NQR010A0X Datasheet, PDF (16/20 Pages) Lineage Power Corporation – Non-Isolated DC-DC Power Modules 4.5Vdc –14Vdc input; 0.59Vdc to 6Vdc Output;10A Output Current

Data Sheet
January 14, 2011
NQR010A0X4: Non-Isolated DC-DC Power Modules
4.5 – 14Vdc input; 0.59Vdc to 6Vdc Output; 10A output current
Feature Descriptions (continued)
Vo
Rmargin-down
MODULE
Q2
Trim
Rmargin-up
Rtrim
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 1000uF, 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
Q1
GND
Figure 51. Circuit Configuration for margining
Output voltage.
Monotonic Start-up and Shutdown
The NQR010A0X4 10A 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 NQR010A0X4 10A 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 2. Recommended values of RTUNE and CTUNE to
obtain transient deviation of 2% of Vout for a 5A
step load with Vin=12V.
Vout 5V 3.3V 2.5V 1.8V 1.2V 0.6V
Cext
4x47μF
330μF
Polymer
330μF
Polymer
2x330μF
Polymer
3x330μF
Polymer
9x330μF
Polymer
RTUNE ₄₇
47
47
47
47
30
CTUNE _{39nF 100nF 100nF 220nF 220nF 330nF}
ΔV _{76mV 39mV 39mV 25mV 22mV 12mV}
Table 3. General recommended values of of RTUNE
and CTUNE for Vin=12V and various external ceramic
capacitor combinations.
Cext 1x47μF 2x47μF
RTUNE 100
75
CTUNE 12nF 22nF
4x47μF 6x47μF 10x47μF
47
47
47
39nF 56n 68nF
20x47μF
47
100nF
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 5A to 10A step change (50% of full load),
LINEAGE POWER
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