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Moteur de recherche de fiches techniques de composants électroniques |
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Moteur de recherche de fiches techniques de composants électroniques |
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TPS5140 Fiches technique(PDF) 11 Page - Texas Instruments |
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TPS5140 Fiches technique(HTML) 11 Page - Texas Instruments |
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11 / 59 page  TPS5140 FOUR-CHANNEL DC/DC CONTROLLER FOR NOTEBOOK PC POWER SLVS305A – DECEMBER 2000 – REVISED JANUARY 2001 11 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 detailed description (continued) UVP (12-V boost converter) TPS5140 monitors output under voltage of the 12-V boost converter. When an output under voltage is detected, the timer starts to charge an external capacitor that is connected to the SCP terminal. After a programmable time delay, the SCP circuit forces all (CH1, 2, 3, and 12 V) MOSFETs drivers to latch off. SOFTSTART_12V An internal capacitor exists for 12-V soft start. If the soft start time needs to be extended, an external capacitor should be connected to this terminal. The12-V boost converter must start when REG5V_IN terminal is over 4.5 V. current limit of 12-V boost converter The 12-V boost current limit monitors the current flowing through the internal MOSFET. When the voltage drop across the internal N-channel MOSFET is high enough during its on time, the current limit circuit forces the internal N-channel MOSFET to turn off. PHASE_12V The 12-V boost converter does not typically require phase compensation. If there is reason to change the phase, the 12-V boost converter can be phase compensated by inserting external resistors and capacitors to GND. Otherwise, the PHASE_12V terminal should be left open. logic charts Table 1. Logic Chart1 STBY1 STBY2 STBY3 CH1 CH2 CH3 PGOUT L L L Disable Disable Disable N/A L L H Disable Disable Enable Active† L H L Disable Enable Disable Active† L H H Disable Enable Enable Active† H L L Enable Disable Disable Active† H L H Enable Disable Enable Active† H H L Enable Enable Disable Active† H H H Enable Enable Enable Active† † During softstart, PGOUT is active low. Table 2. Logic Chart2 STBY_VREF5 STBY_VREF3.3 VREF5‡ VREF3.3 L L N/A Disable H L Enable Disable L H Enable Enable H H Enable Enable ‡ To disable VREF5, all STBY1, 2, 3, STBY_VREF3.3 and STBY_VREF5 must be L. Table 3. Logic Chart3 STBY12V REG5V_IN 12 VOUT L L Disable L H Disable H L Disable H H Enable |
Numéro de pièce similaire - TPS5140 |
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Description similaire - TPS5140 |
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