Class D audio amplifier an efficient amplifier by Infineon Technologies, Link here A Class D audio amplifier is basically a switching amplifier or PWM amplifier. There are a number of different classes of amplifiers. This application note takes a look at the definitions for the main classifications.
Tag Archives: app note
App note: How to pick a click-and-pop suppressor
Audio noises click-and-pop suppression method from Maxim. Link here (PDF) This application note presents the MAX9890 and MAX9892 which use different approaches to remove audible click and pop from headphones. Each device is uniquely suited to different applications.
App note: Using Cymbet™ EnerChip™ batteries instead of coin cells and super capacitors
High charge/discharge cycle and solid state reliability EnerChip from Cymbet make this a good replacement for super caps and coin cell backup batteries. Link here (PDF) Primary and secondary (i.e., rechargeable) coin cell batteries, as well as super capacitors, have been in use for years as auxiliary power sources for applications including SRAM, real-time clocks, […]
App note: Battery fuel gauge IC (LC709203F) for 1-Cell Lithium-ion (Li+)
Lithium-ion fuel gauge IC from ON Semiconductors. Link here (PDF) The LC709203F is an IC that measures the remaining power level of 1-cell lithium-ion (Li+) batteries used for portable equipment etc. This product reduces fuel gauge errors with a unique correction technology during measurement of battery temperature and voltage. This technology has inherently high precision […]
App note: Snubber capacitors for complete insurance of power semiconductors
An application note from WIMA about snubber capacitors, Link here. The trend of modern semiconductor technology towards increasingly powerful applications results in the fact that switched currents and voltage levels are continuously increased and that simultaneously the switching speed is also increasing markedly. The developments in the area of power semiconductors include the component group […]
App note: Selection of capacitors for pulse applications
Guidelines from WIMA about selecting capactiors for pulsed conditions. Link here The maximum permissible AC voltage that can be applied to capacitors in sinusoidal waveform applications, can be determined from the graphs in the respective capacitor ranges. However, where pulse conditions exists, the following procedure is to be observed to ensure that the correct capacitor […]
App note: Measuring a loudspeaker impedance profile using the AD5933
An application note from Analog Devices about AD5933, this provides a low cost substitute to expensive test equipment like signal generators, oscilloscope and voltmeters in getting the speaker’s impedance profile. Link here (PDF) This application note describes a circuit architecture using the AD5933 that allows the system designer to measure the impedance profile of the […]
App note: Choosing the appropriate component from data sheet ratings & characteristics.
Chossing the right power semiconductor for an application, a technical note from IXYS. Link here This application note is intended to show how to choose the appropriate rating of a power semiconductor component for a known application using the specifications given in the datasheet. The explanations have been kept sufficiently general to be applicable to […]
App note: Voltage to current conversion
Using Apex Microtechnology’s power op amps for voltage controlled current sources (VCCS’s) application note, Link here (PDF) Voltage controlled current sources (or VCCS’s) can be useful for applications such as active loads for use in component testing or torque control for motors. Torque control is simplified since torque is a direct function of current in […]
App note: Programmable power supplies
Apex Microtechnology’s application note about programmable power supplies. Link here (PDF) The programmable power supply (PPS) is not only a key element in automated test equipment, but it is also used in fields as diverse as industrial controls, scientific research and vehicular controls. When coupled to a computer, it bridges the gap from the software […]
App note: Wear leveling in NAND flash memory
Application note/Technical note from Macronix on extending the maximum endurance limit of NAND flash memories by wear leveling. Link here (PDF) NAND flash memory is widely used in today’s embedded systems for code and data storage applications. Some applications are required to perform numerous Program and Erase operations on the NAND flash memory after system […]
App note: Understanding a digital transistor datasheet
Application note from ON Semiconductors about digital transistors where two resistors are built-in the transistor package. Link here (PDF) This application note will describe the common specifications of a Digital Transistor. It will also show how to use these specifications to successfully design with a Digital Transistor.
App note: Solid state relay parallel and DC operation
Parallel two solid state relays for improved current handling and avoiding imbalance of load distribution are discussed in this an app note from Vishay. Link here (PDF) Vishay solid state relay (SSR) outputs can be wired in parallel enabling the user to benefit from lower on-resistance and higher load currents for AC/DC switching applications. This […]
App note: Solid-State Relays
Solid-state relays introduction from Vishay, Link here (PDF) MOSFET SSRs feature an optocoupler construction, but have a pair of MOSFETs on the output instead of a phototransistor. A pair of source-coupled MOSFETs emulate an electromechanical relay by providing bidirectional switch capability and a linear contact. No output power supply is required.
App note: Flow sensing in tankless water heaters
Contactless reed switches from Littelfuse provides flow and water presence monitoring. Link here (PDF) Reed switches and sensors are highly effective solutions for flow sensing applications that can be used for detecting the presence of fluid flow in a system or even measure the rate of fluid flow. Tankless water heaters are becoming a widely […]
App note: Circuit protection technology application matrix application guide
Here’s an application matrix of Littelfuse’s circuit protections, Link here (PDF)
App note: Parallel configuration of H-bridges featuring the MC33932 and MC34932 ICs
Old application note from ON Semiconductors on getting increased power capability by paralleling H-bridges and overcoming current limit imbalance between the two drivers by properly designing the board layout. Link here (PDF) Two or more H-bridges can be operated in parallel to increase the current handling capacity of the circuit. In this application note, paralleling […]
App note: Duty cycle and power optimization
Power saving specially on battery operated devices need to be kept, in this application note from ON Semiconductors discussed how to keep duty cycle in which a wireless RF device is operated at a minimum time. Link here (PDF) Consider a battery powered device (target), which should receive data from a second device (initiator) from […]
App note: Rectifiers for Power Factor Correction
Another Vishay’s app note about power factor correction this time about the component used and their effects. Link here (PDF) PFC devices are generally selected base on the speed of their reverse recovery time (trr). Currently for CCM (Continuous-Conduction-Mode) and CRM (Critical Conduction-Mode) PFC devices in market, rectifiers up to 600 V with trr smaller […]
App note: Power factor correction with ultrafast diodes
Vishay’s app note in keeping the power supplies’ power factor in check with their ultrafast diodes. Link here (PDF) More and more switched mode power supplies (SMPS) are being designed with an active power factor correction (PFC) input stage. This is mainly due to the introduction of regulations aimed at restricting the harmonic content of […]