closest 1% standard value is
19.6m?
3. Using I
CHARGE
= I
LIMIT
= 2A, the application circuit
turn-on time is calculated using Equation 5:
(
)
36ms
2A
72V
1000?
ON
-
TURN
=
?/DIV>
=
Allowing for capacitor tolerances and a nominal 36ms
turn-on time, an initial worse-case value for C
TIMER
is:
3.38礔
sec
糉
10
94
0.036s
6
-
TIMER(MAX)
=
?/DIV>
?/DIV>
=
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
Eq. 7
The closest standard ?% tolerance capacitor value is
3.3礔 and would be a good initial starting value for
prototyping.
Whenever the MIC2586 is not in current limit, C
TIMER
is
discharged to GND by an internal 3.5礎 current sink
(I
TIMERDN
).
For the MIC2586R, the circuit breaker automatically
resets after (20) t
FLT_AUTO
time constants. If the fault
condition still exists, capacitor C
TIMER
will begin to charge
up to the V
TIMERH
threshold, and if exceeded, trip the
circuit breaker.
Capacitor C
TIMER
will then be discharged by I
TIMERDN
until
the voltage across C
TIMER
drops below the V
TIMERL
threshold, at which time another start cycle is initiated.
This will continue until any of the following occurs:
a) The fault condition is removed.
b) The input supply voltage power is removed/cycled
c) The ON pin is toggled LOW then HIGH.
The duty cycle of the auto-restart function is therefore
fixed at 5% and the period of the auto-restart cycle is
given by:
(
) (
)
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
=
?/DIV>
?/DIV>
=
?/DIV>
=
礔
ms
250
C
I
V
V
C
20
t
20
TIMER
RESTART
AUTO
TIMERUP
TIMERL
TIMERH
TIMER
RESTART
AUTO
FLT_AUTO
RT
AUTO_RESTA
Eq. 8
The auto-restart period for the example above where the
worse-case C
TIMER
was calculated to be 3.3礔 is:
825ms
RE TART
-
A T
=
Input Undervoltage Lockout
The MIC2586/MIC2586R have an internal undervoltage
lockout circuit that inhibits operation of the controllers
internal circuitry unless the power supply voltage is
stable and within an acceptable tolerance. If the supply
voltage to the controller with respect to ground is greater
than the V
UVH
threshold voltage (8V typical), the
controllers internal circuits are enabled and the
controller is then ready for normal operation pending the
state of the ON pin voltage. Once in steady-state
operation, the controllers internal circuits remain active
so long as the supply voltage with respect to ground is
higher than the controllers internal V
UVL
threshold
voltage (7.5V typical).
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