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参数资料
| 型号： | MIC2588-2BM TR |
| 厂商： | Micrel Inc |
| 文件页数： | 13/21页 |
| 文件大小： | 1079K |
| 描述： | IC CTRLR HOT SWAP NEG HV 8-SOIC |
| 标准包装： | 2,500 |
| 类型： | 热交换控制器 |
| 应用： | -48V Dist 电源系统，AdvancedTCA ? 系统 |
| 内部开关： | 无 |
| 电流限制： | 可调 |
| 电源电压： | -19 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： | MIC2588-2BMTR MIC2588-2BMTR-ND |
MIC2588/MIC2594
Micrel
M9999-083005
13
September 2005
the OFF pin falls below its V
OFFL
threshold value, or the part
turns off due to a fault. Should either event occur, the GATE
pin is immediately pulled low and will remain low until the
ON pin once again exceeds its V
ONH
threshold. The circuits
turn-on and turn-off points are set using the resistor divider
R1, R2, and R3 as shown in the Typical Application. The
equations to establish the trip points are shown below. In the
following example, the circuits nominal ON threshold is set to
V
ON
=
40V and the circuits nominal OFF threshold is
V
OFF
= 35V.
V =V (typ)
R1 R2 R3
R3
V
=V
(typ)
R1 R2 R3
R2 R3
ON
ONH
OFF
OFFL
?/DIV>
+ +
(
)
?/DIV>
+ +
(
)
+
(
)
Given V
OFF
, V
ON
, and any one resistor value, the remaining
two resistor values can be readily found. A suggested value
for R3 is that which will provide a minimum of 100礎 of cur-
rent through the voltage divider chain at V
DD
= V
OFF
. This
yields the following as a starting point:
R3=
V
(typ)
100 A
12.23k
OFFL
m
=
W
The closest standard 1% value for R3 = 12.4k?
solving for R2 and R1 yields:
R2 =R3
V
V
1
R2 =12.4k
40V
35V
1
R2 =1.771k
ON
OFF
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
W ?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
W
The closest standard 1% value for R2 = 1.78k?
R1=R3
V 1.223V
1.223V
R2
R1=12.4k
40V 1.223V
1.223V
1.78k&
R1= 391.380k
ON
?/DIV>
(
)
W ?/DIV>
(
)
W
The closest standard 1% value for R1 = 392k?
Using standard 1% resistor values, the circuits nominal
ON and OFF thresholds are:
V
ON
= 40.1V
V
OFF
= 35V
Good general engineering design practices must consider
the tolerances associated with these parameters, including
but not limited to, power supply tolerance, undervoltgae
and overvoltage tolerances, and the tolerances of the
external passive components.
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