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STD Arkusz danych(PDF) 5 Page - Texas Instruments |
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STD Arkusz danych(HTML) 5 Page - Texas Instruments |
5 / 11 page www.ti.com 2.5 Efficiency 0 10 20 30 40 50 60 70 80 90 100 0.001 0.01 0.1 1 10 I -OutputCurrent- A O 3 3.6 4.2 5 TPS63000, PS=Low, V =3.3V O 2.6 Power Dissipation 2.7 Load Transients LOADI VOUT100mV/div Setup and Results Efficiency of over 90% is common at mid-to-high loads. With power-save mode enabled, efficiency is greater than 80% at light loads of 1 mA to 100 mA. Figure 4. Efficiency Over Li-Ion Cell Range With high efficiency, the power to be dissipated is low. Also, the QFN package with a solder pad is very efficient at removing heat. In this case, with unit delivering 3.3 V at 550 mA and 90% efficiency, power dissipation will be 180 mW. The package thermal resistance is about 50 °C/W, therefore the case-to-junction temperature rise would be 9 °C. This would allow an ambient temperatire of 116°C, and still hold the junction temperature below 125 °C. Load transient response is well regulated. Additional output capacitance reduces voltage over- and under-shoot. Figure 5. Load Step 100 mA to 500 mA SLVU156 – March 2006 TPS63000EVM-148 5 Submit Documentation Feedback |
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