ETALDOC 755/5

Page 1 of 4

January 2001

PRODUCT DATA SHEET

ADSL Transformer

P3902

Features

Applications

∗

  Low Cost

∗

  Texas Instruments CO and CPE

∗

  Low Distortion

∗

  ADSL over POTS

∗

  IEC 950, UL 1950 and EN 60950 Certified

∗

  UL Recognized Component

∗

  BABT Certified

∗

  Supplementary Insulation

∗

  Surface Mount

∗

  Industry Standard Footprint

 

 
 

DESCRIPTION

P3902 is designed for Central Office and Customer
Premises ADSL over POTS applications  using
TI TNETD3000, and Central Office ADSL over
POTS applications using TI TNETD4000.

P3902 is certified to standards IEC 950, EN 60950
and UL 1950 for supplementary insulation, 250V
working voltage. P3902 is a UL Recognized
Component and is supported by an IEC CB Test
Certificate and BABT Certificate.

The safety system yields very low transformer
parasitics, ensuring that P3902 exhibits excellent
frequency response and balance; in combination
with its good harmonic distortion performance,
P3902 is ideally suited to low cost yet demanding
ADSL applications.

E203175

to Electronic Techniques

(Anglia) Limited

P3902

ETALDOC 755/5

Page 2 of 4

January 2001

SPECIFICATIONS

Electrical

Typical values at T = 25ºC, unless otherwise stated.

Parameter

Conditions

Min

Typ

Max

Units

Inductance

10kHz 100mV
1-4

1.42

1.50

1.58

mH

Leakage inductance

100kHz, 100mV
Pins 1-4 (link 7-10)

-

-

15

µH

Interwinding
capacitance

100kHz 100mV
1-10

-

20

30

pF

DC resistance

1-4
7-10

-
-

-
-

1.6
0.7

Ù
Ù

Turns ratio

1-4 : 10-7

1.93

1.95

1.97

-

Voltage isolation 

(1)

50Hz
DC
(1,4 : 7,10)

2.12

3.0

-
-

-
-

kVrms

kV

Operating range:
Functional
Storage

Ambient temperature

-40
-40

-
-

+85
+85

ºC
ºC

 

Notes

1.  Components are 100% tested at 3.25kV DC.

P3902

ETALDOC 755/5

Page 3 of 4

January 2001

CONSTRUCTION

Dimensions shown are in millimetres (inches).

SAFETY

ABSOLUTE MAXIMUM RATINGS

(Ratings of components independent of circuit).

Short term isolation voltage (1s)

2.12kVrms,
3.0kVDC

Storage temperature

-40ºC to
+85ºC

Constructed in accordance with IEC 950:1991,
supplementary insulation, 250V maximum working
voltage, flammability class V-0.

Installation requirements should be observed
whereby a minimum of 1.0mm  creepage and
1.5mm clearance is maintained between the ferrite
core and accessible conductive parts in the host
equipment.

Reflow temperature (10s)

260ºC

0.80
(0.032)

0

.7

0

(0

.0

2

8

)

15.40

(0.606)

2

,5

0

(0

.0

9

8

)

Connections

Fig. 2

1.95 : 1

17.15 max

(0.67)

1

2.

9

 m

a

x

(0

.5

1)

12

.2

 m

a

x

(0

.4

8

)

13.0
(0.51)

0

.7

(0

.0

3

)

2,

5

(0

.1

0

)

CHAMFER
ON BOBBIN

Dimensions

Fig. 1

N

C

/0

00

0

70

P3902

ETALDOC 755/5

Page 4 of 4

January 2001

CERTIFICATION

COPYRIGHT

Certified by BSI to IEC 950:1991/A4:1996 (IEC CB
Test Certificate No.  GB518W) sub-clauses 1.5,
1.5.1, 1.5.3, 2.2, 2.2.2, 2.2.3, 2.2.4, 2.9.2, 2.9.3,
2.9.4, 4.4, 4.4.3.2 (class V-0) and 5.3 for a
maximum working voltage of 250Vrms, nominal
mains supply voltage not exceeding 300Vrms and
a maximum operating temperature of +85ºC in
Pollution Degree 2 environments, supplementary
insulation, clearance greater than 2.0mm,
creepage greater than 2.5mm, distance through
solid insulation greater than 0.4mm.

Recognized under the Component Recognition
Program of Underwriters Laboratories Inc. to US and
Canadian requirements CAN/CSA C22.2
No. 950-95/UL1950, Third Edition, including revisions
through to revision date March 1, 1998, based on
Fourth Amendment of IEC 950, Second Edition,
maximum working voltage 250Vrms, Pollution Degree
2, supplementary insulation.

UL File number E203175.
Certified by BABT to EN 60950.
BABT Certificate NC/000070.

Additionally, Profec Technologies certifies all
transformers as providing voltage isolation of
2.12kVrms, 3kV DC minimum.   All shipments are
supported by a Certificate of Conformity to current
applicable safety standards.

ETAL and P3902 are  Trade Marks of Profec
Technologies Ltd.
The  Trade Mark ETAL is registered at the UK
Trade Marks Registry.

Profec Technologies Ltd. is the owner of the
design right under the Copyright Designs and
Patents Act 1988 and no rights or licences are
hereby granted or implied to any third party.

© 2000 Profec Technologies Ltd.
Reproduction prohibited.

T R A N S F O R M I N G    T H E         F U T U R E

Profec Technologies Ltd., 10 Betts Avenue, Martlesham Heath, Ipswich, IP5 3RH, England

                           Telephone: +44 (0) 1473 611422

Fax:  +44 (0) 1473 611919

Websites: www.etal.ltd.uk

www.profec.com

Email:

info@etal.ltd.uk

sales@profec.com

ISO 9001

FM 25326