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SLMA002 Datasheet(PDF) 34 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) 34 Page - Texas Instruments

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4
3
4
IN
m
1
6
3
6
IN
LOAD1
V
F
2
10
13.2
5.82
10
2
10
fc
4.63
V
Fm
50
10
13.2
5.82
10
50
10
1
1
R
1.67
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è
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(47)
1
EA1
CO
LOAD1
OUT1
fc
4.65
K
20
log
20
log
5.80 dB
1
2
f
R
C
1
2
35 kHz
1.67
22 F
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EA
K
5.80 dB
20
20
LOWER
UPPER
COMP1
M
LOWER
10
Z
Z
10
3.83 k
20.5 k
R
38.5 k
R15
38.3 k
g
Z
315 S
3.83 k
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+
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W +
W
=
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(49)
ZERO1
OUT1
LOAD1
1
1
f
4.4 kHz
2
C
R
2
22 F 1.67
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=
=
p ´
´
p ´
m
´
W
(50)
COMP1
POLE1
COMP1
1
1
C
967 pF
C21
1nF
2
f
R
2
4.4 kHz
3.83 k
=
=
=
Þ
=
p ´
´
p ´
´
W
(51)
HF1
CO
COMP
1
1
C
29.6 pF
C23
33 pF
2
4
f
R
2
4
35 kHz
38.3 k
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(52)
TPS55383
,, TPS55386
SLUS818 – SEPTEMBER 2008 ......................................................................................................................................................................................... www.ti.com
Then calculate the converter gain at DC:
Calculate the required error amplifier gain at the desired crossover frequency of 35 kHz:
Then compensation resistor at the output of the error amplifier is:
Calculate the required compensation zero frequency:
Then calculate the compensation capacitor:
The high-frequency pole is placed at eight times the crossover frequency:
Boot-Strap Capacitor
To ensure proper charging of the high-side FET gate and limit the ripple voltage on the boost capacitor, a 47-nF
boot strap capacitor is used.
ILIM2
The current limit must be set above the peak inductor current ILpeak. Comparing ILpeak to the available minimum
current limits, ILIM is connected to BP for a 3.6-A minimum current limit.
SEQ
The SEQ pin is left floating, leaving the enable pins to function independently. If the enable pins are tied
together, the two supplies start-up ratio-metrically. SEQ could also be connected to BP or GND to provide
sequential start-up.
34
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Copyright © 2008, Texas Instruments Incorporated
Product Folder Link(s): TPS55383 TPS55386



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