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EE|Times EUROPE — Power Electronics 33
Miniature Current Transformers Keep Pace with GaN
A48E_EETimes_2_06x9_5.qxp_Layout 1 12/18/

1.2

1.0
Normalized Output 0.6 Transformers
0.8

& Inductors

0.4
0.2 SURFACE MOUNT
(and thru-hole)
0.0
100 Hz 1 kHz 10 kHz 100 kHz 1 MHz 10 MHz 100 MHz
Frequency

7492540100 (EE13) 749251100 (EE5) 749252100 (EE4.4)

Size Does Matter!
Figure 2: Chart showing how magnetizing inductance, winding self-capacitance, and core
size affect operating frequency range of a current transformer. Black = 7492540100-EE13; Low Profile
red = 749251100-EE5; gray = 749252100-EE4.4; all 1:100 turns ratio, 100-Ω burden, From .18” Height
normalized output voltage. 1.2 Grams Weight

Reliability:
MIL PRF27/MIL PRF21308
Manufacturing Approved DSCC
D1*
Quality:
AS9100C Qualified Facility
US Manufactured
IP IST Iex Is
Military and Commercial Aircraft
Im Ic Supplier for over 50 Years
NP NS RB For all your
LM RC TRANSFORMER &
INDUCTOR requirements
• Audio • Pulse
• DC-DC • MultiPlex
• Power & EMI

S20 111
Figure 3: Exciting current (I ), the vector sum of magnetizing current (I ) and core loss See Pico’s full Catalog immediately
ex
m
current (I ), diverts current away from the measurement current (I ). The effect happens on our NEW Website
s
c
on the primary side, but we cannot measure it there. The series diode prevents the reset www.picoelectronics.com
voltage from appearing at the output.
PICO Electronics, Inc.
143 Sparks Ave. Pelham, N.Y. 10803-1837
Pico Representatives

England
Actual current Solid State Supplies/Ginsbury
E-mail: russell.bennett@sssltd.com
Phone: 44 1634 298900
Sensed current with droop Actual current Fax: 44 1634 290904
Belgium/Luxemburg/France
Sensed current with droop Netherlands/Scandinavia
ELCOS/BVBA
E-mail: info@elcos.be
Phone: 32 3 218 20 73
www.elcos.be

Germany
ELBV/Electra Bauemente Vertrieb
Figure 4: Droop results from the voltage drop created by increasing exciting current E-mail: info@elbv.de
going through the winding resistance (V = I ). Phone: 49 089 460205442
Fax: 49 089 460205442
R
www.eetimes.eu | FEBRUARY 2021