Data Sheet
Pico TLynxTM 6A: Non-isolated DC-DC Power Modules
May 20, 2009
2.4 – 5.5Vdc input; 0.6Vdc to 3.63Vdc output; 6A output current
Output Filtering
20
The Pico TLynxTM 6A modules are designed for low
output ripple voltage and will meet the maximum output
ripple specification with 0.11 µF ceramic and 10 µF
ceramic capacitors at the output of the module.
However, additional output filtering may be required by
the system designer for a number of reasons. First,
there may be a need to further reduce the output ripple
15
10
5
1x10uF External Cap
1x47uF External Cap
2x47uF External Cap
4x47uF External Cap
and noise of the module.
Second, the dynamic
response characteristics may need to be customized to
a particular load step change.
0
To reduce the output ripple and improve the dynamic
response to a step load change, additional capacitance
at the output can be used. Low ESR polymer and
ceramic capacitors are recommended to improve the
dynamic response of the module. Figure 36 provides
output ripple information for different external
capacitance values at various Vo and for load currents
of 6A while maintaining an input voltage of 5V. Fig 37
shows the performance with a 3.3V input. For stable
operation of the module, limit the capacitance to less
than the maximum output capacitance as specified in
the electrical specification table. Optimal performance
of the module can be achieved by using the Tunable
LoopTM feature described later in this data sheet.
0.5
1
1.5
2
2.5
3
Output Voltage(Volts)
Figure 37. Output ripple voltage for various output
voltages with external 1x10 µF, 1x47 µF, 2x47 µF or
4x47 µF ceramic capacitors at the output (6A load).
Input voltage is 3.3V.
Safety Considerations
For safety agency approval the power module must be
installed in compliance with the spacing and separation
requirements of the end-use safety agency standards,
i.e., UL 60950-1, CSA C22.2 No. 60950-1-03, and VDE
0850:2001-12 (EN60950-1) Licensed.
25
20
For the converter output to be considered meeting the
requirements of safety extra-low voltage (SELV), the
input must meet SELV requirements. The power
module has extra-low voltage (ELV) outputs when all
inputs are ELV.
1x10uF External Cap
1x47uF External Cap
2x47uF External Cap
4x47uF External Cap
15
10
5
The input to these units is to be provided with a fast-
acting fuse with a maximum rating of 6A in the positive
input lead.
0
0.5
1
1.5
2
2.5
3
3.5
Output Voltage(Volts)
Figure 36. Output ripple voltage for various output
voltages with external 1x10 µF, 1x47 µF, 2x47 µF or
4x47 µF ceramic capacitors at the output (6A load).
Input voltage is 5V.
LINEAGE POWER
12
LINEAGEPOWER [ LINEAGE POWER CORPORATION ]
