์ „์ž๋ถ€ํ’ˆ ๋ฐ์ดํ„ฐ์‹œํŠธ ๊ฒ€์ƒ‰์—”์ง„
  Korean  โ–ผ

Delete All
ON OFF
ALLDATASHEET.CO.KR

X  

Preview PDF Download HTML

AD8212 ๋ฐ์ดํ„ฐ์‹œํŠธ(HTML) 5 Page - Analog Devices

๋ถ€ํ’ˆ๋ช… AD8212
์ƒ์„ธ๋‚ด์šฉ  High Voltage Current Shunt Monitor
Download  8 Pages
Scroll/Zoom Zoom In 100% Zoom Out
์ œ์กฐ์‚ฌ  AD [Analog Devices]
ํ™ˆํŽ˜์ด์ง€  http://www.analog.com
Logo 

AD8212 ๋ฐ์ดํ„ฐ์‹œํŠธ(HTML) 5 Page - Analog Devices

   
Zoom Inzoom in Zoom Outzoom out
/ 8 page
 5 / 8 page
background image
Preliminary Technical Data
AD82122
Rev. PrA | Page 5 of 8
THEORY OF OPERATION
The AD8212 is a self-biased, high common mode current sense
amplifier.
LOAD
AD8212
IOUT
OFFSET
BIAS
VPLUS
IS
RS
+IN
โ€“IN
99kโ„ฆ
COM
ALPHA
RG1
Q1
ROUT
VOUT
Figure 3. Typical Connection Diagram
The current (IS) is drawn for the supply through the shunt
resistor (RS). This produces a small voltage (Vshunt) across the
inputs of the device, and in turn current flows across RG1 (1000
ฮฉ) into the collector of Q1. This current (IOUT) is converted
into a voltage through the use of an outside resistor (ROUT).
RG1 = 1000ฮฉ
Vshunt = (Is * Rs)
Iout = (Is * Rs) / (RG1)
Vout = (Is * Rs * Rout) / RG1
Table 3 lists the Rout values and the resulting gain for the
AD8212.
Table 3.
Rout (ฮฉ)
Gain (V/V)
1k
1
2k
2
5k
5
10k
10
20k
20
50k
50
100k
100
With the device operating in the manner shown above the
common mode voltage range is 7V to 65V. The 7V is necessary
for the device to operate because of an internal regulator that
turns on at that voltage. This internal regulator allows the
AD8212 to be self biased, meaning that the AD8212 hangs from
the common mode voltage, and no additional supply is
necessary. This internal regulator also maintains 5 V at all times
between the Vplus and COM. Therefore, the device always sees
5 V across, no matter what the common mode voltage. The
AD8212 can operate with voltages of up to 500V with the use of
an external pass transistor.
LOAD
AD8212
IOUT
Q1
OFFSET
BIAS
VPLUS
IS
RS
+IN
โ€“IN
99kโ„ฆ
COM
ALPHA
RBIAS
ROUT
VOUT
Figure 4.
At these high voltages a proper Rbias (depended upon the
application) is necessary to regulate the device by pulling
enough current through it to keep it to keep it going.
Ibias = (Vsupply โ€“5V)/ Rbias
The current necessary must be at least 90uA and can be as
high as 1mA. The formula above can be used to easily
calculate the external Rbias to deliver the proper current.
The Offset pin can be tied to COM for bidirectional current
measurements. The Offset voltage can be calculated by:
Voffset = (5 * 10^-5) * Rout
Between Vplus and COM there is 5V. When Offset is tied to
Com we have a resistor divider of 1K and 99K and 5V.
Therefore the current flowing to the Q1 collector is
0.5V/1kฮฉ=(5*10^-5). This current multiplied with Rout
produces the offset voltage. A high voltage PNP transistor is
necessary for using the AD8212 at high voltages. The only
limitation on what Common Mode Voltage range, is the
breakdown voltage of the pass transistor.


Html Pages

1  2  3  4  5  6  7  8 


๋ฐ์ดํ„ฐ์‹œํŠธ Download




๋งํฌ URL



Privacy Policy
ALLDATASHEET.CO.KR
ALLDATASHEET ๊ฐ€ ๊ท€ํ•˜์— ๋„์›€์ด ๋˜์…จ๋‚˜์š”?  [ DONATE ]  

Alldatasheet๋Š”?   |   ๊ด‘๊ณ ๋ฌธ์˜    |   ์šด์˜์ž์—๊ฒŒ ์—ฐ๋ฝํ•˜๊ธฐ   |   ๊ฐœ์ธ์ •๋ณด์ทจ๊ธ‰๋ฐฉ์นจ   |   ์ฆ๊ฒจ์ฐพ๊ธฐ   |   ๋งํฌ๊ตํ™˜   |   ์ œ์กฐ์‚ฌ๋ณ„ ๊ฒ€์ƒ‰
All Rights Reservedยฉ Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn