APXH006A0X-SRZ Datasheet, PDF (16/23 Pages) Lineage Power Corporation – 2.4 - 5.5Vdc input; 0.6Vdc to 3.63Vdc output; 6A output current

Data Sheet
May 20, 2009
Pico TLynx^TM 6A: Non-isolated DC-DC Power Modules
2.4 – 5.5Vdc input; 0.6Vdc to 3.63Vdc output; 6A output current
SEQUENCE^TM feature must be disabled. For
additional guidelines on using the EZ-SEQUENCE^TM
feature please refer to Application Note AN04-008
“Application Guidelines for Non-Isolated Converters:
Guidelines for Sequencing of Multiple Modules”, or
contact the Lineage Power technical representative for
additional information.
Tunable Loop^TM
The 5V Pico TLynx^TM 6A modules have a new feature
that optimizes transient response of the module called
Tunable Loop^TM.
External capacitors are usually added to the output of
the module for two reasons: to reduce output ripple and
noise (see Figures 36 and 37) and to reduce output
voltage deviations from the steady-state value in the
presence of dynamic load current changes. 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.
The Tunable Loop^TM allows the user to externally adjust
the voltage control loop to match the filter network
connected to the output of the module. The Tunable
Loop^TM is implemented 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.
VOUT
SENSE
MODULE
TRIM
GND
RTUNE
CO
CTUNE
RTrim
In applications with tight output voltage limits in the
presence of dynamic current loading, additional output
capacitance will be required. Tables 3 and 5 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 3A to 6A
step change (50% of full load), with an input voltage of
5V or 3.3V respectively
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 or input voltages other than 5V.
Table 2. General recommended values of of RTUNE
and CTUNE for Vin=5V and various external ceramic
capacitor combinations.
Cext 1x47μF 2x47μF 4x47μF 6x47μF 10x47μF 20x47μF
RTUNE 47
47
CTUNE 4700pF 10nF
47
33nF
33
47nF
33
56nF
33
68nF
Table 3. Recommended values of RTUNE and CTUNE to
obtain transient deviation of ≤2% of Vout for a 3A
step load with Vin=5V.
Vo 3.3V 2.5V 1.8V 1.2V 0.6V
1 x 47μF 6 x 47μF
Co 3 x 47μF 4 x 47μF 5 x 47μF + 330uF + 330uF
Polymer Polymer
RTUNE
CTUNE
100
15nF
56
18nF
47
27nF
33
47nF
33
39nF
ΔV 58mV 45mV 34mV 24mV 12mV
Table 4. General recommended values of of RTUNE
and CTUNE for Vin=3.3V and various external ceramic
capacitor combinations.
Co 1x47μF 2x47μF 4x47μF 6x47μF 10x47μF 20x47μF
RTUNE
CTUNE
47
10nF
47
15nF
47
39nF
33
47nF
33
68nF
33
82nF
Figure. 44. Circuit diagram showing connection of
RTUME and CTUNE to tune the control loop of the
module.
Recommended values of RTUNE and CTUNE for different
output capacitor combinations are given in Tables 2, 3,
4 and 5. Tables 2 and 4 shows the recommended
values of RTUNE and CTUNE for different values of
ceramic output capacitors up to 940uF that might be
needed for an application to meet output ripple and
noise requirements. Selecting RTUNE and CTUNE
according to Tables 3 or 5 will ensure stable operation
of the module.
Table 5. Recommended values of RTUNE and CTUNE to
obtain transient deviation of ≤2% of Vout for a 3A
step load with Vin=3.3V.
Vo
2.5V
1.8V
1.2V
0.6V
Co
6 x 47μF 6 x 47μF
2 x 47μF +
330uF
Polymer
2 x 330uF
Polymer
RTUNE
CTUNE
33
47nF
33
47nF
33
68nF
33
220nF
ΔV 46mV 33mV
24mV
12mV
LINEAGE POWER
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