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| 型号： | ADM1041A-EVALZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 21/56页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR ADM1041A |
| 标准包装： | 1 |
| 主要目的： | AC/DC，次级 |
| 输出及类型： | 1，非隔离 |
| 功率 - 输出： | 24W |
| 输出电压： | 12V |
| 电流 - 输出： | 2A |
| 输入电压： | 85 ~ 132VAC |
| 板类型： | 完全填充 |
| 已供物品： | 板，线缆，软件 |
| 已用 IC / 零件： | ADM1041A |
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ADM1041A
CURRENT SENSING
Current is typically sensed by a low value resistor in series with
the positive output of the power supply, positioned just before
the OrFET or diode. For high voltages (12 V and higher), this
resistor is usually placed in the negative load. A pair of closely
matched voltage dividers connected to Pins 2 and 3 divide the
common-mode voltage down to approximately 2.0 V. The
divider ratio must be the same as used in the local and remote
voltage-sense circuits. Alternatively, current may be sensed by a
current transformer (CT) connected to Pin 8. The ADM1041A
must be configured via the SMBus to select one or the other.
CURRENT-TRANSFORMER INPUT
The ADM1041A can also be configured to sense current by
using a CT connected to Pin 8. In this case, the resistive current
sense is disabled. A separate single-ended amplifier has two
possible sensitivities that are selected via the SMBus. If the CT
option is selected, the gain of the 1.0, 2.1 buffer that follows the
gain trim stage is no longer configurable and is fixed at 1.0.
The share driver amplifier has a total of 100 mV positive offset
built into it. To use the device in CT mode, it is necessary to
compensate for this additional 100 mV offset. This is achieved
by adding in a positive offset on the CT input. This also allows
any negative amplifier offsets in the CT chain to be nulled out.
This offset cancellation is achieved by sourcing a current
through a resistance on the ICT pin. The resistor value is 40 kΩ
and so for 100 mV of offset cancellation a current of 2.5 μA is
OrFET GATE
CURRENT
OrFET SOURCE
required. It is possible to fine trim this current via Register 15h,
Bits 4–0, step size 170 nA. For example, 2.5 μA ≈ 15 × 170 nA;
so the code for Register 15h is decimal 15 or 0Fh. Refer to the
Current Transformer parameter in the Specifications table for
CURRENT-SENSE CALIBRATION
Regardless of which means is used to sense the current, the end
result of the calibration process should produce the standard
current share signal between Pins 20 and 23, that is, 2.0 V at
100% load, excluding any additional share signal offset that
might be configured.
CURRENT-LIMIT ERROR AMPLIFIER
This is a low gain transconductance amplifier that takes its
input from one of the calibrated current stages described
previously. The amplifier requires only the output pin for loop
compensation, which typically consists of a series RC network-
to-common. A trimmable reference provides a wide range of
adjustment for the current limit. When the current signal
reaches the reference voltage, the output of the error amplifier
comes out of saturation and begins to drive a controlled current
source. The control threshold is nominally 1.0 V. This current
flows through a resistor in series with the trimmed voltage loop
signal and thereby attempts to increase the voltage signal above
the 1.5 V reference for that loop. The closed voltage loop reacts
by reducing the power supply’s output voltage and this results in
GAIN = 10
REG 17h b7
CURRENT-
SHARE
V REF
V DD
OFFSET
C S +
3
(V SHARE ,
IOUT = 0)
TO CURRENT-
SHARE DRIVE
C S –/FS
2
IRS/ICT
9R
AMPLIFIER
CURRENT
LIMIT TO
ICT
SET
CURRENT
SHARE
R
VOLTAGE
ERROR AMP
TRANSFORMER
CURRENT-
SENSE
8
40k Ω
V REF
CURRENT
ERROR AMP
CONFIGURATION
SET CURRENT-
LIMIT LEVEL
SET GAIN
CURRENT
TRANSFORMER
C CMP
4
Figure 13. Current Sense
Rev. 0 | Page 21 of 56
1.25V
0.5V
OCP
COMPARATOR
OCP
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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) |
| ADM1041ARQZ | 功能描述:IC PWR SUPP MON/LOAD SHAR 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) |
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