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SLMA002 Datasheet(PDF) 34 Page - Texas Instruments

Part # SLMA002
Description  2-A DUAL NON-SYNCHRONOUS CONVERTER WITH INTEGRATED HIGH-SIDE MOSFET
PDF  55 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

SLMA002 Datasheet(HTML) 34 Page - Texas Instruments

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Design Procedure
Duty Cycle Estimation
OUT
FD
max
IN(min)
FD
V
V
D
V
V
+
»
+
(21)
OUT
FD
min
IN(max)
FD
V
V
D
V
V
+
»
+
(22)
Inductor Selection
IN(m ax)
OUT
m in
m in
LRIP(m ax)
SW
V
V
1
L
D
I
f
-
»
´
´
(23)
IN(max)
OUT
RIPPLE
min
SW
V
V
1
I
D
L
f
-
»
´
´
(24)
(
)
(
)
(
)
2
2
L(avg)
RIPPLE
L rms
1
I
I
I
12
=
+
(25)
(
)
OUT(max)
RIPPLE
L peak
1
I
I
I
2
»
+
(26)
Rectifier Diode Selection
TPS54283,, TPS54286
SLUS749C – JULY 2007 – REVISED OCTOBER 2007
The first step is to estimate the duty cycle of each switching FET.
Using an assumed forward drop of 0.5 V for a schottky rectifier diode, the Channel 1 duty cycle is approximately
40.1% (minimum) to 48.7% (maximum) while the Channel 2 duty cycle is approximately 27.7% (minimum) to
32.2% (maximum).
The peak-to-peak ripple is limited to 30% of the maximum output current. This places the peak current far
enough from the minimum overcurrent trip level to ensure reliable operation.
For both Channel 1 and Channel 2, the maximum inductor ripple current is 600 mA. The inductor size is
estimated in Equation 23.
The inductor values are
• L1 = 18.3 µH
• L2 = 15.3 µH
The next higher standard inductor value of 22
µH is used for both inductors.
The resulting ripple currents are :
Peak-to-peak ripple currents of 0.498 A and 0.416 A are estimated for Channel 1 and Channel 2 respectively.
The RMS current through an inductor is approximated by Equation 25.
and is approximately 2.0 A for both channels.
The peak inductor current is found using:
An inductor with a minimum RMS current rating of 2.0 A and minimum saturation current rating of 2.25 A is
required. A Coilcraft MSS1278-223ML 22-
µH, 6.8-A inductor is selected.
A schottky diode is selected as a rectifier diode for its low forward voltage drop. Allowing 20% over VIN for
ringing on the switch node, the required minimum reverse break-down voltage of the rectifier diode is:
34
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Copyright © 2007, Texas Instruments Incorporated
Product Folder Link(s): TPS54283 TPS54286



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