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TPS5430 Datasheet(PDF) 7 Page - Texas Instruments |
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TPS5430 Datasheet(HTML) 7 Page - Texas Instruments |
7 / 22 page www.ti.com APPLICATION INFORMATION FUNCTIONAL BLOCK DIAGRAM VIN UVLO ENABLE Thermal Protection Reference Overcurrent Gate Drive Oscillator Ramp Generator VREF PH ENA GND SHDN SHDN BOOT Z1 Z2 SHDN SHDN SHDN SHDN VIN SHDN HICCUP HICCUP SHDN SHDN NC Feed Forward BOOT NC POWERPAD VIN VOUT TPS5430 5 µA 1.221 V Bandgap Slow Start Boot Regulator Error Amplifier Gain = 25 PWM Comparator Protection Gate Driver Control VSENSE DETAILED DESCRIPTION Oscillator Frequency Voltage Reference Enable (ENA) and Internal Slow Start TPS5430 SLVS632 – JANUARY 2006 The internal free running oscillator sets the PWM switching frequency at 500 kHz. The 500 kHz switching frequency allows less output inductance for the same output ripple requirement resulting in a smaller output inductor. The voltage reference system produces a precision reference signal by scaling the output of a temperature stable bandgap circuit. The bandgap and scaling circuits are trimmed during production testing to an output of 1.221 V at room temperature. The ENA pin provides electrical on/off control of the regulator. Once the ENA pin voltage exceeds the threshold voltage, the regulator starts operation and the internal slow start begins to ramp. If the ENA pin voltage is pulled below the threshold voltage, the regulator stops switching and the internal slow start resets. Connecting the pin to ground or to any voltage less than 0.5 V will disable the regulator and activate the shutdown mode. The quiescent current of the TPS5430 in shutdown mode is typically 18 µA. The ENA pin has an internal pullup current source, allowing the user to float the ENA pin. If an application requires controlling the ENA pin, use open drain or open collector output logic to interface with the pin. To limit the start-up inrush current, an internal slow start circuit is used to ramp up the reference voltage from 0 V to its final value linearly. The internal slow start time is 8ms typically. 7 |
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