78253 Datasheet, PDF (1/2 Pages) C&D Technologies – MAX253 Compatible Converter Transformers

78253 SERIES
MAX253 Compatible Converter Transformers
FEATURES
s Maxim Compatible
s 3.3V and 5V Versions
s Isolation to 4kV
s Frequency Range to 500kHz
s Toroidal Construction
s Industrial Standard Pinout
s UL 94V-0 Package Material
s Fully Encapsulated
s Low Profile
s 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.
SELECTION GUIDE
Order Code
78253/35
78253/35M
78253/55
78253/55M
78253/35V
78253/35MV
78253/55V
78253/55MV
Input
Voltage
(V)
3.3
5.0
3.3
5.0
Output
Voltage
(V)
5.0
Output
Current
(mA Max)
100
Isolation
Voltage
(VDC)
1500
5.0
200
1500
5.0
100
4000
5.0
200
4000
Turns
Ratio
1:√5
1:1.31
1:√5
1:1.36
Package
Style
DIP
SM
DIP
SM
DIP
SM
DIP
SM
78253/35(M) CHARACTERISTICS
Parameter
Conditions
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
MIN
0.30
1.60
50
TYP
0.38
2.00
0.30
30
0.40
80
MAX
0.46
2.40
1.00
50
1.00
Units
mH
mH
µH
pF
Ω
Vµs
78253/55(M) CHARACTERISTICS
Parameter
Conditions
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
MIN
0.60
1.10
50
TYP
0.83
1.40
0.35
30
0.70
65
MAX
1.10
1.70
1.00
50
1.50
Units
mH
mH
µH
pF
Ω
Vµs
78253/35(M)V CHARACTERISTICS
Parameter
Conditions
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, 20mV
100kHz, 20mV
100kHz, 250mV
100kHz, 250mV
>0.1VDC
5kHz, 5V
MIN TYP MAX Units
110 142 185 µH
550 710 850 µH
3.00 5.00 µH
4.20 8.00 pF
0.30 0.50 Ω
30 42
Vµs
78253/55(M)V CHARACTERISTICS
Parameter
Conditions
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, 20mV
100kHz, 20mV
100kHz, 250mV
100kHz, 250mV
>0.1VDC
5kHz, 5V
MIN TYP MAX Units
190 240 310 µH
350 444 540 µH
5.20 8.00 µH
4.20 8.00 pF
0.40 0.60 Ω
25 32
Vµs
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ABSOLUTE MAXIMUM RATINGS
Operating free air temperature range
Storage temperature range
Lead Temperature 1.5mm from case for 10 seconds
Peak current I_PK
Isolation voltage 78253/XX(M) (flash tested for 1 second)
Isolation voltage 78253/XX(M)V (flash tested for 1 second)
All specifications typical at TA=25°C.
–40°C to 85°C
–50°C to 125°C
300°C
400mA
1500VDC
4000VDC