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TPS53124RGET Datasheet(PDF) 10 Page - Texas Instruments |
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TPS53124RGET Datasheet(HTML) 10 Page - Texas Instruments |
10 / 22 page Current Protection 10 TRIP TRIP V ( mV ) R ( k ) ( A ) m = W ´ (1) 1 2 2 IN OUT OUT TRIP RIPPLE TRIP OCP DS ( on ) DS ( on ) IN (V V ) V V I V I R R L f V - ´ = + = + ´ ´ ´ (2) Over/Under Voltage Protection UVLO Protection Thermal Shutdown TPS53124 SLUS825B – FEBRUARY 2008 – REVISED MAY 2008 ..................................................................................................................................................... www.ti.com TPS53124 has cycle-by-cycle over current limiting control. The inductor current is monitored during the ‘OFF’ state and the controller keeps the OFF state during the inductor current is larger than the over-current trip level. In order to provide both good accuracy and cost effective solution, TPS53124 supports temperature compensated MOSFET RDS(on) sensing. TRIPx pin should be connected to GND through the trip voltage setting resistor, RTRIP. TRIPx terminal sources 10-µA ITRIP current at the ambient temperature and the trip level is set to the OCL trip voltage VTRIP as below: The trip level should be in the range of 30 mV to 200 mV over all operational temperature. The inductor current is monitored by the voltage between PGNDx pin and LLx pin. ITRIP has 4000ppm/°C temperature slope to compensate the temperature dependency of the RDS(on). PGNDx is used as the positive current sensing node so that PGNDx should be connected to the source terminal of the bottom MOSFET. As the comparison is done during the OFF state, VTRIP sets valley level of the inductor current. Thus, the load current at over-current threshold, IOCP, can be calculated as follows: 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. TPS53124 monitors a resistor divided feedback voltage to detect over and under voltage. When the feedback voltage becomes higher than 115% of the target voltage, the OVP comparator output goes high and the circuit latches as the high-side MOSFET driver OFF and the low-side MOSFET driver 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 counting. After 30 µs, TPS53124 latches OFF both top and bottom MOSFET drivers, and shut off both drivers of another channel. This function is enabled approximately 2.0 ms. TPS53124 has V5FILT Under Voltage Lock Out protection (UVLO). When the V5FILT voltage is lower than UVLO threshold voltage TPS53124 is shut off. This is non-latch protection. TPS53124 monitors the temperature of itself. If the temperature exceeds the threshold value (typically 150 °C), the switchers will be shut off as both DRVH and DRVL at low, the output discharge function enabled. Then TPS53124 is shut off. This is non-latch protection. 10 Submit Documentation Feedback Copyright © 2008, Texas Instruments Incorporated Product Folder Link(s): TPS53124 |
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