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SLMA002 Datasheet(PDF) 23 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) 23 Page - Texas Instruments

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Example: TPS54286 Buck Converter Operating at 12-V Input, 3.3-V Output and 400-mAp-p Ripple Current
V
OUT
DIODE
+ V
V
IN
+ VDIODE
3.3
0.5
+
12
0.5
+
d =
=
=30%
(10)
IN
OUT
S
L
V
V
12
3.3
1
L
T
0.3
10.9 H
I
0.4
600000
-
-
=
´ d ´
=
´
´
=
m
D
(11)
(
)
(
)
2
2
6
RES
1
1
C
70 F
10 10
2
3.14
6000
L
2
f
-
=
=
=
m
´
´
´
´
´
´ p ´
(12)
(
)
f
ESR
6
RES
1
1
R
40 m
2
10
C
2
3.14 10
6000
68
10
-
<
=
»
W
´ p ´
´
´
´
´
´
´
´
(13)
100
1M
1k
100k
10k
-20
20
40
80
0
60
-180
-90
-45
45
90
-135
0
180
135
f
Frequency
Hz
-
-
Gain
Phase
-10
10
50
30
70
TPS54283,, TPS54286
SLUS749C – JULY 2007 – REVISED OCTOBER 2007
First, the steady state duty cycle is calculated. Assuming the rectifier diode has a voltage drop of 0.5 V, the duty
cycle is approximated using Equation 10.
The filter inductor is then calculated; see Equation 11.
A custom-designed inductor may be used for the application, or a standard value close to the calculated value
may be used. For this example, a standard 10-
µH inductor is used. Using Figure 27, find the 30% duty cycle
curve. The 30% duty cycle curve has a down slope from low frequency and rises at approximately 6 kHz. This
curve is the resonant frequency that must be compensated. Any frequency wthin an octave of the peak may be
used in calculating the capacitor value. In this example, 6 kHz is used.
A 68-
µF capacitor may be used as a bulk capacitor, with 10-µF of ceramic bypass capacitance in parallel. To
ensure the ESR zero does not significantly impact the loop response, the ESR of the bulk capacitor should be
placed a decade above the resonant frequency.
The resulting loop gain and phase are shown in Figure 30. Based on measurement, loop crossover is 45 kHz
with a phase margin of 60 degrees.
GAIN AND PHASE
vs
FREQUENCY
Figure 30. Example Loop Result
Copyright © 2007, Texas Instruments Incorporated
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Product Folder Link(s): TPS54283 TPS54286



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