Data Sheet
Austin LynxTM II 12V SIP Non-isolated Power Modules:
March 30, 2008
8.3 – 14Vdc input; 0.75Vdc to 5.5Vdc Output; 10A output current
Test Configurations
Design Considerations
Input Filtering
CURRENT PROBE
TO OSCILLOSCOPE
Austin LynxTM II SIP module should be connected to a
low-impedance source. A highly inductive source can
LTEST
VIN(+)
1μH
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
CIN
CS 1000μF
Electrolytic
module stability.
2x100μF
Tantalum
E.S.R.<0.1Ω
@ 20°C 100kHz
In a typical application, 4x47 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 26 shows input ripple voltage
(mVp-p) for various outputs with 4x47 µF tantalum
capacitors and with 4x22 µF ceramic capacitor (TDK
part #: C4532X5R1C226M) at full load.
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
VO(+)
COM
RESISTIVE
LOAD
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
50
0
Figure 24. Output Ripple and Noise Test Setup.
Ceramic
0
1
2
3
4
5
6
Rdistribution Rcontact
Rcontact Rdistribution
VIN(+)
VO
Output Voltage (Vdc)
RLOAD
Figure 26. Input ripple voltage for various output
with 4x47 µF tantalum capacitors and with 4x22 µF
ceramic capacitors at the input (full load).
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 ]
