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TPS61230ARNST Datasheet(PDF) 8 Page - Texas Instruments |
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TPS61230ARNST Datasheet(HTML) 8 Page - Texas Instruments |
8 / 28 page Thermal Shutdown UVLO Gate Driver Pulse Modulator Soft Start Control OVP & Short Protection 3 5 4 Logic 2 VOUT VOUT VIN SW EN FB VOUT VIN 6 GND REF Current Sense 1 CBST OFF ON CIN VIN L COUT 7 R1 R2 VOUT Copyright © 2016, Texas Instruments Incorporated 8 TPS61230A SLVSCZ5A – JULY 2016 – REVISED AUGUST 2016 www.ti.com Product Folder Links: TPS61230A Submit Documentation Feedback Copyright © 2016, Texas Instruments Incorporated 8 Detailed Description 8.1 Overview The TPS61230A is a high efficiency synchronous boost converter with integrating the 21-m Ω low side FET and 18-m Ω high side FET. The device could deliver up to 12-W output power with 5.5-V maximum output voltage from single cell Li-Iron battery. TPS61230A uses a quasi constant on-time valley current mode which provides an excellent transient response. The TPS61230xA typically operates at a quasi-constant 1.15-MHz frequency pulse width modulation (PWM) at the moderate to heavy load currents, allows the use of small inductor and capacitors to achieve a compact solution size. During the PWM operation, a simple circuit predicts the required on time (with the VIN / VOUT ratio) of the ow- side FET. At the beginning of each switching cycle, the low-side FET turns on and the inductor current ramps up to the peak current determined by the on-time and the inductance. Once the on-timer expires, the high-side FET turns on and the inductor current decays to a preset valley current threshold determined by the Error Amplifier’s output. The switching cycle repeats again by calculating the on time and activating the low-side FET. At the light load currents, TPS61230A operates in Power Save Mode with pulse frequency modulation (PFM) and improves the efficiency under the light load. Internal soft-start and loop compensation simplifies the design process and minimizes the number of external components. 8.2 Functional Block Diagram |
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