Data Sheet
Austin MegaLynxTM: Non-Isolated DC-DC Power Modules:
4.5 – 5.5Vdc input; 0.8 – 3.63Vdc output; 30A output current
6.0 – 14Vdc input; 0.8 – 5.5Vdc output; 25A output current
June 3, 2009
Test Configurations
Design Considerations
The Austin MegaLynxTM module should be connected to
a low-impedance source. A highly inductive source can
CURRENT PROBE
TO OSCILLOSCOPE
affect the stability of the module. An input capacitance
must be placed directly adjacent to the input pin of the
module, to minimize input ripple voltage and ensure
LTEST
VIN(+)
1μH
module stability.
CIN
Min
To minimize input voltage ripple, low-ESR ceramic
capacitors are recommended at the input of the module.
Figure 41 shows the input ripple voltage for various
CS 220μF
E.S.R.<0.1Ω
150μF
@ 20°C 100kHz
output voltages at 25A of load current with 2x22 µF or
COM
4x22 µF ceramic capacitors and an input of 12V. Figure
42 shows data for the 5Vin case, with 2x47µF and
4x47µF 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.
180
2 x 22uF
4 x 22uF
160
140
120
100
80
Figure 37. Input Reflected Ripple Current Test Setup.
COPPER STRIP
VO(+)
GND
RESISTIVE
LOAD
SCOPE
60
40
0.01uF
10uF
0.1uF
20
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
Output Voltage (Vdc)
Figure 41. Input ripple voltage for various output
2
2.5
3
3.5
4
4.5
5
5.5
Figure 38. Output Ripple and Noise Test Setup.
voltages with 2x22 µF or 4x22 µF ceramic capacitors
at the input (25A load). Input voltage is 12V.
Rdistribution Rcontact
Rcontact Rdistribution
60
VIN(+)
VO
2 x 47uF
50
4 x 47uF
RLOAD
VO
40
30
20
10
0
VIN
Rdistribution Rcontact
Rcontact Rdistribution
COM
COM
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
3
3.5
Figure 40. Output Voltage and Efficiency Test Setup.
Output Voltage (Vdc)
VO. IO
Figure 42. Input ripple voltage in mV, p-p for various
output voltages with 2x47 µF or 4x47 µF ceramic
capacitors at the input (25A load). Input voltage is
5V.
Efficiency
=
x
100 %
η
VIN. IIN
LINEAGE POWER
12
LINEAGEPOWER [ LINEAGE POWER CORPORATION ]
