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TPS62152RGTR Datasheet(PDF) 9 Page - Texas Instruments |
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TPS62152RGTR Datasheet(HTML) 9 Page - Texas Instruments |
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9 / 43 page  control logic Soft start Thermal Shtdwn UVLO PG control power control error amplifier gate drive HS lim LS lim PVIN PVIN AVIN PG PGND PGND AGND comp comp + _ timer tON DCS - Control TM direct control & compensation comparator ramp SW SW SW EN * SS/TR DEF * FSW * VOS FB * Copyright © 2016, Texas Instruments Incorporated 9 TPS62150, TPS62150A, TPS62151, TPS62152, TPS62153 www.ti.com SLVSAL5D – NOVEMBER 2011 – REVISED SEPTEMBER 2016 Product Folder Links: TPS62150 TPS62150A TPS62151 TPS62152 TPS62153 Submit Documentation Feedback Copyright © 2011–2016, Texas Instruments Incorporated Functional Block Diagrams (continued) * This pin is connected to a pull down resistor internally (see Feature Description section) Figure 6. TPS62151, -2, -3 (Fixed Output Voltage) space 8.3 Feature Description 8.3.1 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 1.5µA. 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. The EN signal must be set externally to High or Low. An internal pull-down resistor of about 400kΩ is connected and keeps EN logic low, if Low is set initially and then the pin gets floating. It is disconnected if the pin is set High Connecting the EN pin to an appropriate output signal of another power rail provides sequencing of multiple power rails. 8.3.2 Soft-Start or Tracking (SS/TR) The internal soft-start circuitry controls the output voltage slope during start-up. 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 controlled by an external capacitor connected to the SS/TR pin. See Figure 40 and Figure 41 for typical start-up operation. |
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