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
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