- 您现在的位置：买卖IC网 > PDF目录19799 > MIC2589R-1YM (Micrel Inc)IC CTRLR HOT SWAP NEG HV 14-SOIC PDF资料下载
参数资料
| 型号： | MIC2589R-1YM |
| 厂商： | Micrel Inc |
| 文件页数： | 17/29页 |
| 文件大小： | 4205K |
| 描述： | IC CTRLR HOT SWAP NEG HV 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： | -19 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 |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页当前第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页
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
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 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 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:
相关PDF资料 |
PDF描述 |
|---|---|
| VI-B7Y-CY-F1 | CONVERTER MOD DC/DC 3.3V 33W |
| EMM44DSUN | CONN EDGECARD 88POS DIP .156 SLD |
| HIP1012ACBZA | IC CTRLRL HOT PLUG DUAL 14-SOIC |
| VI-B7Y-CX-F3 | CONVERTER MOD DC/DC 3.3V 49.5W |
| AYM22DTMS | CONN EDGECARD 44POS R/A .156 SLD |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MIC2589R-1YM TR | 功能描述:热插拔功率分布 Negative Voltage Hot-swap Controller - Lead Free RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube |
| MIC2589R-1YM-TR | 功能描述:Hot Swap Controller, Sequencer 1 Channel -48V 14-SOIC 制造商:microchip technology 系列:- 包装:剪切带（CT） 零件状态:过期 类型:热交换控制器，序列发生器 通道数:1 内部开关:无 应用:-48V 特性:自动重试 可编程特性:限流，故障超时，OVP，UVLO 电压 - 电源:-80 V ~ -19 V 电流 - 输出（最大值）:- 工作温度:-40°C ~ 85°C 电流 - 电源:4mA 安装类型:表面贴装 封装/外壳:14-SOIC（0.154"，3.90mm 宽） 供应商器件封装:14-SOIC 功能引脚:CFILTER，CNLD，DRAIN，PGTIMER，OV，PWRGD1，PWRGD2，PWRGD3，UV 标准包装:1 |
| MIC2589R-2BM | 功能描述:IC CTRLR HOT SWAP NEG HV 14-SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 热交换 系列:- 产品培训模块:Obsolescence Mitigation Program 标准包装:100 系列:- 类型:热插拔开关 应用:通用 内部开关:是 电流限制:可调 电源电压:9 V ~ 13.2 V 工作温度:-40°C ~ 150°C 安装类型:表面贴装 封装/外壳:10-WFDFN 裸露焊盘 供应商设备封装:10-TDFN-EP（3x3） 包装:管件 |
| MIC2589R-2BM TR | 功能描述:IC CTRLR HOT SWAP NEG HV 14-SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 热交换 系列:- 产品培训模块:Obsolescence Mitigation Program 标准包装:100 系列:- 类型:热插拔开关 应用:通用 内部开关:是 电流限制:可调 电源电压:9 V ~ 13.2 V 工作温度:-40°C ~ 150°C 安装类型:表面贴装 封装/外壳:10-WFDFN 裸露焊盘 供应商设备封装:10-TDFN-EP（3x3） 包装:管件 |
| MIC2589R-2YM | 功能描述:热插拔功率分布 Negative Voltage Hot-swap Controller - Lead Free RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube |
发布紧急采购，3分钟左右您将得到回复。