How to reduce current spikes at AC zero-crossing for totem-pole PFC
Texas InstrumentsPower factor correction (PFC) is widely used in AC/DC power supplies with an input power of 75 watts or greater. PFC forces the input current to follow the input voltage so that any electrical load appears like a resistor. Amongst all the different PFC topologies, the totem-pole PFC has recently received more attention because it uses the least number of components, has the smallest conduction loss, and has the highest efficiency. Typically, a totem-pole PFC cannot operate in continuous-conduction mode (CCM) because of the slow reverse recovery of the MOSFET’s body diodes. However, with the advent of the galliumnitride (GaN) FET, its diode-free structure makes the CCM totem-pole PFC possible.
Theory & Implemention of Digital Cellular Std Voice Coder: VSELP on TMS320C5x
Texas InstrumentsTHEORY AND IMPLEMENTATION OF THE DIGITAL CELLULAR STANDARD VOICE CODER: VSELP ON THE TMS320C5X
Using Dual Current Limited TPS2140/41/50/51 For USB & Portable Applications
Texas InstrumentsUsing Dual Current Limited TPS2140/41/50/51For USB and Portable Applications
Practical Technique for Minimizing the Number of Measurements in Sensor Signal
Texas InstrumentsThe output of many modern bridge type sensors contains errors that must be eliminated through calibration. One major source of error is variation of sensor span and offset from device to device and their respective drifts with temperature. These drifts can be non-linear. Another source of error is the nonlinearity of the sensor output with applied stimulus. Signal conditioning electronics can also
Adaptive Frequency Hopping and Other Co-Existence Mechanisms for CC85xx
Texas InstrumentsThis application report provides operational details of the RF System that are used in the PurePath Wireless family of devices (CC85xx).
AN-1066 Low Cost Boost Converters Using LM3578A (Rev. B)
Texas InstrumentsThe LM3578A integrated circuit is a switching regulator with all the power control and protection features.It operates over a wide input voltage range. This together with its low-cost makes it a very popular choicefor use in switching regulators. This application report presents several low-cost boost converter circuitsdeveloped using the LM3578A switching regulator. The operation and the
Programmable Yn Clock Phase Shift w/SN74SSQEA32882 DDR3 Register
Texas InstrumentsThis application report describes how to shift the Yn clock position on TI’s DDR3 register SN74SSQEA32882 (V4.2) by using extended CMR commands. This Yn clock position shift can be used for the analysis of post register margin at the DRAMs. Note that this application report does not apply to SN74SSQE32882 (V3.1).
Thermocouple Measurements with ΔΣ ADCs
Texas InstrumentsThermocouple Measurements with ΔΣ ADCs
Interfacing the TLC32040 Family to the TMS320 Family (Rev. A)
Texas InstrumentsINTERFACING THE TLC32040 FAMILY TO THE TMS320 FAMILY APPLICATION REPORT
Multi-Frequency Range and Tunable DCO on MSP432P4xx Microcontrollers
Texas InstrumentsMulti-Frequency Range and Tunable DCO on MSP432P4xx Microcontrollers
DAC348x Device Configuration and Synchronization
Texas InstrumentsDAC3484, DAC3482, DAC34H84, DAC34SH84, DAC3282, DAC3283, DAC3174 DAC348x Device Configuration and Synchronization
Using the TMS320VC5506/C5507/C5509/C5509A USB Bootloader (Rev. C)
Texas InstrumentsBootloading the TMS320VC5506/C5507/C5509/C5509A digital signal processor (DSP) through the on-chip universal serial bus (USB) peripheral is part of the standard bootloader provided on the device. This document describes the procedures for physically connecting the DSP to a USB host invoking the USB bootloader on the DSP generating the correct boot table file and downloading the boot table from
Selecting the Best bq2425x Single Cell I2C, Standalone Switch-Mode Battery Charg
Texas Instrumentsbq24250, bq24251, bq24253, bq24253H, bq24257, bq24258 Selecting the Best bq2425x Single Cell I2C, Standalone Switch-Mode Battery Charger PMP/BMS/Battery_Charge/2-App_Reports/SLUA685/bq2425x
DS92LV16 Power Up Reset (Rev. B)
Texas InstrumentsDS92LV16 date code VS39AD and later (middle two date code numbers will be ≥ 39) have a minor metallayer change to the chip’s power up reset and pull up circuitry to ensure robust start up with very slowsupply ramp rates. This change is very minor. It does not affect device functionality performance orreliability and requires no re-qualification.All parts sampled or purchased directly fro
Design Considerations of SN74V293 FIFO in a MicroStar BGA(TM) Package (Rev. A)
Texas InstrumentsTexas Instruments? near-chip-scale MicroSTAR BGA? package is gaining in popularity for applications where board space and/or weight are significant design factors. However no less-significant design factors are those associated with electronic coupling between signal paths when leading-edge high-speed digital signals are closely spaced.With a few simple routing and trace-location consideratio
Choosing Inductors and Capacitor for DC/DC Converters
Texas InstrumentsWireless handsets PDAs and other portable electronic devices continue to shrink while increasing in complexity. As a result engineers face design challenges with battery life PC-board space and power dissipation. These problems can be overcome by increasing the efficiency of the dc/dc converters used in these products.Efficiency is often the primary design goal when using a dc/dc converte
