76250EN, 76253/XXEN
EN Approved Converter Transformers
SELECTION GUIDE
Input
Voltage
Output
Voltage
Output
Current
Isolation
Voltage
Turns
Ratio
Order Code
76250EN
76253/35EN
76253/55EN
(V)
–
3.3
5.0
(V)
–
5.0
5.0
(mA Max)
–
100
200
(VDC)
6000
6000
6000
1CT:1
1:√5
1:1.33
76250EN CHARACTERISTICS
Parameter
Conditions
MIN
TYP
MAX
Units
FEATURES
s
Maxim Compatible
s
BS EN 60950 Approved
s
Isolation to 6kV
s
Toroidal Construction
s
Industry Standard Pinout
s
UL 94V-0 Package Material
s
Fully Encapsulated
DESCRIPTION
The 76250EN converter transformer is
specifically designed for use with Maxim
chipsets to provide isolated RS232 interfaces.
A carefully controlled turns ratio ensures
consistent performance whilst a toroidal
construction minimises EMI.
The 76253/XXEN converter transformers
are specifically designed for use with the
MAX253 chipset to provide isolated power
supplies. The 5V version can supply 1W
and the 3.3V version can supply 500mW.
A centre tapped secondary winding allows
for full bridge, half bride or voltage doubling.
The devices are fully approved to BS EN
60950 for use in telecoms applications.
Primary Inductance, L
P
Leakage Inductance, L
L
Interwinding Capacitance, C
WW
D.C. Resistance, R
DC
Volt-time Product, E
T
10kHz, 100mV
100kHz, 100mV
100kHz, 100mV
<0.1VDC
5kHz, 5V
1.0
2.0
35
5.0
1.0
2.5
40
10
2.0
mH
µH
pF
Ω
Vµs
50
76253/35EN CHARACTERISTICS
Parameter
Conditions
MIN
TYP
MAX
Units
Primary Inductance, L
P
Secondary Inductance, L
S
Leakage Inductance, L
L
Interwinding Capacitance, C
WW
D.C. Resistance, R
DC
Volt-time Product, E
T
100kHz, 250mV
100kHz, 250mV
100kHz, 250mV
100kHz, 250mV
>0.1VDC
5kHz, 5V
53
350
92
460
1.5
1.80
0.60
120
600
3.6
3.00
1.00
µH
µH
µH
pF
Ω
Vµs
20
35
76253/55EN CHARACTERISTICS
Parameter
Conditions
MIN
TYP
MAX
Units
Primary Inductance, L
P
Secondary Inductance, L
S
Leakage Inductance, L
L
Interwinding Capacitance, C
WW
D.C. Resistance, R
DC
Volt-time Product, E
T
100kHz, 250mV
100kHz, 250mV
100kHz, 250mV
100kHz, 250mV
>0.1VDC
5kHz, 5V
120
280
205
362
3.90
1.20
0.90
250
445
5.00
3.00
1.50
µH
µH
µH
pF
Ω
Vµs
20
23
ABSOLUTE MAXIMUM RATINGS
Operating free air temperature range 76250EN
Operating free air temperature range 76253/XXEN
Storage temperature range
Lead Temperature 1.5mm from case for 10 seconds
Peak current I
PK
76250EN
Peak current I
PK
76253/XXEN
Isolation voltage (flash tested for 1 second)
All specifications typical at T
A
=25°C.
0°C to 70°C
–40°C to 85°C
–50°C to 125°C
300°C
300mA
400mA
6000VDC
www.dc-dc.com
76250EN, 76253/XXEN
EN Approved Converter Transformers
MECHANICAL DIMENSIONS
15.00
2.54
1
15.00
3
5
2
4*
12.50
12.00
76250EN
YYWW
6
4.10
0.56ø ±0.05
7.50
10.16
2.42
Pin Connections 76250EN (Top View)
Primary
1
3
5
6
Secondary
2
1
3
5
Pin Connections 76253/XXEN (Top View)
Primary
Secondary
2
4
6
* 76250EN Pin not fitted.
All dimensions in mm XX.XX ±0.25mm. All pins on a 2.54mm pitch and within ±0.25mm of true position.
TYPICAL CHARACTERISTICS
VOLTAGE CURVES
76253/35EN
10
8
6
4
FS=High
2
0
20
0
95
EFFICIENCY CURVES
76253/35EN
100
80
FS=High
60
FS=Low
40
100
110
VOLTAGE DEVIATION
76253/35EN
105
FS=Low
FS=High
FS=Low
90
0
20
40
60
80
Output Current (mA)
100
0
20
40
60
80
Output Current (mA)
100
-50
-25
0
25 50 75
Temperature (°C)
100
76253/55EN
10
8
6
4
2
0
0
100
200
300
Output Current (mA)
400
FS=Low/High
100
76253/55EN
110
76253/55EN
FS=High
80
FS=Low
60
100
105
FS=High
40
20
0
0
100
200
300
Output Current (mA)
400
95
FS=Low
90
-50
-25
0
25 50 75
Temperature (°C)
100
C&D Technologies (NCL) Limited reserve the right to alter or improve the
specification, internal design or manufacturing process at any time, without
notice. Please check with your supplier or visit our web site to ensure that
you have the current and complete specification for your product before use.
© C&D Technologies (NCL) Limited 2000
NMP 7625XEN.2
No part of this publication may be copied, transmitted or stored in a
retrieval system or reproduced in any way including, but not limited to,
photography, photocopy, magnetic or other recording means, without prior
written permission from C&D Technologies (NCL) Limited.
Instructions for use are available from www.dc-dc.com
C&D Technologies (NCL) Ltd
Tanners Drive, Blakelands North
Milton Keynes MK14 5BU, England
Tel: +44 (0)1908 615232
Fax:+44 (0)1908 617545
email: info@cdtechno-ncl.com
www: http://www.dc-dc.com
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