NSR020A0X43Z Datasheet, PDF (15/19 Pages) Lineage Power Corporation – 4.5 - 14Vdc input; 0.59Vdc to 6Vdc Output; 20A output current

Data Sheet
July 28, 2009
Naos Raptor 20A: Non Isolated Power Module:
4.5 – 14Vdc input; 0.59Vdc to 6Vdc Output; 20A output current
Vo
Rmargin-down
MODULE
Q2
Trim+
Rmargin-up
Rtrim
Q1
Trim-
Figure 50. Circuit Configuration for margining Output
voltage.
Monotonic Start-up and Shutdown
The Naos Raptor 20A modules have monotonic start-up
and shutdown behavior for any combination of rated input
voltage, output current and operating temperature range.
Tunable Loop^TM
The Naos Raptor 20A 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.
51. 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.
for an input voltage of 12V. The value of RTUNE should
never be lower than the values shown in Tables 3 and 4.
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. 51. Circuit diagram showing connection of
RTUME and CTUNE to tune the control loop of the
module.
Table 3. Recommended values of RTUNE and CTUNE to
obtain transient deviation of 2% of Vout for a 10A
step load with Vin=12V.
Vout 5V 3.3V 2.5V 1.8V 1.2V 0.69V
4x47μF 2x47μF 6x47μF
Cext
330μF
Polymer
+
330μF
+
+ _{7x330μF 23x330μF}
2x330μF 3x330μF _{Polymer Polymer}
Polymer Polymer Polymer
RTUNE
75
51
51
51
51
31
CTUNE _{100nF 150nF 220nF 330nF 330nF 330nF}
ΔV _{94mV 66mV 50mV 36mV 24mV 12mV}
Table 4. General recommended values of of RTUNE and
CTUNE for Vin=12V and various external ceramic
capacitor combinations.
Cext 2x47μF 4x47μF 6x47μF 10x47μF 20x47μF 30x47μF
RTUNE
75
75
75
51
51
51
CTUNE 15nF 27nF 33nF 47nF 68nF 82nF
Recommended values of RTUNE and CTUNE are given in
Tables 3 and 4. Table 3 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 5A to 10A step change (50% of full load),
with an input voltage of 12V. Table 4 shows the
recommended values of RTUNE and CTUNE for different
values of ceramic output capacitors up to 1000uF, again
LINEAGE POWER
15