GE Industrial Solutions 2 × 12A Digital Dual Output MicroDLynx - Manual (Page 17)

GE
Datasheet
2 × 12A Digital Dual MicroDlynx TM : Non-Isolated DC-DC Power Modules
4.5Vdc –14.4Vdc input; 0.51Vdc to 5.5Vdc output; 2 × 12A Output Current
February 14, 2014 ©2014 General Electric Corporation. All rights reserved. Page 17
Figure. 47. Circuit diagram showing connection of R
TUME
and C
TUNE
to tune the control loop of the module.
Recommended values of R
TUNE
and C
TUNE
for different output
capacitor combinations are given in Table 2. Table 2 shows
the recommended values of R
TUNE
and C
TUNE
for different
values of ceramic output capacitors up to 1000uF that
might be needed for an application to meet output ripple
and noise requirements. Selecting R
TUNE
and C
TUNE
according
to Table 2 will ensure stable operation of the module.
In applications with tight output voltage limits in the
presence of dynamic current loading, additional output
capacitance will be required. Table 3 lists recommended
values of R
TUNE
and C
TUNE
in order to meet 2% output
voltage deviation limits for some common output voltages
in the presence of a 6A to 12A step change (50% of full load),
with an input voltage of 12V.
Please contact your GE technical representative to obtain
more details of this feature as well as for guidelines on how
to select the right value of external R-C to tune the module
for best transient performance and stable operation for
other output capacitance values.
Table 2. General recommended values of of R
TUNE
and
C
TUNE
for Vin=12V and various external ceramic capacitor
combinations.
Table 3. Recommended values of R
TUNE
and C
TUNE
to obtain
transient deviation of 2% of Vout for a 6A step load with
Vin=12V.
Vo 5V 3.3V 2.5V 1.8V 1.2V 0.6V
Co 6x47 μF
3x47 μF
+
330 μF
Polymer
3x47 μF
+
2x330 μF
Polymer
3x47 μF +
2x330 μF
Polymer
3x47 μF +
3x330 μF
Polymer
2x47 μF +
7x330 μF
Polymer
R
TUNE 300 300 300 300 300 300
C
TUNE 470pF 1200pF 1500pF 1800pF 2700pF 12nF
ΔV 84mV 39mV 30mV 27mV 20mV 10mV
Note: The capacitors used in the Tunable Loop tables are
47 μF/2 mΩ ESR ceramic and 330 μF/12 mΩ ESR polymer
capacitors.
Co 3x47 μF 4x47μF 6x47 μF 10x47μF 20x47μF
R
TUNE 300 300 300 300 300
C
TUNE 220pF 330pF 1000pF 1800pF 3900pF
VS+1
MODULE
SIG_GND
TRIM1
VOUT1
RTune
CTune
RTrim
CO
GND
VS+2
MODULE
SIG_GND
TRIM2
VOUT2
RTune
CTune
RTrim
CO
GND