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參數(shù)資料
| 型號(hào)： | MIC2585-2MBTS TR |
| 廠商： | Micrel Inc |
| 文件頁數(shù)： | 21/28頁 |
| 文件大?。?/td> | 273K |
| 描述： | IC CTRLR HOT SWAP DUAL 24-TSSOP |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 類型： | 熱交換控制器 |
| 應(yīng)用： | 通用 |
| 內(nèi)部開關(guān)： | 無 |
| 電源電壓： | 1 V ~ 13.2 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 24-TSSOP（0.173"，4.40mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 24-TSSOP |
| 包裝： | 帶卷 (TR) |
| 其它名稱： | MIC2585-2MBTSTR MIC2585-2MBTSTR-ND |
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March 2005
21
MIC2584/2585
MIC2584/2585
Micrel
Input Overvoltage Protection
A similar design approach as the previous Undervoltage
Detection example is recommended for the overvoltage
protection circuitry, resistors R6 and R7 for OV1, in Figure 1.
For input overvoltage protection, the first consideration is to
establish the input voltage level that indicates an overvoltage
triggering a system (output voltage) shut down. For our
example, the input value for which the Channel 1 12V supply
will signal an output shutdown is 13.2V (+10%). Similarly,
from the previous example:
1) Choose R7 to satisfy 100礎(chǔ) condition.
R7
V
100 A
1.19V
100 A
11.9k
OV1(MIN)
e
?/DIV>
e
?/DIV>
e
&
R7 is chosen as 13.0k& ?%
2) Thus, following the previous example and
substituting R6 and R7 for R12 and R13,
respectively, V
OV1(MIN)
for V
FB1(MAX)
, and 13.2V
overvoltage for 10.5V output good, the same
formula yields R6 of 131.2k&. The nearest
standard 1% value is 130k&.
Now, consider the 12.6V maximum input voltage
(V
CC1
+5%), the higher tolerance for R7 and lower tolerance
for R6, 13.13k& and 128.7k&, respectively. With 12.6V input,
the voltage sensed at the OV1 pin is below V
OV1(MIN)
, and the
MIC2584/85 will not indicate an overvoltage condition until
V
CC1
exceeds approximately 13.2V considering the given
tolerances. A similar approach should be used for Channel 2.
PCB Connection Sense
There are several configuration options for the MIC2584/85s
ON pin to detect if the PCB has been fully seated in the
backplane before initiating a start-up cycle. In Figure 1, the
MIC2584/85 is mounted on the PCB with a resistive divider
network connected to the ON pin. R4 is connected to a short
pin on the PCB edge connector. Until the connectors mate,
the ON pin is held low which keeps the GATE output charge
pump off. Once the connectors mate, the resistor network is
pulled up to the input supply, 12V in this example, and the ON
pin voltage exceeds its threshold (V
ON
) of 1.235V and the
MIC2584/85 initiates a start-up cycle. In Figure 9, the connec-
tion sense consisting of a discrete logic-level MOSFET
and a few resistors allows for interrupt control from the
processor or other signal controller to shut off the output of the
MIC2584/85. R4 pulls the GATE of Q2 to V
IN
and the ON pin
is held low until the connectors are fully mated. Once the
connectors fully mate, a logic LOW at the /ON_OFF signal
turns Q2 off and allows the ON pin to pull up above its
threshold and initiate a start-up cycle. Applying a logic HIGH
at the /ON_OFF signal will turn Q2 on and short the ON pin
of the MIC2584/85 to ground which turns off the GATE output
charge pump.
GND
ON_OFF
C3
0.033礔
C4
0.01礔
SENSE1
VCC1
ON
CPOR
OUT1
FB1
GATE1
GND
/POR
CFILTER
/FAULT
Long
Pin
Backplane
Connector
PCB Edge
Connector
Long
Pin
Medium or
Short Pin
Undervoltage (Output) = 4.45V
/POR Delay = 16.5ms
START-UP Delay = 4ms
Circuit Breaker Response Time = 5ms
*Q2 is TN0201T (SOT-23)
Channel 2 and additional pins omitted for clarity.
Downstream
Signal
Short
Pin
PCB Connection Sense
Q1
Si7892DP
(PowerPAK" SO-8)
R5
10&
R7
10.5k&
1%
R4
20k&
R1
33k&
R3
33&
*Q2
MIC2584
C1
1礔
C2
0.01礔
C
LOAD1
1000礔
R2
33k&
R6
27.4k&
1%
V
OUT1
5V@7A
V
IN1
5V
/FAULT
11
9
7
8
16
15
12
13
6
10
14
R
SENSE1
0.005&
5%
1
2
3
4
Figure 9. PCB Connection Sense with ON/OFF Control
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| MIC2586-1BM | 功能描述:IC CTRLR/SEQ HOT SWAP 14-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 |
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| MIC2586-1YM TR | 功能描述:熱插拔功率分布 Positive High Voltage Hot-Swap Controller/Sequencer - 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 |
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