Data Sheet
Austin LynxTM II SMT Non-isolated Power Modules:
August 28, 2009
2.4 – 5.5Vdc input; 0.75Vdc to 3.63Vdc Output; 10A output current
Test Configurations
Design Considerations
Input Filtering
CURRENT PROBE
TO OSCILLOSCOPE
The Austin LynxTM II SMT module should be connected
to a low ac-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 ensure module stability.
CIN
CS 1000μF
Electrolytic
2x100μF
Tantalum
E.S.R.<0.1Ω
@ 20°C 100kHz
To minimize input voltage ripple, low-ESR polymer and
COM
ceramic capacitors are recommended at the input of the
module. Figure 27 shows input ripple voltage (mVp-p)
for various outputs with 1x150 µF polymer capacitors
(Panasonic p/n: EEFUE0J151R, Sanyo p/n:
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.
6TPE150M) in parallel with 1 x 47 µF ceramic capacitor
(Panasonic p/n: ECJ-5YB0J476M, Taiyo- Yuden p/n:
CEJMK432BJ476MMT) at full load. Figure 28 shows
the input ripple with 3x150 µF polymer capacitors in
parallel with 2 x 47 µF ceramic capacitor at full load.
Figure 24. Input Reflected Ripple Current Test
Setup.
COPPER STRIP
160
3.3Vin
VO(+)
COM
RESISTIVE
LOAD
140
5Vin
1uF
.
10uF
SCOPE
120
100
80
60
40
20
0
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 25. Output Ripple and Noise Test Setup.
0
0.5
1
1.5
2
2.5
3
3.5
Rdistribution Rcontact
Rcontact Rdistribution
VIN(+)
VO
Output Voltage (Vdc)
Figure 27. Input ripple voltage for various outputs
with 1x22 µF ceramic capacitor at the input (full-
load).
RLOAD
VO
VIN
16 0
Rdistribution Rcontact
Rcontact Rdistribution
3.3Vin
COM
COM
14 0
5Vin
12 0
10 0
80
60
40
20
0
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
0
0.5
1
1.5
2
2.5
3
3.5
Output Voltage (Vdc)
Figure 28. Input ripple voltage for various outputs
with 1x47 µF ceramic capacitor at the input (full
load).
LINEAGE POWER
10
LINEAGEPOWER [ LINEAGE POWER CORPORATION ]
