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78253/55V PDF预览

78253/55V

更新时间： 2024-11-06 23:13:31
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MAX253 Compatible Converter Transformers

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78253/55V 数据手册

 浏览型号78253/55V的Datasheet PDF文件第2页 
78253 SERIES  
MAX253 Compatible Converter Transformers  
SELECTION GUIDE  
Input  
Voltage  
Output  
Voltage  
Output  
Current  
Isolation  
Voltage  
Turns  
Ratio  
Package  
Style  
Order Code  
78253/35  
78253/35M  
78253/55  
78253/55M  
78253/35V  
78253/35MV  
78253/55V  
78253/55MV  
(V)  
(V)  
(mA Max)  
(VDC)  
DIP  
SM  
DIP  
SM  
DIP  
SM  
DIP  
SM  
3.3  
5.0  
3.3  
5.0  
5.0  
100  
1500  
1:Ö5  
1:1.31  
1:Ö5  
5.0  
5.0  
5.0  
200  
100  
200  
1500  
4000  
4000  
1:1.36  
FEATURES  
78253/35(M) CHARACTERISTICS  
■ 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  
Parameter  
Conditions  
MIN  
0.30  
1.60  
TYP  
MAX Units  
Primary Inductance, LP  
Secondary Inductance, LS  
Leakage Inductance, LL  
Interwinding Capacitance, CWW  
D.C. Resistance, RDC  
Volt-time Product, ET  
100kHz, 250mV  
0.38 0.46  
2.00 2.40  
0.30 1.00  
mH  
mH  
µH  
pF  
100kHz, 250mV  
100kHz, 250mV  
100kHz, 250mV  
>0.1VDC  
30  
50  
0.40 1.00  
80  
W
5kHz, 5V  
50  
Vµs  
78253/55(M) CHARACTERISTICS  
Parameter  
Conditions  
MIN  
0.60  
1.10  
TYP  
MAX Units  
■ Surface Mount Available  
Primary Inductance, LP  
Secondary Inductance, LS  
Leakage Inductance, LL  
Interwinding Capacitance, CWW  
D.C. Resistance, RDC  
Volt-time Product, ET  
100kHz, 250mV  
100kHz, 250mV  
100kHz, 250mV  
100kHz, 250mV  
>0.1VDC  
0.83 1.10  
1.40 1.70  
0.35 1.00  
mH  
mH  
µH  
pF  
DESCRIPTION  
30  
50  
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.  
0.70 1.50  
65  
W
5kHz, 5V  
50  
Vµs  
78253/35(M)V CHARACTERISTICS  
Parameter  
Conditions  
MIN  
110  
550  
TYP  
142  
710  
3.00 5.00  
4.20 8.00  
0.30 0.50  
42  
MAX Units  
Primary Inductance, LP  
Secondary Inductance, LS  
Leakage Inductance, LL  
Interwinding Capacitance, CWW  
D.C. Resistance, RDC  
Volt-time Product, ET  
100kHz, 20mV  
100kHz, 20mV  
100kHz, 250mV  
100kHz, 250mV  
>0.1VDC  
185  
850  
µH  
µH  
µH  
pF  
W
5kHz, 5V  
30  
Vµs  
78253/55(M)V CHARACTERISTICS  
Parameter  
Conditions  
MIN  
190  
350  
TYP  
240  
444  
5.20 8.00  
4.20 8.00  
0.40 0.60  
32  
MAX Units  
Primary Inductance, LP  
Secondary Inductance, LS  
Leakage Inductance, LL  
Interwinding Capacitance, CWW  
D.C. Resistance, RDC  
Volt-time Product, ET  
100kHz, 20mV  
100kHz, 20mV  
100kHz, 250mV  
100kHz, 250mV  
>0.1VDC  
310  
540  
µH  
µH  
µH  
pF  
W
5kHz, 5V  
25  
Vµs  
ABSOLUTE MAXIMUM RATINGS  
Operating free air temperature range  
Storage temperature range  
Lead Temperature 1.5mm from case for 10 seconds  
Peak current IPK  
–40°C to 85°C  
–50°C to 125°C  
300°C  
400mA  
Isolation voltage 78253/XX(M) (flash tested for 1 second)  
Isolation voltage 78253/XX(M)V (flash tested for 1 second)  
1500VDC  
4000VDC  
www.dc-dc.com  
All specifications typical at TA=25°C.  
12

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