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APXH003A0X-SRZ_0910 Datasheet(PDF) 11 Page - Lineage Power Corporation |
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APXH003A0X-SRZ_0910 Datasheet(HTML) 11 Page - Lineage Power Corporation |
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11 / 23 page  Data Sheet October 8, 2009 Pico TLynxTM 3A: Non-isolated DC-DC Power Modules 2.4 – 5.5Vdc input; 0.6Vdc to 3.63Vdc output; 3A output current LINEAGE POWER 11 Test Configurations TO OSCILLOSCOPE CURRENT PROBE LTEST 1μH CS 1000μF Electrolytic E.S.R.<0.1 Ω @ 20°C 100kHz 2x100μF Tantalum VIN(+) 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. CIN Figure 31. Input Reflected Ripple Current Test Setup. 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. Vo+ COM 0.1uF RESISTIVE LOAD SCOPE USING BNC SOCKET COPPER STRIP GROUND PLANE 10uF Figure 32. Output Ripple and Noise Test Setup. VO COM VIN(+) COM RLOAD Rcontact Rdistribution Rcontact Rdistribution Rcontact Rcontact Rdistribution Rdistribution VIN VO 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. η = VO. IO VIN. IIN x 100 % Efficiency Design Considerations Input Filtering The Pico TLynx TM 3A 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, low-ESR ceramic capacitors are recommended at the input of the module. Figure 34 shows the input ripple voltage for various output voltages at 3A 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. 0 10 20 30 40 50 60 0.51 1.52 2.5 3 3.5 1x22uF 2x22uF Output Voltage (Vdc) Figure 34. Input ripple voltage for various output voltages with 1x22 µF or 2x22 µF ceramic capacitors at the input (3A load). Input voltage is 5V. 0 10 20 30 40 50 60 0.51 1.522.5 3 1x22uF 2x22uF 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 (3A load). Input voltage is 3.3V. |
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