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TPS54325-Q1 Fiches technique(PDF) 7 Page - Texas Instruments |
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TPS54325-Q1 Fiches technique(HTML) 7 Page - Texas Instruments |
7 / 18 page 8 6 4 2 0 -50 0 50 100 150 T - Junction Temperature - °C J 0 200 400 600 800 1000 1200 -50 0 50 100 150 T - Junction Temperature - °C J TPS54325-Q1 www.ti.com SLVSAT1 – JUNE 2011 Current Protection The TPS54325-Q1 has cycle-by-cycle over current limiting control. The inductor current is monitored during the OFF state and the controller keeps the OFF state when the inductor current is larger than the over current trip level. In order to provide both good accuracy and cost effective solution, the device supports temperature compensated internal MOSFET RDS(on) sensing. The inductor current is monitored by the voltage between PGND pin and SW1/SW2 pin. In an over current condition, the current to the load exceeds the current to the output capacitor; thus the output voltage tends to fall off. Eventually, it will end up with crossing the under voltage protection threshold and shutdown. Over/Under Voltage Protection The TPS54325-Q1 monitors a resistor divided feedback voltage to detect over and under voltage. When the feedback voltage becomes higher than 120% of the target voltage, the OVP comparator output goes high and the circuit latches the high-side MOSFET driver turns off and the low-side MOSFET turns on. When the feedback voltage becomes lower than 70% of the target voltage, the UVP comparator output goes high and an internal UVP delay counter begins. After 250 μs, the device latches off both internal top and bottom MOSFET. This function is enabled approximately 1.7 x soft-start time. UVLO Protection The TPS54325-Q1 has under voltage lock out protection (UVLO) that monitors the voltage of VREG5 pin. When the VREG5 voltage is lower than UVLO threshold voltage, the TPS54325-Q1 is shut off. This is non-latch protection. Thermal Shutdown The TPS54325-Q1 monitors the temperature of itself. If the temperature exceeds the threshold value (typically 150 °C), the device is shut off. This is non-latch protection. TYPICAL CHARACTERISTICS Figure 1. VCC TEMPERATURE vs. JUNCTION Figure 2. VCC SHUTDOWN CURRENT vs. JUNCTION TEMPERATURE TEMPERATURE Copyright © 2011, Texas Instruments Incorporated 7 |
Numéro de pièce similaire - TPS54325-Q1 |
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Description similaire - TPS54325-Q1 |
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