GE Industrial Solutions 6A Austin MicroLynx II - Manual (Page 10)

GE Energy
Data Sheet
6A Austin MicroLynx TM II: Non-Isolated DC-DC Power Modules
8.3Vdc –14Vdc input; 0.75Vdc to 5.5Vdc output; 6A Output Current
October 16, 2012 ©2012 General Electric Company. All rights reserved. Page 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 SMT 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.
Input Ri
pp
le
Vol
tag
e
(m
Vp
-p)
0
50
100
150
200
250
300
350
0 1 2 3 4 5 6
Ceramic
Tantalum
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).