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TPS62162-Q1 Datasheet(PDF) 8 Page - Texas Instruments |
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TPS62162-Q1 Datasheet(HTML) 8 Page - Texas Instruments |
8 / 34 page control logic Soft start Thermal Shtdwn UVLO PG control power control error amplifier gate drive HS lim LS lim VIN PG PGND AGND comp comp + _ timer tON DCS - Control TM direct control & compensation comparator ramp SW EN * VOS FB * * This pin is connected to a pull down resistor internally (see Detailed Description section). Copyright ã 2016, Texas Instruments Incorporated 8 TPS62160-Q1, TPS62162-Q1 SLVSCK6A – DECEMBER 2014 – REVISED NOVEMBER 2016 www.ti.com Product Folder Links: TPS62160-Q1 TPS62162-Q1 Submit Documentation Feedback Copyright © 2014–2016, Texas Instruments Incorporated Functional Block Diagram (continued) Figure 6. TPS62162-Q1 (Fixed Output Voltage) 9.3 Feature Description 9.3.1 Enable / Shutdown (EN) When Enable (EN) is set High, the device starts operation. Shutdown is forced if EN is pulled Low with a shutdown current of typically 1.8 µA. During shutdown, the internal power MOSFETs as well as the entire control circuitry are turned off. The internal resistive divider pulls down the output voltage smoothly. If the EN pin is Low, an internal pull-down resistor of about 400 kΩ is connected and keeps it Low in case of floating pin. Connecting the EN pin to an appropriate output signal of another power rail provides sequencing of multiple power rails. 9.3.2 Softstart The internal soft start circuitry controls the output voltage slope during startup. This avoids excessive inrush current and ensures a controlled output voltage rise time. It also prevents unwanted voltage drops from high- impedance power sources or batteries. When EN is set to start device operation, the device starts switching after a delay of about 50 µs and VOUT rises with a slope of about 25 mV/µs. See Figure 28 and Figure 29 for typical startup operation. |
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