Data Sheet
Austin MiniLynxTM 12V SMT Non-isolated Power Modules:
8.3 – 14Vdc input; 0.75Vdc to 5.5Vdc Output; 3A output current
March 31, 2008
Test Configurations
Design Considerations
Input Filtering
CURRENT PROBE
TO OSCILLOSCOPE
The Austin MiniLynxTM 12V SMT module should be
connected to a low-impedance source. A highly
LTEST
VIN(+)
1μH
inductive source can 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 module stability in the presence of
inductive traces that supply input voltage to the
module.
CIN
CS 1000μF
Electrolytic
2x100μF
Tantalum
E.S.R.<0.1Ω
@ 20°C 100kHz
COM
In a typical application, a 22 µF low-ESR ceramic
capacitors will be sufficient to provide adequate ripple
voltage at the input of the module. To further
minimize ripple voltage at the input, additional
ceramic capacitors are recommended at the input of
the module. Figure 26 shows input ripple voltage
(mVp-p) for various outputs with 10µF and with a
22µF ceramic capacitor at full load.
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.
Figure 23. Input Reflected Ripple Current Test
Setup.
COPPER STRIP
350
1 x 10uF
300
VO(+)
COM
RESISTIVE
LOAD
1 x 22uF
250
1uF
.
10uF
SCOPE
200
150
100
50
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.
0
Figure 24. Output Ripple and Noise Test Setup.
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
5.5
Figure 26. Input ripple voltage for various outputs
with a 10 µF or a 22 µF ceramic capacitor at the
input (full-load).
Rdistribution Rcontact
Rcontact Rdistribution
VIN(+)
VO
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.
Figure 25. Output Voltage and Efficiency Test
Setup.
VO. IO
Efficiency
=
x
100 %
η
VIN. IIN
LINEAGE POWER
10
LINEAGEPOWER [ LINEAGE POWER CORPORATION ]
