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TPS53014 Fiches technique(PDF) 8 Page - Texas Instruments |
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TPS53014 Fiches technique(HTML) 8 Page - Texas Instruments |
8 / 20 page ( ) IN OUT OUT TRIP OCL SW IN DS(ON) V -V V V I = × + 2×L×f V R æ ö ç ÷ ç ÷ è ø TPS53014 SLVSBF1 – MAY 2012 www.ti.com OVER CURRENT PROTECTION TPS53014 has a cycle-by-cycle over current limit feature. The over current limits the inductor valley current by monitoring the voltage drop across the low-side MOSFET RDS(on) during the low-side driver on-time. If the inductor current is larger than the over current limit (OCL), the TPS53014 delays the start of the next switching cycle until the sensed inductor current falls below the OCL current. MOSFET RDS(on) current sensing is used to provide an accuracy and cost effective solution without external devices. To program the OCL, a resister should be connected between DRVL and PGND. The recommended values are given inTable 1. Table 1. OCL Resistor Values Resister Value ( k Ω) Vtrip (V) 6.8 0.050 11 0.087 18 0.125 27 0.174 39 0.224 56 0.274 75 0.336 IOCL is determined by Equation 3. (3) The trip voltage is set between 0.05V to 0.336V over all operational temperature, including the 4000ppm/°C temperature slope compensation for the temperature dependency of the RDS(on). If the load current exceeds the over-current limit, the voltage will begin to drop. If the over-current conditions continues the output voltage will fall below the under voltage protection threshold and the TPS53014 will shut down. OVER/UNDER VOLTAGE PROTECTION TPS53014 monitors a resistor divided feedback voltage to detect over and under voltage. If the feedback voltage is higher than 120% of the reference voltage, the OVP comparator output goes high and the circuit latches the high-side MOSFET driver OFF and the low-side MOSFET driver ON. When the feedback voltage is lower than 68% of the reference voltage, the UVP comparator output goes high and an internal UVP delay counter begins counting. After 1ms, TPS53014 latches OFF both top and bottom MOSFET drivers. This function is enabled approximately 1.7 x Tss after power-on. The OVP and UVP latch off is reset when EN goes low. UVLO PROTECTION TPS53014 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 device is shut off. All output drivers are OFF. The UVLO is non-latch protection. THERMAL SHUTDOWN TPS53014 monitors its temperature. If the temperature exceeds the threshold value (typically 150°C), the device shuts off. When the temperature falls below the threshold, the IC starts again. When VIN starts up and VREG5 output voltage is below its nominal value, the thermal shutdown threshold is kept lower than 150°C. As long as VIN rises, TJ must be kept less than 110°C. 8 Submit Documentation Feedback Copyright © 2012, Texas Instruments Incorporated Product Folder Link(s) :TPS53014 |
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