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ADUM5202CRWZ

更新时间: 2024-10-28 06:36:27
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亚德诺 - ADI 转换器驱动程序和接口接口集成电路光电二极管
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24页 544K
描述
Dual Channel Isolators with Integrated DC-to-DC Converter

ADUM5202CRWZ 数据手册

 浏览型号ADUM5202CRWZ的Datasheet PDF文件第16页浏览型号ADUM5202CRWZ的Datasheet PDF文件第17页浏览型号ADUM5202CRWZ的Datasheet PDF文件第18页浏览型号ADUM5202CRWZ的Datasheet PDF文件第20页浏览型号ADUM5202CRWZ的Datasheet PDF文件第21页浏览型号ADUM5202CRWZ的Datasheet PDF文件第22页 
ADuM5200/ADuM5201/ADuM5202  
50% of the 0.5 V margin at the decoder, a maximum allowable  
magnetic field is calculated as shown in Figure 23.  
PROPAGATION DELAY PARAMETERS  
Propagation delay is a parameter that describes the time it takes a  
logic signal to propagate through a component. The propagation  
delay to a logic low output may differ from the propagation delay  
to a logic high.  
100  
10  
1
INPUT (V  
)
50%  
IX  
tPLH  
tPHL  
OUTPUT (V  
)
50%  
OX  
0.1  
Figure 22. Propagation Delay Parameters  
0.01  
Pulse width distortion is the maximum difference between these  
two propagation delay values and is an indication of how  
accurately timing of the input signal is preserved.  
0.001  
1k  
10k  
100k  
1M  
10M  
100M  
Channel-to-channel matching refers to the maximum amount  
the propagation delay differs between channels within a single  
ADuM520x component.  
MAGNETIC FIELD FREQUENCY (Hz)  
Figure 23. Maximum Allowable External Magnetic Flux Density  
For example, at a magnetic field frequency of 1 MHz, the  
maximum allowable magnetic field of 0.2 kgauss induces a  
voltage of 0.25 V at the receiving coil. This is about 50% of the  
sensing threshold and does not cause a faulty output transition.  
Similarly, if such an event occurs during a transmitted pulse  
(and is of the worst-case polarity), it reduces the received pulse  
from >1.0 V to 0.75 V—still well above the 0.5 V sensing  
threshold of the decoder.  
Propagation delay skew refers to the maximum amount the  
propagation delay differs between multiple ADuM520x  
components operating under the same conditions.  
DC CORRECTNESS AND MAGNETIC FIELD IMMUNITY  
Positive and negative logic transitions at the isolator input  
cause narrow (~1 ns) pulses to be sent to the decoder via the  
transformer. The decoder is bistable and is, therefore, either set  
or reset by the pulses, indicating input logic transitions. In the  
absence of logic transitions at the input for more than 1 μs, a  
periodic set of refresh pulses indicative of the correct input state  
are sent to ensure dc correctness at the output. If the decoder  
receives no internal pulses of more than about 5 μs, the input  
side is assumed to be unpowered or nonfunctional, in which case  
the isolator output is forced to a default state (see Table 13) by  
the watchdog timer circuit.  
The preceding magnetic flux density values correspond to  
specific current magnitudes at given distances from the  
ADuM520x transformers. Figure 24 expresses these allowable  
current magnitudes as a function of frequency for selected  
distances. As shown, the ADuM520x is extremely immune and  
can be affected only by extremely large currents operated at  
high frequency very close to the component. For the 1 MHz  
example noted, a 0.5 kA current placed 5 mm away from the  
ADuM520x is required to affect the operation of the  
component.  
The limitation on the magnetic field immunity of the ADuM520x  
is set by the condition in which induced voltage in the receiving  
coil of the transformer is sufficiently large to either falsely set or  
reset the decoder. The following analysis defines the conditions  
under which this may occur. The 3 V operating condition of the  
ADuM520x is examined because it represents the most suscept-  
ible mode of operation.  
1000  
DISTANCE = 1m  
100  
10  
The pulses at the transformer output have an amplitude greater  
than 1.0 V. The decoder has a sensing threshold at about 0.5 V, thus  
establishing a 0.5 V margin in which induced voltages can be  
tolerated. The voltage induced across the receiving coil is given by  
DISTANCE = 100mm  
1
DISTANCE = 5mm  
0.1  
2
V = (−dβ/dt)πrn ; n = 1, 2, … , N  
where:  
0.01  
1k  
10k  
100k  
1M  
10M  
100M  
β is the magnetic flux density (gauss).  
N is the number of turns in the receiving coil.  
rn is the radius of the nth turn in the receiving coil (cm).  
MAGNETIC FIELD FREQUENCY (Hz)  
Figure 24. Maximum Allowable Current  
for Various Current-to-ADuM520x Spacings  
Given the geometry of the receiving coil in the ADuM520x and  
an imposed requirement that the induced voltage be, at most,  
Note that at combinations of strong magnetic field and high  
frequency, any loops formed by PCB traces can induce error  
Rev. 0 | Page 19 of 24  
 
 
 

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