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参数资料
| 型号： | LTC4252A-2CMS#PBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 电源管理 |
| 英文描述： | Negative Voltage Hot Swap Controllers; Package: MSOP; No of Pins: 10; Temperature Range: 0°C to +70°C |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO10 |
| 封装： | LEAD FREE, PLASTIC, MSOP-10 |
| 文件页数： | 27/36页 |
| 文件大小： | 394K |
| 代理商： | LTC4252A-2CMS#PBF |
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LTC4252-1/LTC4252-2
LTC4252A-1/LTC4252A-2
33
425212fb
The internal fault latches of the LTC4252 are disabled as
the TIMER pin is always held low by the SS voltage when
Q2 and Q3 are in analog current limit.
If both power supplies from channel A and B are exactly
equal, then equal load current will flow through Q2 and Q3
to the load module via the Hot Swap section.
If the channel A supply is greater than the channel B by
more than 100mV, the sense voltage will rise above the
fast comparator trip threshold of 200mV, the GATE will be
pulled low and Q2 is turned off. The GATE ramps up and
regulates Q2 when the channel A supply is equal to the
channel B supply. Likewise, if the channel B supply is
greater than channel A by more than 100mV, it trips the
fast comparator and GATE is pulled low and Q3 is turned
off. The GATE ramps up and regulates Q3 when the
channel B supply is equal to the channel A supply.
Resistors R4, R7 and external FETs Q4 and Q7 limit the
current flow into Q5 and Q8 during their respective supply
source short. When the channel A supply is shorted to the
– 48V RTN (or GND), large current flows into Q4 momen-
tarily and creates a voltage drop across R4, which in turn
reduces the gate-to-source voltage of Q4, limiting the
current flow. The sense voltage is lifted up and causes the
fast comparator of LTC4252 to trip and pull the GATE low
instantly. The channel A supply short will not cause Q3 of
channel B diode-OR circuit to turn off.
Similarly, when the channel B supply is shorted to the
– 48V RTN (or GND), large current flows into Q7 momen-
tarily and creates a voltage drop across R7, which in turn
reduces the gate-to-source voltage of Q7, thus limiting the
current flow. The increase in sense voltage will trip the fast
comparator of LTC4252 and pull the GATE low instantly.
The channel B supply short will not cause Q2 of channel A
diode-OR circuit to turn off. The load short at the output of
Q1 is protected by the Hot Swap section.
Using an EMI Filter Module
Many applications place an EMI filter module in the power
path to prevent switching noise of the module from being
injected back onto the power supply. A typical application
using the Lucent FLTR100V10 filter module is shown in
Figure 23. When using a filter, an optoisolator is required
to prevent common mode transients from destroying the
PWRGD and ON/OFF pins.
APPLICATIO S I FOR ATIO
WU
U
4252-1/2 F20
UV
OV
VEE
VIN
SENSE
SS
TIMER
GATE
PWRGD
DRAIN
LTC4252A-1
R1
390k
1%
R2
30.1k
1%
CT
0.68
F
CSS
68nF
CC
10nF
–48V
RS
0.02
Q1
IRF530S
1N4003
VIN
+
C2
0.1
F
100V
VIN
–
VOUT
+
VOUT
–
RC
10
R3
5.1k
RIN
3
× 1.8k
1/4W
1
9
8
10
3
2
7
6
4
5
C1
10nF
CIN
1
F
–48V RTN
(SHORT PIN)
–48V RTN
(LONG PIN)
RD
1M
*MOC207
*
+
C3
0.1
F
100V
C4
100
F
100V
C6
100
F
16V
C5
0.1
F
100V
LUCENT
FLTR100V10
CASE
VIN
+
ON/OFF
VIN
–
VOUT
+
1
2
45
6
7
8
9
5V
3
SENSE+
SENSE–
TRIM
VOUT
–
LUCENT
JW050A1-E
CASE
+
Figure 23. Typical Application Using a Filter Module
相关PDF资料 |
PDF描述 |
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| LTC4252A-2CMS#TRPBF | Negative Voltage Hot Swap Controllers; Package: MSOP; No of Pins: 10; Temperature Range: 0°C to +70°C |
| LTC4252A-2IMS#PBF | Negative Voltage Hot Swap Controllers; Package: MSOP; No of Pins: 10; Temperature Range: -40°C to +85°C |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC4252A-2CMSTR | 制造商:LINER 制造商全称:Linear Technology 功能描述:Negative Voltage Hot Swap Controllers |
| LTC4252A-2CMSTRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Negative Voltage Hot Swap Controllers |
| LTC4252A-2IMS | 功能描述:IC CTRLR HOTSWAP NEG VOLT 10MSOP 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 |
| LTC4252A-2IMS#PBF | 功能描述:IC CNTRLR HOTSWAP NEGVOLT 10MSOP RoHS:是 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 |
| LTC4252A-2IMS#TR | 功能描述:IC CTRLR HOTSWAP NEG VOLT 10MSOP 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 |
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