- 您现在的位置：买卖IC网 > PDF目录1214 > EVAL-ADUM3471EBZ (Analog Devices Inc)EVALUATION MODULE FOR ADUM3471 PDF资料下载
参数资料
| 型号： | EVAL-ADUM3471EBZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 30/36页 |
| 文件大小： | 0K |
| 描述： | EVALUATION MODULE FOR ADUM3471 |
| 标准包装： | 1 |
| 系列： | iCoupler® |
| 主要目的： | 接口，数字式隔离器 |
| 嵌入式： | 否 |
| 已用 IC / 零件： | ADuM3470，ADuM3471，ADuM3472，ADuM3473，ADuM3474 |
| 主要属性： | 2 个独立的 ADuM347x 电路 |
| 次要属性： | 3.3 V ~ 5.5 V 电源 |
| 已供物品： | 板 |
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页当前第30页第31页第32页第33页第34页第35页第36页
ADuM3470/ADuM3471/ADuM3472/ADuM3473/ADuM3474
Data Sheet
POWER CONSUMPTION
The V DD1 power supply provides power to the i Coupler data
channels, as well as to the power converter. For this reason,
the quiescent currents drawn by the power converter and the
primary and secondary I/O channels cannot be determined
separately. All of these quiescent power demands are combined
The total I DD1 supply current is equal to the sum of the quiescent
operating current; the dynamic current, I DD1 (D) , demanded by
the I/O channels; and any external I ISO load.
The preceding analysis assumes a 15 pF capacitive load on each
data output. If the capacitive load is larger than 15 pF, the additional
current must be included in the analysis of I DD1 and I ISO (LOAD) .
POWER CONSIDERATIONS
Soft Start Mode and Current-Limit Protection
When the ADuM347x device first receives power from V DD1 , it is
in soft start mode, and the output voltage, V ISO , is increased
gradually while it is below the start-up threshold. In soft start
mode, the width of the PWM signal is increased gradually by
the primary converter to limit the peak current during V ISO
I DD1 (Q)
I DD1 (D)
PRIMARY
CONVERTER
I DDP (D)
FB
SECONDARY
CONTROLLER
I ISO (D)
I ISO
power-up. When the output voltage is larger than the start-up
threshold, the PWM signal can be transferred from the second-
ary controller to the primary converter, and the dc-to-dc converter
switches from soft start mode to the normal PWM control mode.
If a short circuit occurs, the push-pull converter shuts down for
PRIMARY
DATA
I/O
4CH
SECONDARY
DATA
I/O
4CH
approximately 2 ms and then enters soft start mode. If, at the end
of soft start, a short circuit still exists, the process is repeated,
which is called hiccup mode. If the short circuit is cleared, the
ADuM347x device enters normal operation.
Figure 45. Power Consumption Within the ADuM347x
Dynamic I/O current is consumed only when operating a channel
at speeds higher than the refresh rate of f r . The dynamic current
of each channel is determined by its data rate. Figure 18 and
and Figure 23 show the current for a channel in the reverse direc-
tion, meaning that the input is on the secondary side of the part.
15 pF output load.
The following relationship allows the total I DD1 current to be
I DD1 = ( I ISO × V ISO )/( E × V DD1 ) + Σ I CHn ; n = 1 to 4 (1)
where:
I DD1 is the total supply input current.
I ISO is the current drawn by the secondary side external load.
E is the power supply efficiency at the given output load from
I CHn is the current drawn by a single channel, determined from
channel direction.
The maximum external load can be calculated by subtracting
the dynamic output load from the maximum allowable load.
I ISO (LOAD) = I ISO (MAX) ? Σ I ISO (D)n ; n = 1 to 4 (2)
where:
I ISO (LOAD) is the current available to supply an external secondary
side load.
I ISO (MAX) is the maximum external secondary side load current
available at V ISO .
I ISO (D)n is the dynamic load current drawn from V ISO by an
The ADuM347x devices also have a pulse-by-pulse current
limit, which is active in startup and normal operation. This
current limit protects the primary switches, X1 and X2, from
exceeding approximately 1.2 A peak and also protects the
transformer windings.
Data Channel Power Cycle
The ADuM347x data input channels on the primary side and
the data input channels on the secondary side are protected from
premature operation by UVLO circuitry. Below the minimum
operating voltage, the power converter holds its oscillator inactive,
and all input channel drivers and refresh circuits are idle. Outputs
are held in a low state to prevent transmission of undefined states
during power-up and power-down operations.
During application of power to V DD1 , the primary side circuitry
is held idle until the UVLO preset voltage is reached. At that time,
the data channels are initialized to their default low output state
until they receive data pulses from the secondary side.
The primary side input channels sample the input and send a
pulse to the inactive secondary output. The secondary side
converter begins to accept power from the primary, and the V ISO
voltage starts to rise. When the secondary side UVLO is reached,
the secondary side outputs are initialized to their default low state
until data, either a transition or a dc refresh pulse, is received from
the corresponding primary side input. It can take up to 1 μs after
the secondary side is initialized for the state of the output to
correlate with the primary side input.
Secondary side inputs sample their state and transmit it to the
primary side. Outputs are valid one propagation delay after the
secondary side becomes active.
Rev. A | Page 30 of 36
相关PDF资料 |
PDF描述 |
|---|---|
| EVAL-ADUM4160EBZ | EVALUATION MODULE FOR ADUM4160 |
| EVAL-ADUM4223AEBZ | BOARD EVAL FOR ADUM4223 |
| EVAL-ADUMQSEBZ | EVAL BOARD FOR ICOUPLER SMD |
| EVAL-ADUSB2EBUZ | BOARD EVAL USBI |
| EVAL-ADV7195EB | BOARD EVAL FOR ADV7195 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| EVAL-ADUM3481EBZ | 制造商:Analog Devices 功能描述:EVALUATION BOARD DIGITAL ISOLATOR - Boxed Product (Development Kits) |
| EVAL-ADUM4070EBZ | 功能描述:界面开发工具 RoHS:否 制造商:Bourns 产品:Evaluation Boards 类型:RS-485 工具用于评估:ADM3485E 接口类型:RS-485 工作电源电压:3.3 V |
| EVAL-ADUM4160EBZ | 功能描述:EVALUATION MODULE FOR ADUM4160 RoHS:是 类别:编程器，开发系统 >> 评估演示板和套件 系列:iCoupler® 标准包装:1 系列:- 主要目的:电信，线路接口单元（LIU） 嵌入式:- 已用 IC / 零件:IDT82V2081 主要属性:T1/J1/E1 LIU 次要属性:- 已供物品:板，电源，线缆，CD 其它名称:82EBV2081 |
| EVAL-ADUM4160EBZ RENT | 制造商:Analog Devices 功能描述:BOARD EVAL DIGITAL ISOLATOR |
| EVAL-ADUM4223AEBZ | 功能描述:BOARD EVAL FOR ADUM4223 RoHS:是 类别:编程器，开发系统 >> 评估演示板和套件 系列:iCoupler® 标准包装:1 系列:- 主要目的:数字电位器 嵌入式:- 已用 IC / 零件:AD5258 主要属性:- 次要属性:- 已供物品:板 相关产品:AD5258BRMZ1-ND - IC POT DGTL I2C1K 64P 10MSOPAD5258BRMZ10-ND - IC POT DGTL I2C 10K 64P 10MSOPAD5258BRMZ100-ND - IC POT DGTL I2C 100K 64P 10MSOPAD5258BRMZ50-ND - IC POT DGTL I2C 50K 64P 10MSOPAD5258BRMZ1-R7-ND - IC POT DGTL I2C 1K 64P 10MSOPAD5258BRMZ10-R7-ND - IC POT DGTL I2C 10K 64P 10MSOPAD5258BRMZ50-R7-ND - IC POT DGTL I2C 50K 64P 10MSOPAD5258BRMZ100-R7-ND - IC POT DGTL I2C 100K 64P 10MSOP |
发布紧急采购，3分钟左右您将得到回复。