NSR003A0X_10 Datasheet, PDF (16/20 Pages) Lineage Power Corporation – Naos Raptor 3A: Non-Isolated DC-DC Power Modules

Data Sheet
December 6, 2010
Naos Raptor 3A: Non-isolated DC-DC Power Modules
4.5 – 14Vdc input; 0.59Vdc to 6Vdc Output; 3A output current
Feature Descriptions (continued)
Vo
Rmargin-down
MODULE
Q2
Trim
Rmargin-up
Rtrim
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
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
Q1
GND
Figure 51. Circuit Configuration for margining
Output voltage.
Monotonic Start-up and Shutdown
The Naos Raptor 3A 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 3A 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 VOUT and TRIM pins of the module, as shown in
Fig. 52. 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.
MODULE
TRIM
GND
RTUNE
CTUNE
RTrim
Figure. 52. 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 1.5A
step load with Vin=12V.
Vout 5V 3.3V 2.5V
Cext 47μF 47μF 47μF
RTUNE ₁₅₀
150
100
CTUNE _{4700pF 4700pF 10nF}
ΔV _{57mV 57mV 44mV}
1.8V
2x47μF
75
22nF
31mV
1.2V 0.69V
3x47μF +
3x47μF _330μF
Polymer
47
47
33nF 120nF
23mV 12mV
Table 4. General recommended values of of RTUNE
and CTUNE for Vin=12V and various external ceramic
capacitor combinations.
Cext
RTUNE
CTUNE
1x47μF
150
4700pF
2x47μF
75
22nF
4x47μF
47
39nF
6x47μF
47
47nF
10x47μF
47
56nF
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 1.5A to 3A step change (50% of full load),
LINEAGE POWER
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