FGLS12SR6040A Datasheet, PDF (11/21 Pages) List of Unclassifed Manufacturers – 4.5-14.4Vdc Input, 40A, 0.6-2.0Vdc Output

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FGLS12SR6040*A
4.5-14.4Vdc Input, 40A, 0.6-2.0Vdc Output
Preliminary Data Sheet
from the steady-state value in the presence of
dynamic load current changes. Adding external
capacitance however affects the voltage control loop
of the module, typically causing the loop to slow down
with sluggish response. Larger values of external
capacitance could also cause the module to become
unstable.
The Tunable Loop™ allows the user to externally
adjust the voltage control loop to match the filter
network connected to the output of the module. The
Tunable Loop™ is implemented by connecting a
series R-C between the SENSE and TRIM pins of the
module, as shown in Fig-10. This R-C allows the user
to externally adjust the voltage loop feedback
compensation of the module.
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 value of R_TUNE
and C_TUNE for Vin=12V and various external
ceramic capacitor combinations.
Co 6x47uF 8x47uF 10x47uF 12x47uF 20x47uF
R_TUNE 330
C_TUNE 330pF
330
820pF
330 330 2000
1200pF 1500pF 3300pF
Fig-10: Circuit diagram showing connection of
R_TUNE and C_TUNE to tune the control loop of the
module.
Table 3: Recommended values of R_TUNE and
C_TUNE to obtain transient deviation of 2% of
Vout for a 10A step load with Vin=12V.
Vo
1.8V
1.2V
0.6V
4x47uF+
Co 6x330uF
Polymer
4x47uF+
11x330uF
Polymer
4x47uF+
12x680uF
Polymer
R_TUNE
220
200
180
C_TUNE
5600pF
12nF
47nF
△V
34mV
22mV
12mV
Note: The capacitors used in the Tunable Loop
tables are 47uF/3m ESR ceramic, 330uF/12
m ESR polymer capacitor and 680uF/12m
polymer capacitor.
Recommended values of R_TUNE and C_TUNE for different
output capacitor combinations are given in Tables 2.
Table 2 shows the recommended values of R_TUNE and
C_TUNE for different values of ceramic output capacitors
up to 1,000uF 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 20A to
40A step change (50% of full load), with an input
voltage of 12V.
Please contact your FDK technical representative to
Http://www.fdk.com
Page 11 of 21
Ver 1.5 May. 9, 2013