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TPS54302DDCR Datasheet(PDF) 10 Page - Texas Instruments |
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TPS54302DDCR Datasheet(HTML) 10 Page - Texas Instruments |
10 / 28 page out ref R2 V V 1 R3 é ù = ´ + ê ú ë û ( ) ENfalling STOP ENfalling p h R4 V R5 V V R4 I I ´ = - + + ENfalling START STOP ENri sin g ENfalling p h ENri sin g V V V V R4 V I 1 I V æ ö - ç ÷ ç ÷ è ø = æ ö - + ç ÷ ç ÷ è ø EN Ip Ih R4 R5 VIN Device 10 TPS54302 SLVSDG6A – MAY 2016 – REVISED MAY 2016 www.ti.com Product Folder Links: TPS54302 Submit Documentation Feedback Copyright © 2016, Texas Instruments Incorporated Feature Description (continued) Figure 13. Adjustable VIN Undervoltage Lockout (1) Where: Ip = 0.7 µA Ih = 1.55 µA VENfalling = 1.19 V VENrising = 1.22 V (2) 7.3.6 Safe Startup into Pre-Biased Outputs The device has been designed to prevent the low-side MOSFET from discharging a pre-biased output. During monotonic pre-biased startup, both high-side and low-side MOSFETs are not allowed to be turned on until the internal soft-start voltage is higher than FB pin voltage. 7.3.7 Voltage Reference The voltage reference system produces a precise ±2.5% voltage-reference over temperature by scaling the output of a temperature stable bandgap circuit. The typical voltage reference is designed at 0.596 V. 7.3.8 Adjusting Output Voltage The output voltage is set with a resistor divider from the output node to the FB pin. It is recommended to use divider resistors with 1% tolerance or better. Start with 100 k Ω for the upper resistor divider, use Equation 3 to calculate the output voltage. To improve efficiency at light loads consider using larger value resistors. If the values are too high the regulator is more susceptible to noise and voltage errors from the FB input current are noticeable. (3) 7.3.9 Internal Soft-Start The TPS54302 device uses the internal soft-start function. The internal soft start time is set to 5 ms typically. |
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