Data Sheet
October 8, 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
Test Configurations
TO OSCILLOSCOPE
L
TEST
1μH
V
IN
(+)
CURRENT PROBE
Design Considerations
Input Filtering
The Pico TLynx
TM
6A modules should be connected
to a low ac-impedance source. A highly inductive
source can affect the stability of the module. An input
capacitance must be placed directly adjacent to the
input pin of the module, to minimize input ripple
voltage and ensure module stability.
To minimize input voltage ripple, ceramic capacitors are
recommended at the input of the module. Figure 34
shows the input ripple voltage for various output
voltages at 6A of load current with 1x22 µF or 2x22 µF
ceramic capacitors and an input of 5V. Figure 35 shows
data for the 3.3Vin case, with 1x22µF or 2x22µF of
ceramic capacitors at the input.
120
BATTERY
C
S
1000μF
Electrolytic
E.S.R.<0.1Ω
@ 20°C 100kHz
C
IN
2x100μF
Tantalum
COM
NOTE: Measure input reflected ripple current with a simulated
source inductance (L
TEST
) of 1μH. Capacitor C
S
offsets
possible battery impedance. Measure current as shown
above.
Input Ripple Voltage (mVp-p)
Figure 31. Input Reflected Ripple Current Test
Setup.
COPPER STRIP
RESISTIVE
LOAD
0.1uF
COM
SCOPE USING
BNC SOCKET
GROUND PLANE
NOTE: All voltage measurements to be taken at the module
terminals, as shown above. If sockets are used then
Kelvin connections are required at the module terminals
to avoid measurement errors due to socket contact
resistance.
10uF
100
80
60
40
20
0
0.5
1
1.5
2
2.5
3
3.5
1x22uF
2x22uF
Vo+
Figure 32. Output Ripple and Noise Test Setup.
Output Voltage (Vdc)
Figure 34. Input ripple voltage for various output
voltages with 1x22 µF or 2x22 µF ceramic
capacitors at the input (6A load). Input voltage is 5V.
120
R
distribution
R
contact
V
IN
(+)
V
O
R
contact
R
distribution
Input Ripple Voltage (mVp-p)
100
80
60
40
1x22uF
20
0
0.5
1
1.5
2
2.5
3
2x22uF
V
IN
V
O
R
LOAD
R
distribution
R
contact
COM
COM
R
contact
R
distribution
NOTE: All voltage measurements to be taken at the module
terminals, as shown above. If sockets are used then
Kelvin connections are required at the module terminals
to avoid measurement errors due to socket contact
resistance.
Figure 33. Output Voltage and Efficiency Test Setup.
V
O
. I
O
Efficiency
η
=
V
IN
. I
IN
x
100 %
Output Voltage (Vdc)
Figure 35. Input ripple voltage in mV, p-p for
various output voltages with 1x22 µF or 2x22 µF
ceramic capacitors at the input (6A load). Input
voltage is 3.3V.
LINEAGE
POWER
11
LINEAGEPOWER [ LINEAGE POWER CORPORATION ]
