参数资料
| 型号： | ADM1041AARQZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 22/56页 |
| 文件大小： | 0K |
| 描述： | IC SECONDARY SIDE CTRLR 24QSOP |
| 产品变化通告： | Product Discontinuance 27/Oct/2011 |
| 标准包装： | 56 |
| 应用： | 次级侧控制器 |
| 电源电压： | 4.5 V ~ 5.5 V |
| 电流 - 电源： | 6mA |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 24-QSOP |
| 包装： | 管件 |
| 配用： | ADM1041-EVAL-ND - BOARD EVALUATION ADM1041 |
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ADM1041A
OVERCURRENT PROTECTION
When the current limit threshold is reached, the OCP com-
parator detects when the current error amplifier comes out of
saturation. Its threshold is nominally 0.5 V. This starts a timer
that, when it times out, causes an OCP condition to occur and
the power supply to shut down. If the current limit disappears
before the time has expired, the timer is reset. The time period
is configurable via the SMBus. Undervoltage blanking is applied
CURRENT SHARE
The current-share method is the master–slave type, which
means that the power supply with the highest output current
automatically becomes the master and controls the share bus
signal. All other power supplies become slaves, and the share
bus signal causes them to increase their output voltages slightly
until their output currents are almost equal to that of the
master. This scheme has two major advantages. A failed master
power supply simply allows one of the slaves to become the new
master. A short-circuited share signal disables current sharing,
but all power supplies default to their normal voltage setting,
allowing a certain degree of passive sharing. Because this chip
uses a low voltage process, an external bidirectional amplifier is
needed for most existing share bus signal levels. The voltage
between Pins 20 and 23 is always controlled to 2.0 V full scale,
ignoring any offset. By connecting Pins 20 and 23 together, the
chip can produce a 2.0 V share signal directly without any
external circuits. To improve accuracy, the share signal is
referenced to the remote voltage sense negative (VS-) pin.
3V
2V
V SHARE
1V
OFFSET
DIFFERENTIAL SENSE AMPLIFIER
This amplifier has unity gain and senses the difference between
the share bus voltage and the remote voltage sense negative pin.
When the power supply is the master, it forms a closed loop
with the I SHARE drive amplifier described previously, and
therefore it causes the share bus voltage between Pins 20 and 23
to equal the current-share signal at the noninverting input of
the I SHARE drive amplifier. When the power supply is a slave, the
output of the differential-sense amplifier exceeds the internal
current share signal, which causes the I SHARE drive amplifier to
be driven into cutoff. Because it is not possible to trim out
negative offsets in the op amps in the current-share chain, a
50 mV voltage source is used to provide a known fixed positive
offset. The share bus offset controlled current source must be
trimmed via the SMBus to take out the resulting overall offset.
I SHARE ERROR AMPLIFIER
This is a low gain transconductance amplifier that measures the
difference between the internal current share voltage and the
signal voltage on the external share bus. If two power supplies
have almost identical current-share signals, a 50 mV voltage
source on the inverting input helps arbitrate which power
supply becomes the master and prevents hunting between
master and slave roles. The amplifier requires only the output
pin for loop compensation, which typically consists of a series
RC network to common. When the power supply is a slave, the
output of the error amplifier comes out of saturation and begins
to drive a controlled current sink. The control threshold is
nominally 1.0 V. This current flows from a resistor in series
with the trimmed voltage loop signal and thereby attempts to
decrease the voltage signal below the 1.5 V reference for that
loop. The closed voltage loop reacts by increasing the power
supply’s output voltage until current share is achieved. The
maximum current sink is limited so that the power supply
voltage can be increased only a small amount, which is usually
limited to be within the customer’s specified voltage regulation
0
0
20
40 60
80 100%
limit. This small voltage increase also limits the control range of
I OUT
Figure 14. Load Share Characteristic
CURRENT-SHARE OFFSET
To satisfy some customer specifications, the current-share
signal can be offset by a fixed amount by using a trimmable
current generator and a series resistor. The offset is added
on top of the 2.0 V full-scale, current-share output signal.
I SHARE DRIVE AMPLIFIER
This amplifier is a buffer with enough current source capability
to drive the current-share circuits of several slave power
supplies. It has negligible current sink capability. Refer to the
the current-share circuit and is called the capture range. The
capture range may be set via the SMBus to one of four values,
I SHARE CLAMP
This clamp keeps the current share-loop compensation
capacitor discharged when the current share is not required to
operate. The clamp is released during power-up when the
voltage reference and therefore the output voltage of the power
supply has risen to either 75% or 88% of its final value. This is
configurable via the SMBus. When the clamp is released, the
current share loop slowly walks in the current share and helps
to avoid output voltage spikes during hot swapping. See
Rev. 0 | Page 22 of 56
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ADM1041AARQZ-REEL | 功能描述:IC SECONDARY SIDE CTRLR 24QSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 电源控制器，监视器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 应用:多相控制器 输入电压:- 电源电压:9 V ~ 14 V 电流 - 电源:- 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:40-WFQFN 裸露焊盘 供应商设备封装:40-TQFN-EP（5x5） 包装:带卷 (TR) |
| ADM1041AARQZ-REEL7 | 功能描述:IC SECONDARY SIDE CTRLR 24QSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 电源控制器，监视器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 应用:多相控制器 输入电压:- 电源电压:9 V ~ 14 V 电流 - 电源:- 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:40-WFQFN 裸露焊盘 供应商设备封装:40-TQFN-EP（5x5） 包装:带卷 (TR) |
| ADM1041A-EVALZ | 功能描述:BOARD EVAL FOR ADM1041A RoHS:是 类别:编程器，开发系统 >> 评估板 - DC/DC 与 AC/DC（离线）SMPS 系列:- 标准包装:1 系列:- 主要目的:DC/DC，步降 输出及类型:1，非隔离 功率 - 输出:- 输出电压:3.3V 电流 - 输出:3A 输入电压:4.5 V ~ 28 V 稳压器拓扑结构:降压 频率 - 开关:250kHz 板类型:完全填充 已供物品:板 已用 IC / 零件:L7981 其它名称:497-12113STEVAL-ISA094V1-ND |
| ADM1041ARQ | 功能描述:IC PWR SUPP MON/LOAD SHAR 24QSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 电源控制器，监视器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 应用:多相控制器 输入电压:- 电源电压:9 V ~ 14 V 电流 - 电源:- 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:40-WFQFN 裸露焊盘 供应商设备封装:40-TQFN-EP（5x5） 包装:带卷 (TR) |
| ADM1041ARQ-2 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Analog Devices 功能描述: |
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