GE Industrial Solutions 9-36V ProLynx 3A - Manual (Page 10)

GE Data Sheet
9-36V ProLynx TM 3A: Non-Isolated DC-DC Power Modules
9Vdc –36Vdc input; 3Vdc to 18Vdc output; 3A to 1.5A Scaled output current
9Vdc –24Vdc input; -3.3Vdc to -12Vdc output; 3A to 0.7A Scaled output current
July 23, 2013 ©2013 General Electric Company. All rights reserved. Page 10
Test Configurations
TO OSCILLOSCOPE CURRENT PROBE
L
TEST
1μH
BAT
T
E
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 25. 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.
Vo+
COM
0.1uF
RESISTIVE
LOAD
SCOPE USING
BNC SOCKET
COPPER STRIP
GROUND PLANE
10uF
Figure 26. 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 27 Output Voltage and Efficiency Test Setup.
η =
V
O
. I
O
V
IN
. I
IN
x 100 % Efficiency
Design Considerations
Input Filtering
The 9-36V ProLynx TM module should be connected to a low
ac-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.
To minimize input voltage ripple, ceramic capacitors are
recommended at the input of the module. Figure 28 shows
the input ripple voltage for various output voltages at
maximum load current with 2x10 µF or 3x10 µF ceramic
capacitors and an input of 12V while Fig. 29 shows the input
ripple for an input voltage of 28V.
Inp
ut Ri
pple Vo
ltag
e
(mVp-p)
Output Voltage (Vdc)
Figure 28. Input ripple voltage for various output voltages
with 2x10 µF or 3x10 µF ceramic capacitors at the input
(maximum load). Input voltage is 12V
In
put Ri
pple Vo
ltag
e (
m
Vp-p)
Output Voltage (Vdc)
Figure 29. Input ripple voltage for various output voltages
with 2x10 µF or 3x10 µF ceramic capacitors at the input
(maximum load). Input voltage is 28V
40
60
80
100
120
140
160
180
3 4 5 6 7 8
2x10uF
3x10uF
60
80
100
120
140
160
180
200
220
3 5 7 9 11 13 15 17
2x10uF
3x10uF