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TPS54325-Q1 Fiches technique(PDF) 7 Page - Texas Instruments

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No de pièce TPS54325-Q1
Description  4.5-V to 18-V, 3-A OUTPUT SYNCHRONOUS STEP DOWN SWITCHER WITH INTEGRATED FET ( SWIFT??
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Fabricant  TI1 [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI1 - Texas Instruments

TPS54325-Q1 Fiches technique(HTML) 7 Page - Texas Instruments

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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


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