TPS54383, TPS54386
www.ti.com
SLUS774B–AUGUST 2007–REVISED OCTOBER 2007
DESIGN EXAMPLES
Example 1: Detailed Design of a 12-V to 5-V and 3.3-V Converter
The following example illustrates a design process and component selection for a 12-V to 5-V and 3.3-V dual
non-synchronous buck regulator using the TPS54383 converter. Design Example List of Materials and Table 4,
Definition of Symbols is found at the end of this section.
PARAMETER
NOTES AND CONDITIONS
MIN
NOM
MAX
UNIT
INPUT CHARACTERISTICS
VIN
IIN
Input voltage
6.9
12.0
1.6
12
13.2
2.0
20
V
A
Input current
VIN = nom, IOUT = max
VIN = nom, IOUT = 0 A
No load input current
mA
OUTPUT CHARACTERISTICS
VOUT1
VOUT2
Output voltage 1
Output voltage 2
Line regulation
Load regulation
VIN = nom, IOUT = nom
VIN = nom, IOUT = nom
VIN = min to max
4.8
3.2
5.0
3.3
5.2
3.4
1%
1%
V
IOUT = min to max
VOUT(ripple
Output voltage ripple
VIN = nom, IOUT = max
50
mVPP
)
IOUT1
IOUT2
Output current 1
Output current 2
VIN = min to max
VIN = min to max
0
0
2.0
2.0
Output overcurrent channel
1
A
IOCP1
IOCP2
VIN = nom, VOUT = VOUT1 = 5%
VIN = nom, VOUT = VOUT2 = 5%
ΔIOUT = 1 A @ 3 A/µs
2.4
2.4
3
3
3.5
3.5
Output overcurrent channel
2
Transient response ΔVOUT
from load transient
200
1
mV
ms
Transient response settling
time
SYSTEM CHARACTERISTICS
fSW
Switching frequency
Full load efficiency
250
0
310
370
60
kHz
η
85%
Operating temperature
range
TJ
25
°C
+
+
+
Figure 39. Design Example Schematic
Copyright © 2007, Texas Instruments Incorporated
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