GE Industrial Solutions 2A PicoTLynx - Manual (Page 16)

GE
Data Sheet
2A PicoTLynx TM : Non-Isolated DC-DC Power Modules
3Vdc –14Vdc input; 0.6Vdc to 5.5Vdc output; 2A Output Current
February 26, 2013 ©2013 General Electric Company. All rights reserved. Page 16
MODULE
VOUT
SENSE
TRIM
GND
RTUNE
CTUNE
RTrim
C O
Figure. 58. 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 Tables 2 and 3. Table 2
shows the recommended values of R
TUNE
and C
TUNE
for different
values of ceramic output capacitors up to 470uF 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. Tables 3,4 and 5 list 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 1A to 2A
step change (50% of full load), for input voltages of 12V, 5V and
3.3V respectively.
Please contact your GE Critical Power 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 or input voltages other than 12V.
Table 2. General recommended values of of R
TUNE
and C
TUNE
for Vin=12V/5V/3.3V and various external ceramic capacitor
combinations.
Co 1x47 μF 2x47μF 3x47μF 4x47μF 10x47μF
R
TUNE
220 150 100 100 100
C
TUNE
3900pF 10nF 18nF 18nF 22nF
Table 3. Recommended values of R
TUNE
and C
TUNE
to obtain
transient deviation of ≤2% of Vout for a 1A step load with
Vin=12V
Vo 5V 3.3V 2.5V 1.8V 1.2V 0.6V
Co 1x22μF 1x47μF 2x47μF 2x47μF 3x47μF 330μF
Polymer
R
TUNE
220 220 150 150 100 100
C
TUNE
2200pF 3900pF 10nF 10nF 18nF 68nF
ΔV 81mV 61mV 35mV 34mV 23mV 12mV
Table 4. Recommended values of R
TUNE
and C
TUNE
to obtain
transient deviation of ≤2% of Vout for a 1A step load with
Vin=5V
Vo 3.3V 2.5V 1.8V 1.2V 0.6V
Co 1x47μF 2x47μF 2x47μF 3x47μF 330μF
Polymer
R
TUNE
220 150 150 100 100
C
TUNE
3900pF 10nF 10nF 18nF 68nF
ΔV 62mV 35mV 34mV 23mV 12mV
Table 5. Recommended values of R
TUNE
and C
TUNE
to
obtain transient deviation of ≤2% of Vout for a 1A step
load with Vin=3.3V
Vo 2.5V 1.8V 1.2V 0.6V
Co 3x47 μF 2x47μF 3x47μF
330 μF
Polymer
R
TUNE
100 150 100 100
C
TUNE
18nF 10nF 18nF 68nF
ΔV 48mV 34mV 23mV 12mV