Data Sheet
Naos Raptor 10A: Non-Isolated DC-DC Power Modules
August 14, 2009
4.5 – 14Vdc input; 0.59Vdc to 6Vdc Output; 10A output current
with an input voltage of 12V. Table 4 shows the
Feature Descriptions (continued)
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.
Vo
Rmargin-down
MODULE
Q2
Trim
Rmargin-up
VOUT
Rtrim
RTUNE
Q1
GND
MODULE
CTUNE
Figure 51. Circuit Configuration for margining
Output voltage.
TRIM
RTrim
GND
Monotonic Start-up and Shutdown
The Naos Raptor 10A modules have monotonic start-up
and shutdown behavior for any combination of rated
input voltage, output current and operating temperature
range.
Figure. 52. Circuit diagram showing connection of
R
TUME and CTUNE to tune the control loop of the
module.
Tunable LoopTM
Table 3. Recommended values of RTUNE and CTUNE to
obtain transient deviation of 2% of Vout for a 5A
step load with Vin=12V.
The Naos Raptor 10A modules have a new feature that
optimizes transient response of the module called
Tunable LoopTM. 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.
Vout
Cext
5V
3.3V
2.5V
1.8V
1.2V
0.69V
330μF 330μF 2x330μF 3x330μF 9x330μF
Polymer Polymer Polymer Polymer Polymer
4x47μF
RTUNE
CTUNE
ΔV
47
47
47
47
30
30
39nF 100nF 100nF 220nF
86mV 49mV 49mV 30mV
330nF
23mV
330nF
12mV
Table 4. General recommended values of of RTUNE
and CTUNE for Vin=12V and various external ceramic
capacitor combinations.
To use the additional external capacitors in an optimal
manner, the Tunable LoopTM 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.
Cext
1x47μF 2x47μF 4x47μF 10x47μF 20x47μF
RTUNE
100
75
47
47
47
CTUNE 12nF
22nF
39nF
68nF
100nF
Recommended values of RTUNE and CTUNE are given in
Tables 3 and 4. Table 3 lists recommended values of
R
TUNE 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),
LINEAGE POWER
16
LINEAGEPOWER [ LINEAGE POWER CORPORATION ]
