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| 型号： | MIC2587R-1BM TR |
| 厂商： | Micrel Inc |
| 文件页数： | 15/22页 |
| 文件大小： | 972K |
| 描述： | IC CTRLR HOT SWAP POS HV 8-SOIC |
| 标准包装： | 2,500 |
| 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： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOIC |
| 包装： | 带卷 (TR) |
| 其它名称： | MIC2587R-1BMTR MIC2587R-1BMTR-ND |
icrel, Inc.
MIC2587/MIC2587R
anuary 24, 2013
15
Revision 2.0
Using parametric values for the MIC2587/MIC2587R, an
expression relating a worst-case design value for C
TIMER
,
using the MIC2587/MIC2587R 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.
糉
10
94
t
1.280V
120?
t
V
I
t
6
ON
TURN
TIMER(MIN)
ON
TURN
TIMER(MIN)
)
TIMERH(MIN
)
TIMERH(MAX
ON
TURN
TIMER(MIN)
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 initial steps for the
circuit design are:
" Choose I
LIMIT
= I
HOT_SWAP(nom)
= 2A (1.65A + 20%)
" Select an R
SENSE
(Closest 1% standard value is
19.6m&)
" Using I
CHARGE
= I
LIMIT
= 2A, the application circuit turn-
on time is calculated using Equation 5:
(
)
36ms
2A
72V
1000礔
ON
-
TURN
=
?/DIV>
=
" Allowing for capacitor tolerances and a maximum
36ms turn-on time, an initial worst-case value for
C
TIMER
is:
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
=
sec.
糉
6
10
94
0.036s
C
TIMER(MIN)
= 3.3礔
A standard 3.3礔 ?% tolerance capacitor would be a
good initial starting value for prototyping since this value
would allow the controller to start up without nuisance
tripping over the entire voltage range given in the
example application.
Auto-Retry Period
For the MIC2587R, once the overcurrent timer times out
and the circuit breaker trips , the TIMER pin begins to
discharge. Once the timer pin voltage discharges below
the V
TIMERL
threshold, the circuit breaker resets to initiate
another start-up cycle. If the overcurrent fault condition is
still present, then the auto-retry cycle will continue until
either of the following occurs: a) the fault condition is
removed, b) the input supply voltage power is
removed/recycled, or c) the ON pin is toggled LOW then
HIGH. The duty cycle of the auto-restart function is
therefore fixed at 5% and the nominal period of the auto-
restart cycle is given by:
(
) (
)
TIMERH
TIMERL
TIMERH
TIMER
RETRY
-
AUTO
I
V
V
C
20
?/DIV>
?/DIV>
=
t
AUTO-RETRY
(ms)
= 250 ?/SPAN> C
TIMER
(礔)
Eq. 7
The auto-restart period for the example above where the
worst-case C
TIMER
was calculated to be 3.3礔 is:
t
AUTO-RETRY
= 825ms
The typical auto-restart period for several standard value
capacitors is listed in Table 2.
Table 2. Auto-Restart Period for Several Standard
Capacitor Values
C
TIMER
(礔)
t
AUTO-RETRY
(ms)
0.1
25
0.22
55
0.33
82.5
0.47
117.5
1.0
250
2.2
550
3.3
825
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