SLIN-12F2A BEL [Bel Fuse Inc.], SLIN-12F2A Datasheet - Page 17

• Manufacturer Part Number: SLIN-12F2A
• Description: NON-ISOLATED DC/DC CONVERTERS
• Manufacturer: BEL [Bel Fuse Inc.]

Tunable Loop
The SLIN-12F2Ax modules have a new feature that optimizes transient response of the module called Tunable
Loop
External capacitors are usually added to the output of the module for two reasons: to reduce output ripple and
noise and to reduce output voltage deviations 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
connected to the output of the module. The Tunable Loop
the SENSE and TRIM pins of the module. This R-C allows the user to externally adjust the voltage loop feedback
compensation of the module.
Recommended values of R
and 5. Tables 2 and 4 show the recommended values of R
capacitors up to 940uF that might be needed for an application to meet output ripple and noise requirements for
5Vin and 3.3Vin respectively. Selecting R
module.
In applications with tight output voltage limits in the presence of dynamic current loading, additional output
capacitance will be required. Tables 3 and 5 list recommended values of R
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 5Vin and 3.3Vin respectively.
Table 2 .General recommended values of R
combinations.
December 2, 2010
R
C
Co
NON-ISOLATED DC/DC CONVERTERS
2.4 Vdc - 5.5 Vdc Input, 0.6 Vdc - 3.63 Vdc /12 A Output
TUNE
TUNE
TM
.
Circuit diagram showing connection of R
1x47μF
1500pF
47
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 • Tel [phone] • Fax [phone] •
TM
TM
allows the user to externally adjust the voltage control loop to match the filter network
3900pF
2x47μF
47
TUNE
and C
4x47μF
10nF
47
TUNE
MODULE
TUNE
for different output capacitor combinations are given in Tables 2, 3, 4
TUNE
GND
10x47μF 20x47μF
33nF
and C
33
and C
SENSE
VOUT
TRIM
TUNE
TUNE
Bel Power Inc., a subsidiary of Bel Fuse Inc.
TUNE
and C
56nF
according to Table 2 will ensure stable operation of the
TM
22
for Vin=5V and various external ceramic capacitor
TUNE
is implemented by connecting a series R-C between
TUNE
RTUNE
CTUNE
RTrim
and C
to tune the control loop of the module
C O
TUNE
for different values of ceramic output
TUNE
and C
TUNE
in order to meet 2%
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17