5 05/16
Please read Cautions and warnings and
Important notes at the end of this document.
With:
B
max
Maximum magnetic flux density in the ferrite core of the current sense transformer
V
sense,max
Maximum output voltage of the measurement signal
G
max
Maximum duty cycle
n
s
Number of turns of the secondary winding of the current sense transformer
A
e
Effective magnetic area of the ferrite core
f
osc
Operating frequency of the switching operator IC
Typical value for A
e
: 1.44 x 10
-6
m
2
Typical B
max
: 200 mT
With:
R
T
Resistance of burden resistor
V
sense,max
Maximum output voltage of the measurement signal
n
s
Number of turns on the secondary side of the CT
I
prim,max
Maximum primary current (peak current)
Characteristics and ordering codes
L
min
PH
Turns ratio
N
p
: N
s
DC resistance
R
max
(m:)
Voltage-
time product
Recomm.
R
T
Ordering code
primary secondary V
µs
33 1 : 20 2.5 320 5.76 20 B82801A0333A020
74 1 : 30 2.5 800 8.6 30 B82801A0743A030
132 1 : 40 2.5 1300 11.5 40 B82801A0134A040
205 1 : 50 2.5 2200 14.4 50 B82801A0214A050
295 1 : 60 2.5 3600 17.3 60 B82801A0304A060
400 1 : 70 2.5 4600 20.0 70 B82801A0404A070
820 1 : 100 2.5 8700 28.8 100 B82801A0824A100
1280 1 : 125 2.5 13000 36.0 125 B82801A0135A125
1840 1 : 150 2.5 21000 43.2 150 B82801A0185A150
B
max
V
sense max
G
max
n
s
A
e
f
osc
-----------------------------------------
=
R
T
V
sense max
n
s
I
prim max
-----------------------------------
=
B82801ASMT current sense transformers
EE 4.2
