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L4978 Datasheet(PDF) 7 Page - STMicroelectronics |
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L4978 Datasheet(HTML) 7 Page - STMicroelectronics |
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7 / 12 page  0 5 10 15 20 25 30 35 40 45 50 VCC(V) 90.0 92.5 95.0 97.5 100.0 102.5 105.0 107.5 fsw (KHz) D97IN735 Tj=25 °C Figure 9. Switching Frequency vs. input voltage. 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 2.2 60 65 70 75 80 85 90 95 Io [A] η [%] Vcc=8V Vcc=12V Vcc=24V Vcc=48V Vo=3.36V fsw=100kHz Figure 14. Efficiency vs. output current. 0 5 10 15 20 25 30 80 82 84 86 88 90 92 94 96 98 Vo [V] η [%] fsw=100kHz fsw=200kHz Vcc=35V Io=2A Figure 12. Efficiency vs output voltage. 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 IO(A) 1.6 1.8 0.0 0.1 0.2 0.3 0.4 0.5 ∆V (V) 0.6 0.7 Tj=25 °C Tj=125 °C D98IN836 Tj=-25 °C Figure 11. Dropout voltage between pin 5 and 4. Vcc=12V Vcc=8V 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 2.2 60 65 70 75 80 85 90 95 Io [A] η [%] Vcc=8V Vcc=12V Vcc=24V Vcc=48V fsw=100kHz Vo=5.1V Figure 13. Efficiencyvs. output current. -50 0 50 100 Tj( °C) 90 95 100 105 fsw (KHz) D97IN785 Figure 10. Switching frequency vs. junction temperature. L4978 7/12 |
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