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TPS62097 Datasheet(PDF) 10 Page - Texas Instruments |
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TPS62097 Datasheet(HTML) 10 Page - Texas Instruments |
10 / 28 page Voltage t V OUT1 V OUT2 Voltage t V OUT1 V OUT2 a) Ratiometric Tracking b) Coincidental Tracking 2 R 1 R 4 R 3 R < 2 R 1 R 4 R 3 R = R2 V OUT1 R1 TPS62097 V OUT2 R4 R3 SS/TR FB A 5 . 7 V 8 . 0 C t TR / SS SS m ´ = TPS62097 SLVSCD6 – DECEMBER 2015 www.ti.com 8.4.3 Soft Startup (SS/TR) The TPS62097 programs its output voltage ramp rate with the SS/TR pin. Connecting an external capacitor to SS/TR enables output soft startup to reduce inrush current from the input supply. The device charges the capacitor voltage to the input supply voltage with a constant current of typically 7.5 μA. The FB pin voltage follows the SS/TR pin voltage until the internal reference voltage of 0.8V is reached. The soft startup time is calculated using Equation 3. Keep the SS/TR pin floating to set the minimum startup time. (3) An active pull-down circuit is connected to the SS/TR pin. It discharges the external soft startup capacitor in case of disable, UVLO, thermal shutdown and HICCUP short circuit protection. 8.4.4 Voltage Tracking (SS/TR) The SS/TR pin is externally driven by another voltage source to achieve output voltage tracking. The application circuit is shown in Figure 4. From 0 V to 0.8 V, the internal reference voltage to the internal error amplifier follows the SS/TR pin voltage. When the SS/TR pin voltage is above 0.8 V, the voltage tracking is disabled and the FB pin voltage is regulated at 0.8 V. The device achieves ratiometric or coincidental (simultaneous) output tracking, as shown in Figure 5. Figure 4. Output Voltage Tracking Figure 5. Voltage Tracking Options The R2 value should be set properly to achieve accurate voltage tracking by taking 7.5 µA soft startup current into account. 1 k Ω or smaller is a sufficient value for R2. For decreasing SS/TR pin voltage, the device doesn't sink current from the output when the device is in PSM. So the resulting decreases of the output voltage may be slower than the SS/TR pin voltage if the load is light. When driving the SS/TR pin with an external voltage, do not exceed the voltage rating of the SS/TR pin which is VIN+0.3V. 10 Submit Documentation Feedback Copyright © 2015, Texas Instruments Incorporated Product Folder Links: TPS62097 |
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