NSR040A0X_11 Datasheet, PDF (14/18 Pages) Lineage Power Corporation – Naos Raptor 40A Non-Isolated Power Modules

Data Sheet
January 14, 2011
Naos Raptor 40A Non Isolated Power Module:
5 – 13.8Vdc input; 0.6Vdc to 5.0Vdc Output; 40A output current
Feature Descriptions (continued)
Tunable Loop^TM
The Naos Raptor 40A modules have a new feature
that optimizes transient response of the module called
Tunable Loop^TM. External capacitors are usually
added to improve output voltage transient response
due to load current changes. Sensitive loads may
also require additional output capacitance to reduce
output ripple and noise. 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.
To use the additional external capacitors in an optimal
manner, the Tunable Loop^TM feature allows the loop
to be tuned externally by connecting a series R-C
between the SENSE and TRIM pins of the module, as
shown in Fig. 44. This R-C allows the user to
externally adjust the voltage loop feedback
compensation of the module to match the filter
network connected to the output of the module.
Recommended values of RTUNE and CTUNE are given
in Tables 2 and 3. Table 2 lists recommended values
of RTUNE and CTUNE 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. Table
3 shows the recommended values of RTUNE and CTUNE
for different values of ceramic output capacitors up to
1500uF, again for an input voltage of 12V. The value
of RTUNE should never be lower than the values shown
in Tables 2 and 3. Please contact your Lineage 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.
VOUT
SENSE+
MODULE
TRIM+
TRIM-
RTune
CTune
RTrim
Figure. 44. Circuit diagram showing connection of
RTUME and CTUNE to tune the control loop of the
module.
Table 2. Recommended values of RTUNE and CTUNE
to obtain transient deviation of 2% of Vout for a
20A step load with Vin=12V.
Vout 5V 3.3V 2.5V 1.8V 1.2V 0.69V
6x47μF 2x47μF 4x47μF 3x47μF 2x47μF 2x47μF
Cext ⁺
+
+
+
+
+
330μF 3x330μF 4x330μF 6x330μF 10x330μF 22x330μF
Polymer Polymer Polymer Polymer Polymer Polymer
RTUNE
75
62
62
39
39
30
CTUNE _{10nF 18nF 27nF 47nF 68nF 180nF}
ΔV _{100mV 64mV 50mV 36mV 24mV 12mV}
Table 3. General recommended values of of RTUNE
and CTUNE for Vin=12V and various external
ceramic capacitor combinations.
Cext
RTUNE
CTUNE
2x47μF 4x47μF
75
75
3300pF 4700pF
10x47μF
39
8.2nF
20x47μF 30x47μF
33
30
12nF
18nF
LINEAGE POWER
14