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TPS62097RWKT Datasheet(PDF) 7 Page - Texas Instruments |
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TPS62097RWKT Datasheet(HTML) 7 Page - Texas Instruments |
7 / 28 page VOS FB PGND Output Discharge Logic 165Ω R2 (1) R1 (1) Direct Control and Compensation t Timer ON Comparator Ramp Error Amplifier iDCS - Control MOSFET Driver Control Logic High-side Current Sense Hiccup Counter SW PVIN EN Bandgap Undervoltage Lockout Thermal Shutdown EN PG V FB V REF V REF 375kΩ (2) Note: (1) R1, R2 are implemented in the fixed output voltage versions only. (2) When the device is enabled, the 375 k resistor is disconnected. SS/TR Voltage Clamp V IN V REF MODE On time Selection V IN AVIN AGND Low-side Current Sense TPS62097 www.ti.com SLVSCD6 – DECEMBER 2015 8 Detailed Description 8.1 Overview The TPS62097 synchronous step-down converter is based on the iDCS-Control (Industrial Direct Control with Seamless transition into Power Save Mode) topology. The control topology not only keeps the advantages of DCS-Control, but also provides other features: • Forced PWM mode over the whole load range • Selectable PWM switching frequency • 1% output voltage accuracy • Output voltage sequencing and tracking The iDCS-Control topology operates in PWM (Pulse Width Modulation) mode for medium to heavy load conditions and in Power Save Mode (PSM) at light load conditions. Or it forces the device in fixed frequency PWM mode only operation for the whole load range. In PWM mode, the device operates with a predictive On-time switching pulse. A quasi-fixed switching frequency over the input and output voltage range is achieved by using an input and output voltage feed forward to set the on-time, as shown in Table 1. The converter enters Power Save Mode, reducing the switching frequency and minimizing current consumption, to achieve high efficiency over the entire load current range. Since iDCS-Control supports both operation modes within a single building block, the transition from PWM mode to Power Save Mode is seamless and without effects on the output voltage. 8.2 Functional Block Diagram Copyright © 2015, Texas Instruments Incorporated Submit Documentation Feedback 7 Product Folder Links: TPS62097 |
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