CANDD 78253-55MV, 78253-55M, 78253-55, 78253-35V, 78253-35MV Datasheet
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78253 SERIES
MAX253 Compatible Converter Transformers
SELECTION GUIDE
Input Output Output Isolation Turns Package
Voltage Voltage Current Voltage Ratio
Order Code (V) (V) (mA Max) (VDC)
78253/35
78253/35M
78253/55
78253/55M
78253/35V
78253/35MV
78253/55V
78253/55MV
3.3 5.0 100 1500 1:√5
5.0 5.0 200 1500 1:1.31
3.3 5.0 100 4000 1:√5
5.0 5.0 200 4000 1:1.36
Style
DIP
SM
DIP
SM
DIP
SM
DIP
SM
FEATURES
■ Maxim Compatible
■ 3.3V and 5V Versions
■ Isolation to 4kV
■ Frequency Range to 500kHz
■ Toroidal Construction
■ Industrial Standard Pinout
■ UL 94V-0 Package Material
■ Fully Encapsulated
■ Low Profile
■ Surface Mount Available
DESCRIPTION
The 78253 series of converter transformers
are specifically designed for use with the
MAX253 chip set 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 bridge or voltage doubling.
The surface mount devices are fully
compatible with CECC00802 to 280°C
which allows them to be placed and reflowed
with IC’s thus reducing time and cost in
production.
78253/35(M) CHARACTERISTICS
Parameter Conditions MIN TYP MAX Units
Primary Inductance, L
Secondary Inductance, L
Leakage Inductance, L
P
S
L
Interwinding Capacitance, C
D.C. Resistance, R
Volt-time Product, E
DC
T
100kHz, 250mV 0.30 0.38 0.46 mH
100kHz, 250mV 1.60 2.00 2.40 mH
100kHz, 250mV 0.30 1.00 µH
100kHz, 250mV 30 50 pF
WW
>0.1VDC 0.40 1.00 Ω
5kHz, 5V 50 80 Vµs
78253/55(M) CHARACTERISTICS
Parameter Conditions MIN TYP MAX Units
Primary Inductance, L
Secondary Inductance, L
Leakage Inductance, L
P
S
L
Interwinding Capacitance, C
D.C. Resistance, R
Volt-time Product, E
DC
T
100kHz, 250mV 0.60 0.83 1.10 mH
100kHz, 250mV 1.10 1.40 1.70 mH
100kHz, 250mV 0.35 1.00 µH
100kHz, 250mV 30 50 pF
WW
>0.1VDC 0.70 1.50 Ω
5kHz, 5V 50 65 Vµs
78253/35(M)V CHARACTERISTICS
Parameter Conditions MIN TYP MAX Units
Primary Inductance, L
Secondary Inductance, L
Leakage Inductance, L
P
S
L
Interwinding Capacitance, C
D.C. Resistance, R
Volt-time Product, E
DC
T
100kHz, 20mV 110 142 185 µH
100kHz, 20mV 550 710 850 µH
100kHz, 250mV 3.00 5.00 µH
100kHz, 250mV 4.20 8.00 pF
WW
>0.1VDC 0.30 0.50 Ω
5kHz, 5V 30 42 Vµs
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78253/55(M)V CHARACTERISTICS
Parameter Conditions MIN TYP MAX Units
Primary Inductance, L
Secondary Inductance, L
Leakage Inductance, L
P
S
L
Interwinding Capacitance, C
D.C. Resistance, R
Volt-time Product, E
DC
T
100kHz, 20mV 190 240 310 µH
100kHz, 20mV 350 444 540 µH
100kHz, 250mV 5.20 8.00 µH
100kHz, 250mV 4.20 8.00 pF
WW
>0.1VDC 0.40 0.60 Ω
5kHz, 5V 25 32 Vµs
ABSOLUTE MAXIMUM RATINGS
Operating free air temperature range –40°C to 85°C
Storage temperature range –50°C to 125°C
Lead Temperature 1.5mm from case for 10 seconds 300°C
Peak current I
PK
Isolation voltage 78253/XX(M) (flash tested for 1 second) 1500VDC
Isolation voltage 78253/XX(M)V (flash tested for 1 second) 4000VDC
All specifications typical at TA= 2 5 ° C .
400mA
78253 SERIES
MAX253 Compatible Converter Transformers
MECHANICAL DIMENSIONS
6 Pin DIP 6 Pin SM
9.52 max
Top View
Primary Secondary
1
6
12.70
9.52 max Top View
Primary Secondary
1
6
8.89 max
2
5
8.89 max
78253
3
6.35
3.44±0.50
0.30
0.20
35
XYYWW
10.16 2.54
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)
10
100
80
60
40
20
78253/35(M)
8
6
4
2
0
0 20 40 60 80 100 120
0
0 20 40 60 80 100 120
1 1 0
105
100
FS=Low
9 5
9 0
-50 -25 0 25 50 75 100
FS=High
Output Current (mA)
78253/35(M)
FS=Low
Output Current (mA)
78253/35(M)
FS=High
Temperature (°C)
FS=Low
FS=High
10
100
80
60
40
20
78253/55(M)
8
6
4
2
0
0
1 1 0
105
100
FS=Low/High
0 100 200 300 400
Output Current (mA)
78253/55(M)
FS=Low/High
0 100 200 300 400
Output Current (mA)
78253/55(M)
FS=High
FS=Low
9 5
9 0
-50 -25 0 25 50 75 100
Temperature (°C)
4
6.35
0.30
0.20
0.63
0.53
VOLTAGE CURVES
10
8
6
4
2
0
0 20 40 60 80 100
EFFICIENCY CURVES
100
80
FS=High
60
40
20
0
0 20 40 60 80 100
VOLTAGE DEVIATION
1 1 0
105
100
9 5
9 0
-50 -25 0 25 50 75 100
78250M
XYYWW
0.90
78253/35(M)V
Output Current (mA)
78253/35(M)V
FS=Low
Output Current (mA)
78253/35(M)V
FS=High
FS=Low
Temperature (°C)
FS=High
FS=Low
2
3
2.54
10
100
80
60
40
20
78253/55(M)V
8
6
4
2
0
0 100 200 300 400
0
0 100 200 300 400
1 1 0
105
100
9 5
9 0
-50 -25 0 25 50 75 100
FS=High
Output Current (mA)
78253/55(M)V
FS=High
Output Current (mA)
78253/55(M)V
FS=Low
FS=High
Temperature (°C)
0.63
0.53
FS=Low
FS=Low
5
4
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 78253.2
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
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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
C&D Technologies (NCL), Inc.
8917 Glenwood Avenue, Raleigh
NC 27612, USA
Tel: +1 (919) 571-9405
Fax: +1 (919) 571-9262
email: info@us.cdtechno-ncl.com
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