- 您现在的位置：买卖IC网 > PDF目录1774 > ADM1041AARQZ-REEL7 (Analog Devices Inc)IC SECONDARY SIDE CTRLR 24QSOP PDF资料下载
参数资料
| 型号： | ADM1041AARQZ-REEL7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 21/64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： | 1,000 |
| 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： | 带卷 (TR) |
| 配用： | ADM1041-EVAL-ND - BOARD EVALUATION ADM1041 |
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页当前第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页第53页第54页第55页第56页第57页第58页第59页第60页第61页第62页第63页第64页
ADM1041
70
60
50
40
30
20
10
VOLTAGE ERROR AMPLIFIER
This is a high gain transconductance amplifier that takes its
input from the load voltage trim stage described previously. The
amplifier requires only the output pin for loop compensation,
which typically consists of a series RC network-to-common. A
parallel resistor may be added to common to reduce the open-
loop gain and thereby provide some output voltage droop as
output current increases. The output of the amplifier is typically
connected to an emitter follower that drives an optocoupler,
which in turn controls the duty of the primary side PWM. The
emitter follower should have a high gain to minimize loading
0
0
1
2
VOLTAGE (V)
3
4
effects on the amplifier. Alternatively, an op amp voltage
2.75
2.50
2.25
2.00
1.75
1.50
1.25
1.00
0.75
0.50
0.25
Figure 10. Current Limit
MAIN VOLTAGE REFERENCE
A 1.5 V reference is connected to the inverting input of the
voltage error amplifier. This 1.5 V reference is the output voltage
of the soft-start circuit. Under closed-loop conditions, the
voltage at the noninverting input is also controlled to 1.5 V.
During start-up, the output voltage should be ramped up in a
linear fashion at a rate that is independent of the load current.
This is achieved by digitally ramping up the reference voltage by
using a counter and a DAC. The ramp rate is configurable via
CURRENT SENSE AMPLIFIER
This is a two-stage differential amplifier that achieves low offset
0
1
10
100
1k
10k 100k
1M
10M
100M
and accuracy. The amplifier has the option to be chopped to
220
200
180
160
140
120
100
80
BANDWIDTH
Figure 11. V CMP Transconductance
reduce offset or left as a linear amplifier without chopping.
Refer to the Register Listing for more details. Its gain may be
selected from three ranges. It is followed by a trim stage and
then by a low gain buffer stage that can be configured with a
gain of 1.0 or 2.1. The result is a total of six overlapping gain
ranges (65 to 230), one of which must be selected via the SMBus.
This gives ample adjustment to compensate for the poor initial
tolerance of the resistance wires typically used for current
sensing. It also allows selecting a higher sensitivity for better
efficiency or a lower sensitivity for better accuracy (lower offset).
The amplifier offset voltage is trimmed to zero in a once-off
60
40
20
0
1
10
100
1k
10k 100k
1M
10M
100M
operation via the SMBus and uses a voltage controlled current
source at the output of the first gain stage. A second controlled
current source is used to trim out the additional offset due to
the mismatch of the external divider resistors. This offset trim is
dynamically adjusted according to the common-mode voltage
BANDWIDTH
Figure 12. C CMP and S CMP Transconductance
present at the top of the voltage dividers. Six ranges are selectable
according to the magnitude and polarity of this offset component.
Because the offset compensation circuit itself has some inaccu-
racies, the best overall current sense accuracy is obtained by
using more closely matched external dividers and then selecting
Rev. A | Page 21 of 64
相关PDF资料 |
PDF描述 |
|---|---|
| ADM1041AARQZ | IC SECONDARY SIDE CTRLR 24QSOP |
| ADM1060ARU | IC SUPERVIS/SEQUENC 7-CH 28TSSOP |
| ADM1062ACPZ-REEL7 | IC SEQUENCER/SUPERVISOR 40LFCSP |
| ADM1063ASUZ | IC SUPERVISOR/SEQUENCER 48-TQFP |
| ADM1064ACPZ | IC SEQUENCER/SUPERVISOR 40-LFCSP |
相关代理商/技术参数 |
参数描述 |
|---|---|
| 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: |
| ADM1041ARQ-REEL | 制造商:AD 制造商全称: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 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) |
发布紧急采购，3分钟左右您将得到回复。