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TPS62134DRGTT Datasheet(PDF) 10 Page - Texas Instruments |
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TPS62134DRGTT Datasheet(HTML) 10 Page - Texas Instruments |
10 / 27 page O S(PSM) 2 I O I on O 2 I ƒ V V V t V L ´ = - ´ ´ O on I V t 1 s V = m ´ TPS62134x C2 47 µF L1 1 µH SW VOS AGND PGND FBS C (LOAD) Load Ground Plane Connection TPS62134A, TPS62134B, TPS62134C, TPS62134D SLVSC20D – JANUARY 2015 – REVISED MAY 2015 www.ti.com 9.3.7 Single-Ended Remote Sense (FBS) The devices allow a single-ended remote sense by connecting the FBS pin at the load. This function overcomes the parasitic resistance of the PCB traces and achieves an improved output-voltage regulation at the load. Avoid any noise coupled into the FBS trace. Use a solid ground plane to connect the ground return of the load with the AGND and PGND pins of the device. Connect the AGND and PGND pins directly to exposed thermal pad of the device. Figure 3 shows an example. Figure 3. Remote Sense Connection 9.3.8 Thermal Shutdown The junction temperature (TJ) of the device is monitored by an internal temperature sensor. If TJ exceeds 160°C (typical), the device goes into thermal shutdown. Both the high-side and low-side power MOSFETs are turned off. When TJ decreases below the hysteresis of 20°C, the converter resumes normal operation, beginning with a soft start. 9.4 Device Functional Modes 9.4.1 PWM Operation and Power Save Mode The device operates with pulse width modulation (PWM) in medium and heavy load with a fixed on-time circuitry (ton). Use Equation 2 to calculate the on-time in steady-state operation. (2) The typical PWM switching frequency is 1 MHz. The frequency variation in PWM is controlled and depends on VI, VO, and the inductance. The switching frequency decreases with the input voltage to improve the efficiency in small duty-cycle applications. To maintain high efficiency at light loads, the device enters PSM at the boundary to discontinuous conduction mode (DCM). In PSM, the switching frequency decreases linearly with the load current maintaining high efficiency. Use Equation 3 to calculate the switching frequency in PSM mode. (3) See Figure 12 for the switching frequency variation over load and input voltage. 10 Submit Documentation Feedback Copyright © 2015, Texas Instruments Incorporated Product Folder Links: TPS62134A TPS62134B TPS62134C TPS62134D |
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