- 您现在的位置：买卖IC网 > PDF目录22117 > ADM1276-3ACPZ-RL (Analog Devices Inc)IC HOT SWAP CTLR PMBUS 20LFCSP PDF资料下载
参数资料
| 型号： | ADM1276-3ACPZ-RL |
| 厂商： | Analog Devices Inc |
| 文件页数： | 22/48页 |
| 文件大小： | 0K |
| 描述： | IC HOT SWAP CTLR PMBUS 20LFCSP |
| 标准包装： | 5,000 |
| 类型： | 热交换控制器 |
| 应用： | 通用 |
| 内部开关： | 无 |
| 电流限制： | 可调 |
| 电源电压： | 2.95 V ~ 20 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-WQFN 裸露焊盘，CSP |
| 供应商设备封装： | 20-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页第20页第21页当前第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
ADM1276
Data Sheet
FAST RESPONSE TO SEVERE OVERCURRENT
SYSTEM CONTROL
V IN
ADM1276
The ADM1276 features a separate high bandwidth current
sense amplifier that is used to detect a severe overcurrent that
is indicative of a short-circuit condition. A fast response time
EN
D1
R1
UV
V IN
R SENSE
allows the ADM1276 to handle events of this type that could
otherwise cause catastrophic damage if not detected and acted
on very quickly. The fast response circuit ensures that the
ADM1276 can detect an overcurrent event at approximately
200% to 250% of the normal current limit (ISET) and can
respond to and control the current within 1 μs, in most cases.
UNDERVOLTAGE AND OVERVOLTAGE
The ADM1276 monitors the supply voltage for undervoltage
(UV) and overvoltage (OV) conditions. The UV and OV pins
are connected to the input of an internal voltage comparator,
and its voltage level is internally compared with a 1 V voltage
reference.
An external resistor network divides the supply voltage for moni-
toring. An undervoltage event is detected when the voltage
connected to the UV pin falls below 1 V, and the gate is shut
down using the 10 mA pull-down device. Similarly, when an
overvoltage event occurs and the voltage on the OV pin exceeds
1 V, the gate is shut down using the 10 mA pull-down device.
Q1
R2
Figure 50. Using the UV Pin as an Enable
Diode D1 prevents the external driver pull-up from affecting
the UV threshold. Select Diode D1 using the following criteria:
( V F × D1 ) + ( V OL × EN ) << 1.0 V ( I F = V IN / R1 )
Ensure that the EN sink current does not exceed the specified V OL
value. If the open-drain device has no pull-up, the diode is not
required.
POWER GOOD
The power good (PWRGD) output can be used to indicate
whether the output voltage is above a user-defined threshold
and can, therefore, be considered good. The PWRGD output is
derived using the FLB resistor network, composed of R1 and R2
The PWRGD pin is an open-drain output that pulls low when
the voltage at the FLB pin is lower than 1.1 × V ISET (power bad).
When the voltage at the FLB pin is above this threshold (indicating
SENSE+
SENSE–
that the output voltage has risen), the open-drain pull-down is
VCC
+
×50
–
ADM1276
disabled, allowing PWRGD to be pulled high. PWRGD is
guaranteed to be in a valid state for VCC ≥ 1 V.
UV
OV
+
1V –
–
1V +
IOUT
GATE
DRIVE
GATE
Hysteresis on the FLB pin is provided by a 2 μA internal current
source that is switched on when the V FLB input voltage exceeds the
input threshold. The current source is disconnected when V OUT
drops below the foldback threshold voltage minus the hysteresis
GND
Figure 49. Undervoltage and Overvoltage Supply Monitoring
ENABLE INPUT
The ADM1276 provides a dedicated ENABLE digital input pin.
voltage. Resistor R3 is internal to the ADM1276 . The hysteresis
voltage at the FLB pin can be varied by adjusting the parallel
combination of Resistor R1 and Resistor R2.
2μA
The ENABLE pin allows the ADM1276 to remain off by using a
hardware signal, even when the voltage on the UV pin is above
1.0 V and the voltage on the OV pin is less than 1.0 V. Although
V OUT
R1
FLB
R3
SWITCH IS ON WHEN
COMPARATOR OUTPUT IS HIGH
the UV pin can be used to provide a digital enable signal, using
the ENABLE pin for this purpose means that the ability to
monitor for undervoltage conditions is not lost.
In addition to the conditions for the UV and OV pins, the
ADM1276 ENABLE input pin must be high for the device
to begin a power-up sequence.
R2
1.3kΩ
1.1 × V ISET
Figure 51. Generation of PWRGD Signal
PWRGD
A similar function can be achieved using the UV pin directly.
Alternatively, if the UV divider function is still required, the
configuration shown in Figure 50 can be used.
Rev. C | Page 22 of 48
相关PDF资料 |
PDF描述 |
|---|---|
| R05P205S/P | CONV DC/DC 2W 05VIN 05VOUT |
| VI-22Y-CX-F2 | CONVERTER MOD DC/DC 3.3V 49.5W |
| 2-530666-6 | CONN LOW PRO 22 POS 156X200C/L |
| ESC08DRYS | CONN EDGECARD 16POS DIP .100 SLD |
| MIC2586R-2YM | IC CTRLR/SEQ HOT SWAP 14-SOIC |
相关代理商/技术参数 |
参数描述 |
|---|---|
| ADM1278-1AACPZ | 功能描述:Hot Swap Controller, Monitor 1 Channel General Purpose 32-LFCSP (5x5) 制造商:analog devices inc. 系列:- 包装:托盘 零件状态:有效 类型:热交换控制器，监控器 通道数:1 内部开关:无 应用:通用 特性:PMBus 可编程特性:自动重试，限流，故障超时，闭锁故障，OVP，压摆率，UVLO 电压 - 电源:4.5 V ~ 20 V 电流 - 输出（最大值）:- 工作温度:-40°C ~ 85°C 电流 - 电源:5.5mA 安装类型:表面贴装 封装/外壳:32-WFQFN 裸露焊盘，CSP 供应商器件封装:32-LFCSP（5x5） 功能引脚:- 标准包装:1 |
| ADM1278-1AACPZ-RL | 功能描述:Hot Swap Controller, Monitor 1 Channel General Purpose 32-LFCSP-WQ (5x5) 制造商:analog devices inc. 系列:- 包装:带卷（TR） 零件状态:有效 类型:热交换控制器，监控器 通道数:1 内部开关:无 应用:通用 特性:PMBus 可编程特性:自动重试，限流，故障超时，闭锁故障，OVP，压摆率，UVLO 电压 - 电源:4.5 V ~ 20 V 电流 - 输出（最大值）:- 工作温度:-40°C ~ 85°C 电流 - 电源:5.5mA 安装类型:表面贴装 封装/外壳:32-WFQFN 裸露焊盘，CSP 供应商器件封装:32-LFCSP-WQ（5x5） 功能引脚:- 标准包装:5,000 |
| ADM1278-1ACPZ | 功能描述:Hot Swap Controller, Monitor 1 Channel General Purpose 32-LFCSP (5x5) 制造商:analog devices inc. 系列:- 包装:托盘 零件状态:有效 类型:热交换控制器，监控器 通道数:1 内部开关:无 应用:通用 特性:PMBus 可编程特性:自动重试，限流，故障超时，闭锁故障，OVP，压摆率，UVLO 电压 - 电源:4.5 V ~ 20 V 电流 - 输出（最大值）:- 工作温度:-40°C ~ 85°C 电流 - 电源:5.5mA 安装类型:表面贴装 封装/外壳:32-WFQFN 裸露焊盘，CSP 供应商器件封装:32-LFCSP（5x5） 功能引脚:- 标准包装:1 |
| ADM1278-1ACPZ-RL | 功能描述:IC ENERGY MON HOT-SWAP 32-LFCSP 制造商:analog devices inc. 系列:- 包装:剪切带（CT） 零件状态:在售 类型:热交换控制器，监控器 通道数:1 内部开关:无 应用:通用 特性:PMBus 可编程特性:自动重试，限流，故障超时，闭锁故障，OVP，压摆率，UVLO 电压 - 电源:4.5 V ~ 20 V 电流 - 输出（最大值）:- 工作温度:-40°C ~ 85°C 电流 - 电源:5.5mA 安装类型:表面贴装 封装/外壳:32-WFQFN 裸露焊盘，CSP 供应商器件封装:32-LFCSP-WQ（5x5） 功能引脚:- 标准包装:1 |
| ADM1278-1BCPZ | 功能描述:Hot Swap Controller, Monitor 1 Channel General Purpose 32-LFCSP (5x5) 制造商:analog devices inc. 系列:- 包装:托盘 零件状态:有效 类型:热交换控制器，监控器 通道数:1 内部开关:无 应用:通用 特性:PMBus 可编程特性:自动重试，限流，故障超时，闭锁故障，OVP，压摆率，UVLO 电压 - 电源:4.5 V ~ 20 V 电流 - 输出（最大值）:- 工作温度:-40°C ~ 85°C 电流 - 电源:5.5mA 安装类型:表面贴装 封装/外壳:32-WFQFN 裸露焊盘，CSP 供应商器件封装:32-LFCSP（5x5） 功能引脚:- 标准包装:1 |
发布紧急采购，3分钟左右您将得到回复。