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SLMA002 Datasheet(PDF) 32 Page - Texas Instruments

Part # SLMA002
Description  3-A DUAL NON-SYNCHRONOUS CONVERTER WITH INTEGRATED HIGH-SIDE MOSFET AND EXTERNAL COMPENSATION
PDF  46 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

SLMA002 Datasheet(HTML) 32 Page - Texas Instruments

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background image
(
)
(
)
1
1
RIPPLE
L1 peak
OUT1 max
2
2
I
I
I
3.0 A
0.661A
3.3 A
»
+
=
+
=
(32)
(
)
(
)
1
1
RIPPLE
L2 peak
OUT2 max
2
2
I
I
I
3.0 A
0.547 A
3.3 A
»
+
=
+
=
(33)
(
) (
)
(
)
(
)
IN max
BR R min
IN max
V
V
1.25
V
1.25 13.2 V
16.5 V
0.8
³
=
´
=
´
=
(34)
(
)
(
)
(
)
MIN1
D1 avg
OUT1 max
I
I
1 D
3.0 A
(1
0.397)
1.81A
»
´
-
=
´
-
=
(35)
(
)
(
)
(
)
MIN2
D2 avg
OUT2 max
I
I
1 D
3.0 A
(1
0.272)
2.18 A
»
´
-
=
´
-
=
(36)
(
)
(
)
D peak
L peak
I
I
=
(37)
(
)
(
)
FM
D1 max
D1 avg
P
V
I
0.4 V
1.81
0.72 W
»
´
»
´
=
(38)
D2(max)
FM
D2(avg)
P
V
I
0.4V
2.18
0.87W
»
´
»
´
=
(39)
(
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(
)
(
)
(
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(
)
2
2
TRAN MAX
OUT1 min
OUT1
OVER
I
L
1A
8.2 H
C
8.2 F
5.0 V
0.2 V
V
V
´
´
m
=
=
=
m
´
´
(40)
(
)
(
)
(
)
(
)
(
)
2
2
TRAN MAX
OUT2 min
OUT2
OVER
I
L
1A
8.2 H
C
12.4 F
3.3 V
0.2 V
V
V
´
´
m
=
=
=
m
´
´
(41)
TPS55383
,, TPS55386
SLUS818 – SEPTEMBER 2008 ......................................................................................................................................................................................... www.ti.com
A DC current with 30% peak to peak ripple has an RMS current approximately 0.4% above the average current.
The peak inductor current is estimated by:
An 8.2-
µH inductor with a minimum RMS current rating of 3.0 A and minimum saturation current rating of 3.3 A
must be selected. A Coilcraft MSS1048-822ML 8.2-
µH, 4.38-A inductor is chosen for both outputs.
Rectifier Diode Selection
A low forward voltage drop schottky diode is used as a rectifier diode to minimize power dissipation and
maximize efficiency.
Allowing 20% over VIN for ringing on the switch node, the rectifier diode’s minimum reverse break-down voltage
is given by:
Reviewing 20-V and 30-V schottky diodes, the MBRS330T3, 30-V, 3-A diodes in an SMC package are selected
for both channels. This diode has a forward voltage drop of 0.4 V at 3 A, so the conduction power dissipation is:
For this design, the maximum power dissipation is estimated as 0.72 W and 0.87 W respectively.
Output Capacitor Selection
Output capacitors are selected to support load transients and output ripple current. The minimum output
capacitance to meet the transient specification is given by:
32
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Copyright © 2008, Texas Instruments Incorporated
Product Folder Link(s): TPS55383 TPS55386



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