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TPS82085SILT Datasheet(PDF) 7 Page - Texas Instruments |
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TPS82085SILT Datasheet(HTML) 7 Page - Texas Instruments |
7 / 25 page L V V t I OUT IN ON L - ´ = D IN OUT ON V V ns 420 t ´ = VOUT FB GND Output Discharge Logic 260Ω Direct Control and Compensation Timer ton Comparator Ramp Error Amplifier DCS - Control TM MOSFET Driver Control Logic High Side Current Sense Hiccup Counter VIN EN Bandgap Undervoltage Lockout Thermal Shutdown EN PG V FB V REF V REF 400kΩ (1) Note: (1) When the device is enabled, the 400 k resistor is disconnected. (2) The integrated inductor in the module, L = 0.47µH. L (2) TPS82085 www.ti.com SLVSCN4B – OCTOBER 2014 – REVISED AUGUST 2015 7 Detailed Description 7.1 Overview The TPS82085 synchronous step-down converter power module is based on DCS-Control™ (Direct Control with Seamless transition into Power Save Mode). This is an advanced regulation topology that combines the advantages of hysteretic, voltage and current mode control. The DCS-Control™ topology operates in PWM (Pulse Width Modulation) mode for medium to heavy load conditions and in PSM (Power Save Mode) at light load currents. In PWM, the converter operates with its nominal switching frequency of 2.4 MHz having a controlled frequency variation over the input voltage range. As the load current decreases, the converter enters Power Save Mode, reducing the switching frequency and minimizing the IC's quiescent current to achieve high efficiency over the entire load current range. DCS-Control™ supports both operation modes using a single building block and therefore has a seamless transition from PWM to PSM without effects on the output voltage. The TPS82085 offers excellent DC voltage regulation and load transient regulation, combined with low output voltage ripple, minimizing interference with RF circuits. 7.2 Functional Block Diagram 7.3 Feature Description 7.3.1 PWM and PSM Operation The TPS82085 includes a fixed on-time (tON) circuitry. This tON, in steady-state operation in PWM and PSM modes, is estimated as: (1) In PWM mode, the TPS82085 operates with pulse width modulation in continuous conduction mode (CCM) with a tON shown in Equation 1 at medium and heavy load currents. A PWM switching frequency of typically 2.4 MHz is achieved by this tON circuitry. The device operates in PWM mode as long as the output current is higher than half the inductor's ripple current estimated by Equation 2. (2) To maintain high efficiency at light loads, the device enters Power Save Mode seamlessly when the load current decreases. This happens when the load current becomes smaller than half the inductor's ripple current. In PSM, the converter operates with a reduced switching frequency and with a minimum quiescent current to maintain high efficiency. The on time in PSM is also based on the same tON circuitry. The switching frequency in PSM is estimated as: Copyright © 2014–2015, Texas Instruments Incorporated Submit Documentation Feedback 7 Product Folder Links: TPS82085 |
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