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TPSM82480MOPR Datasheet(PDF) 10 Page - Texas Instruments |
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TPSM82480MOPR Datasheet(HTML) 10 Page - Texas Instruments |
10 / 31 page ] Hz [ f % 100 ns 70 DC SW min × × = ( ) IN 2 PEAK OUT IN OUT OUT ) PSM ( SW V I L V V V I 2 f × × - × × = 10 TPSM82480 SLVSDT1 – JULY 2017 www.ti.com Product Folder Links: TPSM82480 Submit Documentation Feedback Copyright © 2017, Texas Instruments Incorporated Feature Description (continued) 7.3.8 Active Output Discharge The VO pin, connected to the output voltage, provides an active discharge path when the device is switched off by setting EN Low or UVLO event. In case of being activated, this discharge circuit sinks typically 120mA for output voltages of typically 1 V and above. If VOUT is lower, the active current sink enters linear operation mode and the discharge current decreases. 7.3.9 Undervoltage Lockout (UVLO) The undervoltage lockout prevents misoperation of the device, if the input voltage drops below the UVLO threshold which is set to typically 2.3 V. The converter starts operation again once the input voltage exceeds the threshold by a hysteresis of typically 200 mV. 7.3.10 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 in thermal shutdown with a hysteresis of about 10°C. Both the power FETs are turned off and the PG pin goes Low. Once TJ has decreased enough, the device resumes normal operation with Soft Start. 7.4 Device Functional Modes 7.4.1 Pulse Width Modulation (PWM) Operation The TPSM82480 is based on a predictive OFF-time peak current control topology, operating with PWM in continuous conduction mode for heavier loads. The switching frequency is typically 2.2MHz. Both the master and follower phase regulate to the same VOUT level, each with a separate current loop, using the same peak current set point, cycle by cycle. This provides excellent peak current balancing, independent of inductor dc resistance matching. Since the follower phase operates with an adaptive delay to the master phase, phase shifted operation is always obtained. If the load current decreases, the device runs with the master phase only (see Phase Add/Shed and Current Balancing). PWM only mode can be forced by pulling MODE pin High. If MODE is set Low, the device features an automatic transition into Power Save Mode, entered at light loads, running in discontinuous conduction mode (DCM). 7.4.2 Power Save Mode (PSM) Operation As the load current decreases to half the ripple current, the converter enters Power Save Mode operation. During PSM, the converter operates with reduced switching frequency maintaining high conversion efficiency. Power Save Mode is based on an adaptive peak current target, to keep output voltage ripple low. Since each pulse shifts VOUT up, a pause time happens until VOUT trips the internal VOUT_Low threshold again and the next pulse takes place. The switching frequency in PSM (one phase operation) calculates as: space (1) 7.4.3 Minimum Duty Cycle and 100% Mode Operation The minimum on-time, which is typically 70ns, normally determines a limit on the minimum operating duty cycle. The calculation is: space (2) space However, a frequency foldback lowers the switching frequency depending on the duty cycle and ensures proper regulation for every duty cycle. |
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