IR3721MPBF International Rectifier, IR3721MPBF Datasheet - Page 10

• Manufacturer Part Number: IR3721MPBF
• Description: Power Monitor IC with Analog Output
• Manufacturer: International Rectifier

Specifications of IR3721MPBF

• Package: 10 Lead 3x3 DFN
• Static Accuracy: 2.5% @ 65oC
• Vk Range: 0.5V - 1.8V
• Vcs Range: 5mV - 150mV
• Bias Supply Voltage: +3.3V +/-5%
• Junction Temperature: 0oC to 125oC
• Pbf: Yes

Choose a standard capacitor value larger than
indicated by the right hand side of the inequality
above.
Calculate the equivalent resistance R
We now have two equations, R
Req = (R
and R
Use the next higher standard 1% value than indicated
in the equations above. This will insure that full scale
current can be measured.
Bypass VCS to VO with capacitor C
this capacitor limits the bandwidth, but is required
because it is the integrator of the delta sigma
modulator. Consider selecting the value of C
place a filter corner frequency at 5 kHz, which will
reduce sampling ripple by 40 dB.
Page 10 of 16
CS2
R
CS1
using the following two equations.
CS1
R
· R
CS
C
=
R
2
CS
CS2
R
eq
=
SUM
1
R
= L / (DCR(25) ·C
) / (R
>
SUM
⋅
DCR
⎛
⎜
⎜
⎜
⎜
⎜ ⎜
⎝
CS1
1
⋅
+
⎛
⎜
⎜
⎜
⎜
⎜ ⎜
⎝
1
+ R
(
-
1
25
4
-
1
⋅
CS2
4
2
SUM
⋅ )
L
-
⋅
4
). Calculate R
2
R
R
R
⋅
= R
SUM
SUM
R
CS1
CS2
eq
R
SUM
eq
eq
CS1
)
. The value of
.
⎞
⎟
⎟
⎟
⎟
⎟ ⎟
⎠
and
⎞
⎟
⎟
⎟
⎟
⎟ ⎟
⎠
+ R
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CS2
CS2
CS1
to
and
DATA SHEET
IR3721
09/15/08