TransformingMagnetics
TM
SwitchmodePower
Push-Pull Transformers
View A
View B
Features
• Design verified with Linear Tech IC LT1533
• Economical, reliable surface mount transformers
and inductors
• Core geometry provides shielding for low
switching noise
• Manufactured with UL94V-O materials
• Designed for pick and place applications
• Compatible with solder reflow process to 240°C
Applications
• Ideal for use in DC/DC converter, push-pull
applications
• DC/DC converters for personal, industrial or test
equipment
• Coupled inductors may also be used as flyback
transformers and power inductors
• Low-power isolated power supplies
Mounting Pattern
Mounting Pattern
Environmental Specifications
• Operating temperature range:
-40°C to +85°C
• Storage temperature range:
-50°C to +125°C
Basic application drawing
Packaging
• Parts are packaged in 24/32 mm embossed
carrier tape per EIA-481-3
• Most parts are 400 pieces per 13" reel; 30812R
is 200 parts per 13" reel
v
I N
5
5
5
12
V
OUT
+ / - 12
+ / - 15
+/- 5
+/- 5
I
OUTrm s
mA
150
120
350
900
T
1
30802R
30804R
30807R
30812R
L
1
30942R
30942R
30944R
30945R
3
1
4
2
5
T
1
: Transformer specifications
L
MIN1
Part Num ber
30802R
30804R
30807R
30812R
1
TURNS
PRI :SEC
1: 4. 0
1: 5. 0
1: 1. 8
1: 0. 65
PRI
0. 275
0. 310
0. 250
0. 600
SEC
2. 700
6. 000
1. 150
0. 500
Vi ew
A
A
A
B
Schem ati c
1
1
1
2
1
6
uH
230
300
300
600
2
1
10
2
3
9
8
Inductance (L) is measured at 10KHz, 100mVAC.
4
7
L
1
: Coupled inductor specifications
Part Num ber
30942R
30943R
30944R
30945R
1
2
3
3
DCR
2
1. 000
2. 500
0. 3600
0. 210
Vi ew
A
A
A
A
Schem ati c
3
3
3
3
L
uH
1
Turns rati o
1: 1
1: 1
1: 1
1: 1
I
pk
mA
250
200
600
1500
500
800
100
33
4
1
6
Inductance (L) is measured at 100KHz, 100mV. Tolerance is + 10%.
DCR is expressed in maximum ohms for each winding.
2/12/04
tails subject to change. Contact your Midcom sales representative for additional information. Dimensions: in/mm. All tolerances are ± .010/0,25 and electrical specifications are @ 25°C unless otherwise specified.
Midcom, Inc. USA
40
121 Airport Drive - PO Box 1330
Watertown, SD 57201
T: 605.886.4385 ~ F: 605.886.4486
www.midcom-inc.com ~ email:sales@midcom-inc.com
Midcom, Inc. China
10/F Spectrum Tower 53 Hung to Road
Kwun Tong, Kowloon, HK
T: 852.2320.4221 ~ F: 852.2352.3272
www.midcom.com.cn ~ email:sye@midcom-inc.com
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