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TPS62184 Datasheet(PDF) 7 Page - Texas Instruments |
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TPS62184 Datasheet(HTML) 7 Page - Texas Instruments |
7 / 32 page 1 1 3 1 3 3 1 7 SW1 SW2 FB VIN2 1 EN* SS/TR PG gate drive HS1 HS2 phase shift HS2 power control Power Save Mode HS1 gm VREF master follower PG control Thermal Shutdown UVLO control logic delay off-timer VIN tm tf gmout VO AEE TM VIN VIN 60 3 VIN1 VIN1 VIN2 GND *Pin is connected to a pull down resistor internally (see Feature Description section) HICCUP EN TPS62184 www.ti.com SLVSCQ5A – DECEMBER 2014 – REVISED FEBRUARY 2015 8 Detailed Description 8.1 Overview The TPS62184 is a high efficiency synchronous switched mode step-down converter based on a peak current control topology. It is designed for smallest solution size low-profile applications, converting multi-cell Li-Ion supply voltages to output voltages of 0.9 V to 3.5 V. While an outer voltage loop sets the regulation threshold for the current loop based on the actual VOUT level, the inner current loop adapts the peak inductor current for every switching cycle. The regulation network is internally compensated. The switching frequency is set by an OFF- time control and features Power Save Mode (PSM) and Automatic Efficiency Enhancement (AEE™) to keep the efficiency high over the whole load current and duty cycle range. The switching frequency is set depending on VIN and VOUT and remains unchanged for steady state operating conditions. The TPS62184 is a dual phase converter, sharing the load current among the phases. Identical in construction, the follower control loop is connected with a fixed delay to the master control loop. Both the phases use the same regulation threshold and cycle-by-cycle peak current setpoint. This ensures a phase-shifted as well as current-balanced operation. Using the advantages of the dual phase topology, a 6-A continuous output current is provided with high performance and smallest system solution size. 8.2 Functional Block Diagram Figure 6. TPS62184 Copyright © 2014–2015, Texas Instruments Incorporated Submit Documentation Feedback 7 Product Folder Links: TPS62184 |
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