Data Sheet
Austin MicroLynx IITM 12V SIP Non-isolated Power Modules:
8.3 – 14Vdc input; 0.75Vdc to 5.5Vdc Output; 6A output current
March 31, 2008
Test Configurations
Design Considerations
Input Filtering
CURRENT PROBE
TO OSCILLOSCOPE
The Austin MicroLynxTM II 12V SIP module should
be connected to a low-impedance source. A
LTEST
VIN(+)
1μH
highly 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
CIN
CS 1000μF
Electrolytic
2x100μF
Tantalum
E.S.R.<0.1Ω
stability.
@ 20°C 100kHz
COM
In a typical application, 2x47 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 minimize ripple voltage at
the input, low ESR ceramic capacitors are
recommended at the input of the module. Figure
27 shows input ripple voltage (mVp-p) for various
outputs with 2x47 µF tantalum capacitors and with
2x 22 µF ceramic capacitor (TDK part #:
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 24. Input Reflected Ripple Current Test
Setup.
COPPER STRIP
C4532X5R1C226M) at full load.
VO(+)
COM
RESISTIVE
LOAD
350
300
250
200
150
1uF
.
10uF
SCOPE
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.
10 0
Tantalum
Ceramic
50
0
Figure 25. Output Ripple and Noise Test Setup.
0
1
2
3
4
5
6
Rdistribution Rcontact
Rcontact Rdistribution
VIN(+)
VO
Output Voltage (Vdc)
Figure 27. Input ripple voltage for various output
with 2x47 µF tantalum capacitors and with 2x22
µF ceramic capacitors at the input (80% of
Io,max).
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 26. Output Voltage and Efficiency Test
Setup.
VO. IO
Efficiency
=
x
100 %
η
VIN. IIN
LINEAGE POWER
10