APXS002A0X-SRZ Datasheet, PDF (12/24 Pages) General Semiconductor – 2A PicoTLynxTM: Non-Isolated DC-DC Power Modules 3Vdc –14Vdc input; 0.6Vdc to 5.5Vdc output; 2A Output Current

GE
2A PicoTLynx^TM: Non-Isolated DC-DC Power Modules
3Vdc –14Vdc input; 0.6Vdc to 5.5Vdc output; 2A Output Current
Data Sheet
Test Configurations
TO OSCILLOSCOPE
LTEST
1μH
CURRENT PROBE
VIN(+)
CS 1000μF
Electrolytic
E.S.R.<0.1Ω
@ 20°C 100kHz
CIN
2x100μF
Tantalum
COM
NOTE: Measure input reflected ripple current with a simulated
source inductance (LTEST) of 1μH. Capacitor CS offsets
possible battery impedance. Measure current as shown
above.
Figure 37. Input Reflected Ripple Current Test Setup.
COPPER STRIP
Vo+
0.1u F
10uF
RES IS TI VE
LOAD
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
res ista nc e.
Figure 38. Output Ripple and Noise Test Setup.
Rdistribution Rcontact
VIN(+)
VO
Rcontact Rdistribution
VIN
VO
RLOAD
Rdistribution Rcontact
COM COM
Rcontact Rdistribution
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 39. Output Voltage and Efficiency Test Setup.
Efficiency η =
VO. IO
VIN. IIN
x 100 %
Design Considerations
Input Filtering
The 12V PicoTLynx^TM 2A module 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
40 shows the input ripple voltage for various output
voltages at 2A of load current with 1x10 µF or 1x22 µF
ceramic capacitors and an input of 5V. Figure 41
shows the input ripple voltage for an input of 12V
90
80
70
1x10uF
60
1x22uF
50
40
30
20
0.5
1
1.5
2
2.5
3
3.5
Output Voltage (Vdc)
Figure 40. Input ripple voltage for various output
voltages with 1x10 µF or 1x22 µF ceramic capacitors
at the input (2A load). Input voltage is 5V.
110
100
90
80
1x10uF
70
1x22uF
60
50
40
30
20
0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
Output Voltage (Vdc)
Figure 41. Input ripple voltage for various output
voltages with 1x10 µF or 1x22 µF ceramic capacitors
at the input (2A load). Input voltage is 12V.
Output Filtering
The 12V PicoTLynx^TM 2A modules are designed for low
output ripple voltage and will meet the maximum output
ripple specification with 0.1 µF ceramic and 22µF ceramic
capacitors at the output of the module. However,
February 26, 2013
©2013 General Electric Company. All rights reserved.
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