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參數(shù)資料
| 型號(hào)： | MIC2594-2BM |
| 廠商： | MICREL INC |
| 元件分類： | 電源管理 |
| 英文描述： | Replaced by PTH05060W : |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
| 封裝： | SOIC-8 |
| 文件頁(yè)數(shù)： | 12/14頁(yè) |
| 文件大?。?/td> | 83K |
| 代理商： | MIC2594-2BM |
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MIC2588/MIC2594
Micrel
M9999-122303
12
December 2003
R1, R2, and R3 as shown in the
“
Typca Appicaton.
”
The
equations to set the trip points are shown below. For the
following example, the circuit
’
s UV threshold is set to V
UV
= 37V
and the OV threshold is placed at V
OV
= 72V, values commonly
used in Central Office power distribution applications.
V
V
(typ)
R1+R2+R3
R2+R3
(
V
V
(typ)
R1+R2+R3
R3
UV
UVL
OV
OVH
=
×
(
)
)
=
×
(
)
Given V
UV
, V
OV
, and any one resistor value, the remaining
two resistor values can be found. A suggested value for R3
is that which will provide approximately 100
μ
A of current
through the voltage divider chain at V
DD
= V
UV
. This yields the
following as a starting point:
R3
V
(typ)
100 A
12.23k
OVH
=
=
The closest standard 1% value for R3 = 12.4k
. Solving for
R2 and R1 yields:
R2
R3
V
V
–
1
R2
12.4k
72V
37V
–
1
R2
11.729k
OV
UV
=
×
=
×
=
The closest standard 1% value for R2 = 11.8k
. Next, the
value for R1 is calculated:
R1 R3
V
–
1.223V
1.223V
–
R2
R1 12.4k
72V
–
1.223V
1.223V
–
R2
R1 705.808k
OV
×
×
The closest standard 1% value for R1 = 698k
.
Using standard 1% resistor values, the circuit
’
s nominal
UV and OV thresholds are:
V
UV
= 36.5V
V
OV
= 71.2V
Programmable UVLO Hysteresis
—
MIC2594
The MIC2594 has user-programmable hysteresis by means of
the ON and OFF pins. This allows setting the part to turn on at
a voltage V1, and not turn off until a second voltage V2, where
V2 < V1. This can significantly simplify dealing with source
impedances in the supply bus while at the same time increasing
the amount of available operating time from a loosely regulated
power supply (for example, a battery supply). Similarly to the
MIC2588, each of these pins is internally connected to an
analog comparator with 20mV of hysteresis. The MIC2594
holds the output off until the voltage at the ON pin exceeds its
V
ONH
threshold value given in the
“
Eectrca Characterstcs
”
table. Once the output has been enabled by the ON pin, it will
remain on until the voltage at 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 circuit
’
s turn-on and turn-off points are set using
the resistor divider R1, R2, and R3 as shown in the
“
Typca
Appicaton.
”
The equations to establish the trip points are
shown below. In the following example, the circuit
’
s ON thresh-
old is set to V
ON
=
40V and the circuit
’
s 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
×
(
)
×
(
)
)
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 approximately 100
μ
A of
current 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
=
The closest standard 1% value for R3 = 12.4k
.
Then, solving for R2 and R1 yields:
R2 =R3
V
V
–
1
R2 =12.4k
40V
35V
–
1
R2 =1.771k
ON
OFF
×
×
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
–
R2
R1= 391.380k
ON
×
(
)
×
(
)
The closest standard 1% value for R1 = 392k
.
Using standard 1% resistor values, the circuit
’
s nominal
ON and OFF thresholds are:
V
ON
= 40.1V
V
OFF
= 35V
相關(guān)PDF資料 |
PDF描述 |
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| MIC2595R-2BM | SINGLE-CHANNEL NEGATIVE HIGH VOLTAGE HOT SWAP POWER CONTROLLERS/SEQUENCERS |
| MIC2595R-1BM | SINGLE-CHANNEL NEGATIVE HIGH VOLTAGE HOT SWAP POWER CONTROLLERS/SEQUENCERS |
| MIC2589 | Replaced by PTH05060W : |
| MIC2589-1BM | Replaced by PTH05060W : |
| MIC2589-2BM | Replaced by PTH05060W : |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MIC2594-2BM TR | 功能描述:IC CTRLR HOT SWAP NEG HV 8-SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 產(chǎn)品培訓(xùn)模塊:Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:100 系列:- 類型:熱插拔開關(guān) 應(yīng)用:通用 內(nèi)部開關(guān):是 電流限制:可調(diào) 電源電壓:9 V ~ 13.2 V 工作溫度:-40°C ~ 150°C 安裝類型:表面貼裝 封裝/外殼:10-WFDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:10-TDFN-EP（3x3） 包裝:管件 |
| MIC2594-2YM | 功能描述:熱插拔功率分布 Negative Voltage Hot-Swap Controller - Lead Free RoHS:否 制造商:Texas Instruments 產(chǎn)品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
| MIC2594-2YM TR | 功能描述:熱插拔功率分布 Negative Voltage Hot-Swap Controller - Lead Free RoHS:否 制造商:Texas Instruments 產(chǎn)品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
| MIC2594-2YM-TR | 功能描述:Hot Swap Controller 1 Channel -48V 8-SOIC 制造商:microchip technology 系列:- 包裝:剪切帶（CT） 零件狀態(tài):停產(chǎn) 類型:熱交換控制器 通道數(shù):1 內(nèi)部開關(guān):無(wú) 應(yīng)用:-48V 特性:故障超時(shí)，閉鎖故障 可編程特性:限流，壓擺率，UVLO 電壓 - 電源:-80 V ~ -19 V 電流 - 輸出（最大值）:- 工作溫度:-40°C ~ 85°C 電流 - 電源:3mA 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 供應(yīng)商器件封裝:8-SOIC 功能引腳:DRAIN，OFF，ON，/PWRGD 標(biāo)準(zhǔn)包裝:1 |
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