参数资料
型号: 78253
厂商: C
英文描述: MAX253 Compatible Converter Transformers
中文描述: MAX253兼容转换器变压器
文件页数: 1/2页
文件大小: 168K
代理商: 78253
FEATURES
I
Maxim Compatible
I
3.3V and 5V Versions
I
Isolation to 4kV
I
Frequency Range to 500kHz
I
Toroidal Construction
I
Industrial Standard Pinout
I
UL 94V-0 Package Material
I
Fully Encapsulated
I
Low Profile
I
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
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
Conditions
100kHz, 250mV
100kHz, 250mV
100kHz, 250mV
100kHz, 250mV
>0.1VDC
5kHz, 5V
MIN
0.30
1.60
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
Vμs
50
78253/55(M) CHARACTERISTICS
Parameter
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
Conditions
100kHz, 250mV
100kHz, 250mV
100kHz, 250mV
100kHz, 250mV
>0.1VDC
5kHz, 5V
MIN
0.60
1.10
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
Vμs
50
78253/35(M)V CHARACTERISTICS
Parameter
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
Conditions
100kHz, 20mV
100kHz, 20mV
100kHz, 250mV
100kHz, 250mV
>0.1VDC
5kHz, 5V
MIN
110
550
TYP
142
710
3.00
4.20
0.30
42
MAX
185
850
5.00
8.00
0.50
Units
μH
μH
μH
pF
Vμs
30
78253/55(M)V CHARACTERISTICS
Parameter
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
Conditions
100kHz, 20mV
100kHz, 20mV
100kHz, 250mV
100kHz, 250mV
>0.1VDC
5kHz, 5V
MIN
190
350
TYP
240
444
5.20
4.20
0.40
32
MAX
310
540
8.00
8.00
0.60
Units
μH
μH
μH
pF
Vμs
25
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)
–40°C to 85°C
–50°C to 125°C
300°C
400mA
1500VDC
4000VDC
ABSOLUTE MAXIMUM RATINGS
All specifications typical at T
A
= 2 5 C
SELECTION GUIDE
Input
Voltage
(V)
Output
Voltage
(V)
Output
Current
(mA Max)
Isolation
Voltage
(VDC)
Turns
Ratio
Package
Style
Order Code
78253/35
78253/35M
78253/55
78253/55M
78253/35V
78253/35MV
78253/55V
78253/55MV
3.3
5.0
100
1500
1:
5
DIP
SM
DIP
SM
DIP
SM
DIP
SM
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
78253 SERIES
MAX253 Compatible Converter Transformers
www.dc-dc.com
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