- 您现在的位置：买卖IC网 > PDF目录22118 > ADM1075-1ACPZ-RL7 (Analog Devices Inc)IC HOT SWAP CTRLR -48V 28LFCSP PDF资料下载
参数资料
| 型号： | ADM1075-1ACPZ-RL7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 20/52页 |
| 文件大小： | 0K |
| 描述： | IC HOT SWAP CTRLR -48V 28LFCSP |
| 标准包装： | 1,500 |
| 类型： | 热交换控制器 |
| 应用： | -48V 远程电力系统，高可用性，电信/数据通信系统 |
| 内部开关： | 无 |
| 电流限制： | 可调 |
| 电源电压： | -35 V ~ -80 V |
| 工作温度： | -40°C ~ 105°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-WFQFN 裸露焊盘，CSP |
| 供应商设备封装： | 28-LFCSP-WQ（5x5） |
| 包装： | 带卷 (TR) |
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页第17页第18页第19页当前第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页第30页第31页第32页第33页第34页第35页第36页第37页第38页第39页第40页第41页第42页第43页第44页第45页第46页第47页第48页第49页第50页第51页第52页
I SHUNT _ MAX =
= 28 mA
V IN _ MAX / V SHUNT _ MIN
I MAX =
ADM1075
THEORY OF OPERATION
When circuit boards are inserted into a live backplane,
discharged supply bypass capacitors draw large transient
currents from the backplane power bus as they charge. Such
transient currents can cause permanent damage to connector
pins, as well as dips on the backplane supply that can reset other
boards in the system.
The ADM1075 is intended to control the powering on and off
of a board in a controlled manner, allowing the board to be
removed from, or inserted into, a live backplane by protecting it
from excess currents. The ADM1075 can reside either on the
backplane or on the removable board.
A minimal load current requirement is assumed when charging
the load capacitance. If the load current is too large relative to
the regulation current, it may not be possible to charge the load
capacitance. The PWRGD pin can be used to disable the load
until the load capacitance is fully charged.
POWERING THE ADM1075
The ADM1075 typically operates from a negative supply of
?35 V to ?80 V and can tolerate transient voltages of up to
?200 V. The VIN pin is a positive supply pin with respect to
chip ground. It is a current-driven supply and is shunt regulated
to 12 V internally. It should be connected to the most positive
supply terminal (usually ?48 V RTN or 0 V) through a dropper
resistor. The resistor should be chosen such that it always
supplies enough current to overcome the maximum quiescent
supply current of the chip while not exceeding the maximum
allowable shunt current. After the system supply range has been
established, an appropriate value for the dropper resistor can be
calculated.
Data Sheet
For example, the maximum shunt current with a TSSOP device
at 80°C maximum ambient can be calculated as
105 ° C / 80 ° C
68 ° C/W × 13 V
Tolerance of supplies and resistors should also be accounted for
to ensure that the shunt current is always within the desired range.
Care must be taken to ensure that the power rating of the shunt
resistor is sufficient. The power may be as high as 2 W at
extreme supply conditions. Multiple shunt resistors can be used
in series or in parallel to share power between resistors.
P R _ SHUNT = VI = ( V IN _ MAX / V SHUNT _ MIN ) × I MAX
where:
R SHUNT
The power dissipation in the shunt resistor can be saved if a
suitable voltage rail is available to power the chip directly. This
voltage rail must be well regulated to ensure that it is always
greater than the UVLO threshold but less than the minimum
shunt regulation voltage. The power directly without shunt
specification in Table 1 shows the limits this voltage rail must
meet. Note that this voltage is referenced to VEE.
The VIN pin provides the majority of the bias current for the
device. The remainder of the current needed to control the gate
drive and to best regulate the V GS voltage is supplied by the
SENSE± pins. The VEE and SENSE? pins are connected to the
same voltage rail, although through separate traces to prevent
R SHUNT _ MIN =
V IN _ MAX / V SHUNT _ MIN
I SHUNT _ MAX
–48V RTN
R SHUNT
C LOAD
V IN _ MIN / V SHUNT _ MAX
R SHUNT _ MAX =
I SHUNT _ MIN
where:
V IN_MIN and V IN_MAX are the supply voltage extremes (that is, 35 V,
1μF
VEE
VIN
ADM1075
GATE
SENSE+
Q1
R SENSE
T J ( MAX ) / T A ( MAX )
θ JA × VIN ( MAX )
80 V).
V SHUNT_MIN and V SHUNT_MAX are the shunt regulator voltage data
I SHUNT_MIN is the maximum quiescent supply current (minimum
shunt current).
I SHUNT_MAX is the maximum shunt input current.
I SHUNT_MAX can be calculated based on the maximum ambient
temperature (T A(MAX) ) in the application, the maximum junction
temperature (T J(MAX) = 105°C), and the θ JA value of the package
from Table 4. Worst-case internal power is at VIN (MAX) from
I SHUNT _ MAX =
SENSE–
VEE
Figure 42. Powering the ADM1075
The available shunt current range should be wide enough to
accommodate most telecommunication input voltage ranges.
In an application where a wider input voltage range is possible,
some external circuitry may be required to meet the shunt
regulation current specifications. The applications diagram in
diode and a bipolar junction transistor (BJT) device as an
external pre-regulator on the ?48 V supply. This ensures that
the shunt regulation current is always within specification even
at the extremes of supply voltage.
Rev. C | Page 20 of 52
相关PDF资料 |
PDF描述 |
|---|---|
| 2-530689-6 | CONN EDGE CARD 22POS DUAL SOLDER |
| LC4064V-75T100C | IC PLD 64MC 64I/O 7.5NS 100TQFP |
| VE-23N-EV-F1 | CONVERTER MOD DC/DC 18.5V 150W |
| GMM06DTKI-S288 | CONN EDGECARD 12POS .156 EXTEND |
| TAP105K035DTS | CAP TANT 1UF 35V 10% RADIAL |
相关代理商/技术参数 |
参数描述 |
|---|---|
| ADM1075-1ARUZ | 功能描述:IC CTRLR HOTSWAP -48V 28TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 热交换 系列:- 标准包装:50 系列:- 类型:热交换控制器 应用:-48V 远程电力系统，AdvancedTCA ? 系统，高可用性 内部开关:无 电流限制:可调 电源电压:11.5 V ~ 14.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽） 供应商设备封装:10-MSOP 包装:管件 |
| ADM1075-1ARUZ-RL7 | 功能描述:IC HOTSWAP CTRLR -48V 28TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 热交换 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:119 系列:- 类型:热交换控制器 应用:通用型，PCI Express? 内部开关:无 电流限制:- 电源电压:3.3V，12V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:80-TQFP 供应商设备封装:80-TQFP（12x12） 包装:托盘 产品目录页面:1423 (CN2011-ZH PDF) |
| ADM1075-2ACPZ | 功能描述:IC HOT SWAP CTRLR -48V 28LFCSP RoHS:是 类别:集成电路 (IC) >> PMIC - 热交换 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:119 系列:- 类型:热交换控制器 应用:通用型，PCI Express? 内部开关:无 电流限制:- 电源电压:3.3V，12V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:80-TQFP 供应商设备封装:80-TQFP（12x12） 包装:托盘 产品目录页面:1423 (CN2011-ZH PDF) |
| ADM1075-2ACPZ-RL7 | 功能描述:IC HOT SWAP CTRLR -48V 28LFCSP RoHS:是 类别:集成电路 (IC) >> PMIC - 热交换 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:119 系列:- 类型:热交换控制器 应用:通用型，PCI Express? 内部开关:无 电流限制:- 电源电压:3.3V，12V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:80-TQFP 供应商设备封装:80-TQFP（12x12） 包装:托盘 产品目录页面:1423 (CN2011-ZH PDF) |
| ADM1075-2ARUZ | 功能描述:IC CTRLR HOTSWAP -48V 28TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 热交换 系列:- 标准包装:50 系列:- 类型:热交换控制器 应用:-48V 远程电力系统，AdvancedTCA ? 系统，高可用性 内部开关:无 电流限制:可调 电源电压:11.5 V ~ 14.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽） 供应商设备封装:10-MSOP 包装:管件 |
发布紧急采购，3分钟左右您将得到回复。