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TPS8268105SIPR Fiches technique(PDF) 10 Page - Texas Instruments |
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TPS8268105SIPR Fiches technique(HTML) 10 Page - Texas Instruments |
10 / 32 page Gate Driver Anti Shoot-Through Timing Generator Feedback Divider + - SSFM R1 R2 L GND Soft-Start EN VIN Current Sense Undervoltage Lockout Bias Supply Bandgap Thermal Shutdown Negative Inductor Current Detect VIN MODE V = 0.8 V REF V REF C I C O VOUT DC/DC CONVERTER V OUT V IN TPS8268180, TPS8268150, TPS8268120, TPS8268105, TPS8268090 SLVSBR0C – OCTOBER 2014 – REVISED JUNE 2015 www.ti.com 8 Detailed Description 8.1 Overview The TPS8268x is a complete DC/DC step-down power supply intended for small size and low profile applications. Included in the package are the switching regulator, inductor and input/output capacitors. It is a complete Plug & Play Solution, meaning typically no additional components are required to finish the design. Integration of all required passive components enables a tiny solution size of only 6.7mm2. The converter operates with fixed frequency pulse width modulation (PWM). The TPS8268x integrates an input current limit to protect the device against heavy load or short circuits and features an undervoltage lockout circuit to prevent the device from misoperation at low input voltages. 8.2 Functional Block Diagram 8.3 Feature Description 8.3.1 Soft Start The TPS8268x has an internal soft start circuit that controls the ramp up of the output voltage. Once the converter is enabled and the input voltage is above the undervoltage lockout threshold VUVLO, the output voltage ramps up to 95% of its nominal value within tRamp of typ. 150μs. This ensures a controlled ramp up of the output voltage and limits the input voltage drop when a battery or a high-impedance power source is connected to the input of the DC/DC converter. The inrush current during start-up is directly related to the effective capacitance and load present at the output of the converter. 10 Submit Documentation Feedback Copyright © 2014–2015, Texas Instruments Incorporated Product Folder Links: TPS8268180 TPS8268150 TPS8268120 TPS8268105 TPS8268090 |
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