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TLV62569 Datasheet(PDF) 7 Page - Texas Instruments |
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TLV62569 Datasheet(HTML) 7 Page - Texas Instruments |
7 / 24 page Control Logic Soft Start Thermal Shutdown UVLO Gate Drive GND FB EN SW Modulator TOFF GND Zero Current Detect Peak Current Detect + _ VREF VSW VIN + ± GND VPG VFB VIN PG Power Good feature is only available in TLV62569P Copyright Ú 2016, Texas Instruments Incorporated 7 TLV62569, TLV62569P www.ti.com SLVSDG1B – DECEMBER 2016 – REVISED JUNE 2017 Product Folder Links: TLV62569 TLV62569P Submit Documentation Feedback Copyright © 2016–2017, Texas Instruments Incorporated 7 Detailed Description 7.1 Overview The TLV62569 is a high-efficiency synchronous step-down converter. The device operates with an adaptive off time with peak current control scheme. The device operates at typically 1.5-MHz frequency pulse width modulation (PWM) at moderate to heavy load currents. Based on the VIN/VOUT ratio, a simple circuit sets the required off time for the low-side MOSFET. It makes the switching frequency relatively constant regardless of the variation of input voltage, output voltage, and load current. 7.2 Functional Block Diagrams Figure 4. TLV62569 Functional Block Diagram 7.3 Feature Description 7.3.1 Power Save Mode The device automatically enters Power Save Mode to improve efficiency at light load when the inductor current becomes discontinuous. In Power Save Mode, the converter reduces switching frequency and minimizes current consumption. In Power Save Mode, the output voltage rises slightly above the nominal output voltage. This effect is minimized by increasing the output capacitor. 7.3.2 100% Duty Cycle Low Dropout Operation The device offers a low input-to-output voltage differential by entering 100% duty cycle mode. In this mode, the high-side MOSFET switch is constantly turned on and the low-side MOSFET is switched off. The minimum input voltage to maintain output regulation, depending on the load current and output voltage, is calculated as: VIN(MIN) = VOUT + IOUT x (RDS(ON) + RL) where • RDS(ON) = High side FET on-resistance • RL = Inductor ohmic resistance (DCR) (1) |
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