Data Sheet
Austin MegaLynxTM SMT: Non-Isolated DC-DC Power Modules:
4.5 – 5.5Vdc input; 0.8 to 3.63Vdc Output; 30A output current
6.0 – 14Vdc Input; 0.8Vdc to 3.63Vdc Output; 20/30A output
June 3, 2009
Test Configurations
Design Considerations
The Austin MegaLynxTM module should be
connected to a low-impedance source. A highly
inductive source can affect the stability of the
CURRENT PROBE
TO OSCILLOSCOPE
module. An input capacitor must be placed directly
adjacent to the input pin of the module, to minimize
LTEST
VIN(+)
1μH
input ripple voltage and ensure module stability.
CIN
Min
To minimize input voltage ripple, low-ESR ceramic
capacitors are recommended at the input of the
module. Figure 46 shows the input ripple voltage for
CS 220μF
E.S.R.<0.1Ω
150μF
@ 20°C 100kHz
various output voltages at 30A of load current with
COM
1x22 µF or 2x22 µF ceramic capacitors and an
input of 12V. Figure 47 shows data for the 5Vin
case, with 2x22µF and 2x47µF of ceramic
capacitors at the input, and for a load current of
30A.
NOTE: Measure input reflected ripple current with a simulated
source inductance (LTEST) of 1μH. Capacitor CS offsets
possible battery impedance. Measure current as shown
above.
350
Figure 43. Input Reflected Ripple Current Test
Setup.
1 x 22uF
300
2 x 22uF
250
COPPER STRIP
200
150
100
50
VO(+)
COM
RESISTIVE
LOAD
1uF
.
10uF
SCOPE
GROUND PLANE
0
NOTE: All voltage measurements to be taken at the module
terminals, as shown above. If sockets are used then
Kelvin connections are required at the module terminals
to avoid measurement errors due to socket contact
resistance.
0.5
1
1.5
2
2.5
Output Voltage (Vdc)
Figure 46. Input ripple voltage for various
output voltages with 1x22 µF or 2x22 µF ceramic
capacitors at the input (30A load). Input voltage
is 12V.
Figure 44. Output Ripple and Noise Test Setup.
Rdistribution Rcontact
Rcontact Rdistribution
VIN(+)
VO
120
100
80
RLOAD
VO
VIN
Rdistribution Rcontact
Rcontact Rdistribution
60
COM
COM
40
NOTE: All voltage measurements to be taken at the module
terminals, as shown above. If sockets are used then
Kelvin connections are required at the module terminals
to avoid measurement errors due to socket contact
resistance.
2 x 22uF
20
2 x 47uF
0
0.5
1
1.5
2
2.5
3
3.5
Figure 45. Output Voltage and Efficiency Test
Setup.
Output Voltage (Vdc)
Figure 47. Input ripple voltage in mV, p-p for
various output voltages with 2x22 µF or 2x47 µF
ceramic capacitors at the input (30A load). Input
voltage is 5V.
VO. IO
Efficiency
=
x
100 %
η
VIN. IIN
LINEAGE POWER
14
LINEAGEPOWER [ LINEAGE POWER CORPORATION ]
