GE Industrial Solutions Austin MicroLynx II 12V SIP - Manual (Page 10)

Data Sheet
January 18, 2010
Austin MicroLynx II TM 12V SIP Non-isolated Power Modules:
8.3 – 14Vdc input; 0.75Vdc to 5.5Vdc Output; 6A output current
LINEAGE POWER 10
Test Configurations
TO OSCILLOSCOPE CURRENT PROBE
L TEST
1μH
B
A
TTE
R
Y
C S 1000μF
Electrolytic
E.S.R.<0.1 Ω
@ 20°C 100kHz
2x100μF
Tantalum
V
IN
(+)
COM
NOTE: Measure input reflected ripple current with a simulated
source inductance (L
TEST
) of 1μH. Capacitor C
S
offsets
possible battery impedance. Measure current as shown
above.
C IN
Figure 24. Input Reflected Ripple Current Test
Setup.
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.
V O (+)
COM
1uF .
RESISTIVE
LOAD
SCOPE
COPPER STRIP
GROUND PLANE
10uF
Figure 25. Output Ripple and Noise Test Setup.
V
O
COM
V
IN
(+)
COM
R
LOAD
R contact R distribution
R contact R distribution R contact
R contact R distribution
R distribution
V IN
V
O
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.
η =
V
O
. I
O
V
IN
. I
IN
x 100 % Efficiency
Design Considerations
Input Filtering
The Austin MicroLynx TM II 12V SIP module should
be connected to a low-impedance source. A
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
stability.
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 #:
C4532X5R1C226M) at full load.
0
50
100
150
200
250
300
350
0 1 2 3 4 5 6
Input Rip
pl
e Voltag
e (mVp-p)
Tantalum
Ceramic
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).