參數(shù)資料
型號(hào)： ADM1041AARQZ-REEL7
廠商： ANALOG DEVICES INC
元件分類： 通信及網(wǎng)絡(luò)
英文描述： Secondary-Side Controller with Current Share and Housekeeping
中文描述： SPECIALTY TELECOM CIRCUIT, PDSO24
封裝： LEAD FREE, MO-137AE, QSOP-24
文件頁(yè)數(shù)： 22/56頁(yè)
文件大?。?/td> 991K
代理商： ADM1041AARQZ-REEL7
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
during the timer operation. See Figure 15.
Rev. 0 | Page 22 of 56
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
1V
0
20
0
40
60
80
100%
V
SHARE
I
OUT
OFFSET
2V
0
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.
See Figure 15.
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
Differential Sense Amplifier section.
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.
See Figure 15.
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
limit. This small voltage increase also limits the control range of
the current-share circuit and is called the capture range. The
capture range may be set via the SMBus to one of four values,
from 1% to 4% nominal. See Figure 15.
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
Figure 15.
相關(guān)PDF資料
PDF描述
ADM1052 Precision Dual Voltage Regulator Controller
ADM1052JR Precision Dual Voltage Regulator Controller
ADM1060 DIP Socket; No. of Contacts:56; Pitch Spacing:0.07"; Row Spacing:0.6"; Terminal Type:PC Board; Leaded Process Compatible:Yes; Peak Reflow Compatible (260 C):No RoHS Compliant: Yes
ADM1060ARU CON-HDR64POS2ROW 4WALL.1X.1SP,RTANG,LOPF
ADM1064 Super Sequencer with Voltage Readback ADC
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ADM1041A-EVALZ 功能描述:BOARD EVAL FOR ADM1041A RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評(píng)估板 - DC/DC 與 AC/DC（離線）SMPS 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 主要目的:DC/DC，步降 輸出及類型:1，非隔離 功率 - 輸出:- 輸出電壓:3.3V 電流 - 輸出:3A 輸入電壓:4.5 V ~ 28 V 穩(wěn)壓器拓?fù)浣Y(jié)構(gòu):降壓 頻率 - 開關(guān):250kHz 板類型:完全填充 已供物品:板 已用 IC / 零件:L7981 其它名稱:497-12113STEVAL-ISA094V1-ND
ADM1041ARQ 功能描述:IC PWR SUPP MON/LOAD SHAR 24QSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 電源控制器，監(jiān)視器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 應(yīng)用:多相控制器 輸入電壓:- 電源電壓:9 V ~ 14 V 電流 - 電源:- 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:40-WFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:40-TQFN-EP（5x5） 包裝:帶卷 (TR)
ADM1041ARQ-2 制造商:Rochester Electronics LLC 功能描述: 制造商:Analog Devices 功能描述:
ADM1041ARQ-REEL 制造商:AD 制造商全稱:Analog Devices 功能描述:Secondary-Side Controller with Current Share and Housekeeping
ADM1041ARQ-REEL7 功能描述:IC PWR SUP MON/LOAD SHARE 24QSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 電源控制器，監(jiān)視器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 應(yīng)用:多相控制器 輸入電壓:- 電源電壓:9 V ~ 14 V 電流 - 電源:- 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:40-WFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:40-TQFN-EP（5x5） 包裝:帶卷 (TR)
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*