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| 型号： | MIC2589-2YM |
| 厂商： | Micrel Inc |
| 文件页数： | 18/29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 |
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Micrel
MIC2589/MIC2595
December 2005
18
M9999-120505
(408) 955-1690
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
=
CNLD
NLD
CNLD
NLD
I
C
V
t
where V
CNLD
= 1.24V (typ); I
CNLD
= 25礎 (typ); and
C
NLD
is an external capacitor connected from Pin 6 to
VEE. Once the voltage on CNLD reaches its no-load
threshold voltage, V
CNLD
, the loop times out and the
controller will shut down until it is reset manually
(MIC2589/MIC2595) or until it performs an auto-retry
operation (MIC2589R/MIC2595R). During start-up, the
no-load detection circuit begins to monitor the load
current and the CNLD pin starts ramping along with
the GATE output. In order to keep the output from
shutting down, t
NLD
must be long enough to ensure
that the output MOSFET switches on to deliver the
required minimum load-detect current to the output
load before the no-load timer times out.
The Power-Good Output Signals
For
the
MIC2589/MIC2595-1
and
MIC2589R/MIC2595R-1, power-good output signal
PWRGD1 will be high impedance when V
DRAIN
drops
below V
PGTH
, and will pull-down to the potential at the
DRAIN when V
DRAIN
is above V
PGTH
. For the
MIC2589/95-2 and the MIC2589R/95R-2, power-good
output signal /PWRGD1 will pull down to the potential
of the DRAIN pin when V
DRAIN
drops below V
PGTH
and
will be high impedance when V
DRAIN
is above V
PGTH
.
Hence, the -1 parts have an active-high PWRGDX
signal and the -2 parts have an active-low /PWRGDX
output. PWRGDX (or /PWRGDX) may be used as an
enable signal for one or more following DC/DC
converter modules or for other system uses as
desired. When used as an enable signal, the time
necessary for the PWRGD (or /PWRGD) signal to
pull-up (when in high impedance state) will depend
upon the load (RC) that is present on this output.
Power-good output signals PWRGD2 (/PWRGD2) and
PWRGD3 (/PWRGD3) follow the assertion of
PWRGD1 (/PWRGD1) with a sequencing delay set by
an external capacitor (C
PG
) from the controllers
PGTIMER pin (Pin 2) to VEE. An expression for the
sequencing delay between PWRGD2 and PWRGD1
is given by:
PGTIMER
PG
)
THRESH(PG2
1
PGDLY2
I
C
V
t
?/DIV>
=
where VTHRESH(PG2) (= 0.63V, typically) is the
PWRGD2 threshold voltage for PGTIMER and I
PGTIMER
(= 45礎, typically) is the internal PGTIMER charge
current. Similarly, an expression for the sequencing
delay between PWRGD3 and PWRGD2 is given by:
PGTIMER
PG
)
THRESH(PG2
)
THRESH(PG3
2
PGDLY3
I
C
V
V
t
?/DIV>
=
where V
THRESH(PG3)
(1.15V, typical) is the PWRGD3
threshold voltage for PGTIMER. Therefore, power-
good output signal PWRGD2 (/PWRGD2) will be
delayed after the assertion of PWRGD1 (/PWRGD1)
by:
t
PGDLY2-1
(ms) 14 ?C
PG
(礔)
Power-good output signal PWRGD3 (/PWRGD3)
follows the assertion of PWRGD2 by a delay:
t
PGDLY3-2
(ms) 11.5 ?C
PG
(礔)
For example, for a 10礔 value for C
PG
, power-good
output signal PWRGD2 will be asserted 140ms after
PWRGD1. Power-good signal PWRGD3 will then be
asserted 115ms after
PWRGD2 and 255ms after
the
assertion of PWRGD1. The relationships between
V
DRAIN
, V
PGTH
, PWRGD1, PWRGD2, and PWRGD3
are shown in Figure 6.
Undervoltage/Overvoltage Detection (MIC2589 and
MIC2589R)
The MIC2589 and the MIC2589R have UV and OV
input pins that can be used to detect input supply rail
undervoltage
and
overvoltage
conditions.
Undervoltage lockout prevents the output from
switching on until the supply input is stable and within
tolerance. In a similar fashion, overvoltage shutdown
prevents damage to sensitive circuit components
should the input voltage exceed normal operating
limits. Each of these pins is internally connected to
analog comparators with 20mV of hysteresis. When
the UV pin falls below its V
UVL
threshold or the OV pin
is above its V
OVH
threshold, the GATE pin is
immediately pulled low. The GATE pin will be held low
until the UV pin is above its V
UVH
threshold and the OV
pin is below its V
OVL
threshold. The circuits UV and
OV threshold voltage levels are programmed using
the resistor divider R1, R2, and R3 as shown in the
Typical Application circuit and the equations to set
the trip points are shown below. The circuits UV
threshold is set to V
UV
= 37V and the OV threshold is
set at V
OV
= 72V, values commonly used in Central
Office power distribution applications.
)
(
)
(
)
R3
R3
R2
R1
(typ)
V
V
R3
R2
R3
R2
R1
(typ)
V
V
OVL
OV
UVL
UV
+
+
?/DIV>
=
+
+
+
?/DIV>
=
Given V
UV
, V
OV
, and any one of the resistor values,
the remaining two resistor values can be determined.
A suggested value for R3 is selected to provide
approximately 100礎 (or more) of current through the
voltage divider chain at V
DD
= V
UV
. This yields the
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参数描述 |
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| MIC2589-2YM 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 |
| MIC2589-2YM-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:闭锁故障 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-1BM | 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-1BM 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-1YM | 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 |
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