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| 型號(hào)： | ADM1041AARQZ-REEL |
| 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 |
| 文件頁數(shù)： | 21/56頁 |
| 文件大?。?/td> | 991K |
| 代理商： | ADM1041AARQZ-REEL |
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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.
See Figure 13.
Rev. 0 | Page 21 of 56
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
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
more details. See Figure 13.
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
constant current operation. See Figure 13.
V
REF
V
REF
V
DD
SET CURRENT-
LIMIT LEVEL
TRANSFORMER
CURRENT-
SENSE
CONFIGURATION
CURRENT
TRANSFORMER
C
CMP
ICT
C
S
+
C
S
–/FS
GAIN = 10
CURRENT
CURRENT
LIMIT TO
VOLTAGE
ERROR AMP
IRS/ICT
SET
CURRENT
SHARE
CURRENT-
SHARE
OFFSET
(V
,
IOUT = 0)
CURRENT
ERROR AMP
TO CURRENT-
SHARE DRIVE
AMPLIFIER
1.25V
OCP
COMPARATOR
OCP
SET GAIN
40k
Ω
REG 17h b7
OrFET SOURCE
R
9R
0.5V
3
2
8
4
OrFET GATE
0
Figure 13. Current Sense
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| ADM1041AARQZ-REEL7 | 功能描述:IC SECONDARY SIDE CTRLR 24QSOP RoHS:是 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) |
| 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 |
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