30.0
VP 5
25.0
®
Watts
yback)
quency
20.0
VP 4
15.0
10.0
5.0
VP 3
VP 2
VERSA-PAC
®
Inductors and Transformers
(Surface Mount)
400
500
VP 1
VERSA-PAC
®
Performance Characteristics
0.0
100
Frequency, kHz
Bipolar (Push-Pull) Power vs Frequency
200
300
Unipolar (Flyback) Power vs Frequency
40.0
35.0
30.0
70.0
60.0
50.0
40.0
VP 5
VP 5
Watts
Watts
h-Pull)
quency
30.0
Unipolar (Flyback)
Power vs Frequency
25.0
20.0
VP 4
15.0
10.0
VP 4
20.0
VP 3
VP 2
VP 3
10.0
0.0
100
5.0
VP 2
VP 1
200
300
400
500
0.0
100
VP 1
200
300
400
500
Frequency, kHz
10000
+V
Frequency, kHz
70.0
These curves represent typical power handling capability.
+V
VERSA-PAC
Indicated power levels may not be achievable with all configurations.
VP5-0083
VERSA-PAC
VP5-0083
1,2
60.0
50.0
RTN
+5V@
1A
IC
3.3V Buck Converter
RTN
Synchronous
Controller
IC
Synchronous
5V to 3.3V Buck
Controller
Converter With 5V Output
7
6
1,2
+5V@
1A
m Turns
Gauge
This circuit utilizes the gap of the VP5-0083 to handle the 12.5
This circuit minimizes both board space and cost by eliminating a
40.0
Bipolar (Push-Pull)
second regulator.
VERSA-PAC’s
gap
VP 5
+
to prevent core
Amp output current without saturating. In each of the five
VERSA-
serves
+
1000
PAC
sizes, the gap is varied to achieve a selection of specific
Power vs Frequency
saturation during the switch on-time and also stores energy for the
30.0
inductance and current values (see
VERSA-PAC
Data Table).
+5V load which is delivered during the
VP 4
flyback interval. The +3.3V
Size 5
buck winding is configured by placing two windings in series while
+3.3V@
+
All six windings are connected in
Size 4
to minimize AC/DC
parallel
20.0
4.2A
the +5V is generated by an additional
VP 3
flyback winding stacked on
+3.3V@
+
copper losses and to maximize heat
3
dissipation. With
VERSA-
4.2A
the 3.3V output. Extra windings are paralleled with primary
Size
10.0
PAC,
this circuit works well at or above 300 KHz. Also, the closed
windings to handle more current. The
VP 2
ratio of 2:1 adds 1.67V
turns
flux-path EFD geometry enables much lower radiation
VP 1
to the +3.3V during the flyback interval to achieve +5V.
Size 2
100
0.0
characteristics than open-path bobbin core style components.
200
300
400
500
100
12,11
3,4,5
12,11
3,4,5
7
Watts
6
LEVEL SHIFT
10,9,8
Maximum Turns
LEVEL SHIFT
10,9,8
+V
+V
1
2
3
4
5
6
+V
VERSA-PAC
Frequency, kHz
VP5-0083
12
11
1,2
10
9
8
7
12,11
3,4,5
Size 1
1
2
3
4
5
6
12
11
10
9
8
7
10000
VERSA-PAC
VP5-0083
+3.3V@
12.5A
+
RTN
Synchronous
Controller
IC
VERSA-PAC
VP5-0083
7
Synchronous
Controller
IC
Synchronous
Controller
IC
+5V@
1A
6
+
+3.3V@
12.5A
+
10
RTN
RTN
LEVEL SHIFT
10,9,8
1000
+
+3.3V@
4.2A
1
27 28
LITHIUM-ION BATTERY TO 3.3V SEPIC CONVERTER
29
30
31
32
33
34 35
VERSA-PAC
Maximum Turns
36 37 38 39 40
Wire Gauge
vs American
41 42
Maximum Turns
Size 5
Size 4
VERSA-PAC
Size
VP5-0083
12 11 10
4 5 6
12
11
10
9
9 8 7
8
7
Size 1
3
VP5-0083
The voltage of a
American Wire
10 4 5 6
varies above and below
Lithium-Ion Battery
Gauge
12 11
+3.3V depending on the degree of charge. The SEPIC
+
+3.3V@
configuration takes advantage of
VERSA-PAC’s
multiple tightly
6A
+
coupled windings. This results
9 8
lower ripple current which lowers
in
7
1 2 3
noise and core losses substantially. The circuit does not require a
+
snubber to control the voltage “spike” associated with switch turn-
off, and is quite efficient due to lower RMS current in the windings.
Controller
IC
W/Integral
Switch
+V
100
Controller
+
IC
Synchronous
W/Integral
Controller
Switch
IC
1
2
3
4
1 2 3
5
6
+
Size 2
+
VERSA-PAC
VP5-0083
+3.3V@
6A
+3.3V@
12.5A
+
RTN
10
PM-4301 8/06
© Cooper Electronic
Technologies 2006
Visit us on the Web at www.cooperbussmann.com
1225 Broken Sound Pkwy. Suite F Boca Raton, FL 33487
Tel: +1-561-998-4100 Toll Free: +1-888-414-2645 Fax: +1-561-241-6640
1
VERSA-PAC
VP5-0083
12 11 10
4 5 6
This bulletin is intended to present product design solutions and technical information that will help the end user with design applications. Cooper Electronic
27 28 29 30 31 32 33 34 35 36 37
+
38
+3.3V@
40 41 42
39
Technologies reserves the right, without notice, to change design or construction of any products and to discontinue or limit distribution of any
6A
products. Cooper
Controller
+
IC
Electronic Technologies also reserves the right to change or update, without notice, any technical information
American
3
Wire Gauge
Once a product has been
contained in
9
this
7
bulletin.
W/Integral
1 2
8
Switch
selected, it should be tested by the user in all possible applications.
+
Life Support Policy: Cooper Electronic Technologies does not authorize the use of any of its products for use in life support devices or systems without the
express written approval of an officer of the Company. Life support systems are devices which support or sustain life, and whose failure to perform, when
properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in significant injury to the user.
COOPER [ COOPER BUSSMANN, INC. ]
