PDT006A0X3-SRZ Datasheet, PDF (17/39 Pages) Lineage Power Corporation – 6A Digital Pico DLynxTM: Non-Isolated DC-DC Power Modules 3Vdc ––14.4Vdc input; 0.45Vdc to 5.5Vdc output; 6A Output Current

Preliminary Data Sheet
October 17, 2011
6A Digital Pico DLynx^TM: Non-isolated DC-DC Power Modules
3 –– 14.4Vdc input; 0.45Vdc to 5.5Vdc output; 6A output current
Synchronization
The module switching frequency can be synchronized to
a signal with an external frequency within a specified
range. Synchronization can be done by using the
external signal applied to the SYNC pin of the module as
shown in Fig. 45, with the converter being synchronized
by the rising edge of the external signal. The Electrical
Specifications table specifies the requirements of the
external SYNC signal. If the SYNC pin is not used, the
module should free run at the default switching
frequency. If synchronization is not being used,
connect the SYNC pin to GND.
MODULE
SYNC
+
ņ
GND
Figure 45. External source connections to
synchronize switching frequency of the module.
Measuring Output Current, Output Voltage and
Input Voltage
Please see the Digital Feature Descriptions section.
Dual Layout
Identical dimensions and pin layout of Analog and Digital
Pico DLynx modules permit migration from one to the
other without needing to change the layout. To support
this, 2 separate Trim Resistor locations have to be
provided in the layout. As shown in Fig. 46, for the digital
modules, the resistor is connected between the TRIM
pad and SGND and in the case of the analog module it
is connected between TRIM and GND.
MODULE TRIM
(PVX006 / PDT006)
SIG_GND
GND(Pin 7)
Rtrim1
for
Digital
Rtrim2
for
Analog
Caution –– For digital modules, do not connect
SIG_GND to GND elsewhere in the layout
Figure 46. Connections to support either Analog or
Digital PicoDLynx on the same layout.
Tunable Loop^TM
The module has a 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 Figure 38) 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 VS+ and TRIM pins of the module, as
shown in Fig. 47. This R-C allows the user to externally
adjust the voltage loop feedback compensation of the
module.
VOUT
VS+
MODULE
TRIM
SIG_GND
GND
RTune
CO
CTune
RTrim
Figure. 47. 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 and
3. Table 3 shows the recommended values of RTUNE and
CTUNE for different values of ceramic output capacitors
up to 1000uF that might be needed for an application to
meet output ripple and noise requirements. Selecting
RTUNE and CTUNE according to Table 3 will ensure stable
operation of the module.
In applications with tight output voltage limits in the
presence of dynamic current loading, additional output
capacitance will be required. 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 6A to 6A step change
(50% of full load), with an input voltage of 12V.
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.