Data Sheet
Austin SuperLynxTM 12V SMT Non-isolated Power Modules:
10 – 14Vdc input; 0.75Vdc to 5.5Vdc Output; 16A output current
April 8, 2008
Test Configurations
Design Considerations
Input Filtering
CURRENT PROBE
TO OSCILLOSCOPE
The Austin SuperLynxTM 12V SMT module should be
connected to a low-impedance source. A highly inductive
LTEST
VIN(+)
1μH
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
CIN
CS 1000μF
Electrolytic
ensure module stability.
2x100μF
Tantalum
E.S.R.<0.1Ω
@ 20°C 100kHz
In a typical application, 6x47 µF low-ESR tantalum
capacitors (AVX part #: TPSE476M025R0100, 47µF 25V
100 mΩ ESR tantalum capacitor) will be sufficient to
provide adequate ripple voltage at the input of the
module. To further minimize ripple voltage at the input,
very low ESR ceramic capacitors are recommended at
the input of the module. Figure 26 shows input ripple
voltage (mVp-p) for various outputs with 6x47 µF
tantalum capacitors and with 6x22 µF ceramic capacitor
COM
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
(TDK part #: C4532X5R1C226M) at full load.
.
VO(+)
COM
RESISTIVE
LOAD
350
1uF
.
10uF
SCOPE
300
250
200
150
10 0
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.
Figure 24. Output Ripple and Noise Test Setup.
Tantalum
Ceramic
5
Rdistribution Rcontact
Rcontact Rdistribution
0
VIN(+)
VO
0
1
2
3
4
6
Output Voltage (Vdc)
RLOAD
VO
VIN
Figure 26. Input ripple voltage for various output
with 6x47 µF tantalum capacitors and with 6x22 µF
ceramic capacitors at the input (full load).
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 ]
