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TPS5431DDARG4 Fiches technique(PDF) 10 Page - Texas Instruments |
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TPS5431DDARG4 Fiches technique(HTML) 10 Page - Texas Instruments |
10 / 36 page VIN UVLO ENABLE Thermal Protection Reference Overcurrent Gate Drive Oscillator Ramp Generator VREF PH ENA GND BOOT Z1 Z2 SHDN SHDN SHDN SHDN SHDN SHDN SHDN SHDN VIN 112.5% VREF VSENSE OVP HICCUP HICCUP SHDN NC Feed Forward BOOT NC POWERPAD VIN VOUT 5 µA 1.221 V Bandgap Slow Start Boot Regulator Error Amplifier Gain = 25 PWM Comparator Protection Gate Driver Control VSENSE Copyright © Texas Instruments Incorporated 10 TPS5430, TPS5431 SLVS632I – JANUARY 2006 – REVISED APRIL 2017 www.ti.com Product Folder Links: TPS5430 TPS5431 Submit Documentation Feedback Copyright © 2006–2017, Texas Instruments Incorporated 7 Detailed Description 7.1 Overview The TPS543x is a 3-A, step-down (buck) regulator with an integrated high-side n-channel MOSFET. The TPS5431 is intended to operate from power rails up to 23 V and the TPS5430 up to 36 V. These devices implement constant-frequency voltage-mode control with voltage feed forward for improved line regulation and line transient response. Internal compensation reduces design complexity and external component count. The integrated 110-mΩ high-side MOSFET supports high-efficiency power-supply designs capable of delivering 3-A of continuous current to a load. The gate-drive bias voltage for the integrated high-side MOSFET is supplied by a bootstrap capacitor connected from the BOOT to PH pins. The TPS543x reduces the external component count by integrating the bootstrap recharge diode. The TPS543x has a default input start-up voltage of 5.3 V typical. The ENA pin can be used to disable the TPS543x reducing the supply current to 18 µA. An internal pullup current source enables operation when the ENA pin is floating. The TPS543x includes an internal slow-start circuit that slows the output rise time during start up to reduce in rush current and output voltage overshoot. The minimum output voltage is the internal 1.221-V feedback reference. Output overvoltage transients are minimized by an Overvoltage Protection (OVP) comparator. When the OVP comparator is activated, the high-side MOSFET is turned off and remains off until the output voltage is less than 112.5% of the desired output voltage. Internal cycle-by-cycle overcurrent protection limits the peak current in the integrated high-side MOSFET. For continuous overcurrent fault conditions the TPS543x will enter hiccup mode overcurrent limiting. Thermal protection protects the device from overheating. 7.2 Functional Block Diagram |
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