Data Sheet
Austin MegaLynxTM SMT: Non-Isolated DC-DC Power Modules:
2.7 – 4.0Vdc input; 0.8 to 2.0Vdc Output; 30A output current
October 21, 2009
Test Configurations
Design Considerations
The ATM030 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 capacitor
must be placed directly adjacent to the input pin of
the module, to minimize input ripple voltage and
LTEST
VIN(+)
1μH
ensure module stability.
CIN
Min
To minimize input voltage ripple, low-ESR ceramic
capacitors are recommended at the input of the
module. Figure 28 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
1x47 µF or 2x47 µF ceramic capacitors and an
input of 3.3V.
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.
100
90
80
70
60
50
40
Figure 25. Input Reflected Ripple Current Test
Setup.
COPPER STRIP
VO(+)
COM
RESISTIVE
LOAD
1 x 47uF
2 x 47uF
1uF
.
10uF
SCOPE
0.5
1
1.5
2
GROUND PLANE
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.
Output Voltage (Vdc)
Figure 28. Input ripple voltage for various
output voltages with 1x47 µF or 2x47 µF ceramic
capacitors at the input (30A load). Input voltage
is 3.3V.
Figure 26. Output Ripple and Noise Test Setup.
Rdistribution Rcontact
Rcontact Rdistribution
Safety Considerations
VIN(+)
VO
For safety agency approval the power module must
be installed in compliance with the spacing and
separation requirements of the end-use safety
agency standards, i.e., UL 60950, CSA C22.2 No.
60950-00, EN60950 (VDE 0850) (IEC60950, 3rd
edition) Licensed.
RLOAD
VO
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.
For the converter output to be considered meeting
the requirements of safety extra-low voltage
(SELV), the input must meet SELV requirements.
The power module has extra-low voltage (ELV)
outputs when all inputs are ELV.
Figure 27. Output Voltage and Efficiency Test
Setup.
An input fuse for the module is recommended. As
an option to using a fuse, no fuse is required, if the
module is powered by a power source with current
limit protection and the module is evaluated in the
end-use equipment.
VO. IO
Efficiency
=
x
100 %
η
VIN. IIN
LINEAGE POWER
10
LINEAGEPOWER [ LINEAGE POWER CORPORATION ]
