FL7930C Single-Stage Flyback and Boundary-Mode PFC Controller for Lighting
... The FL7930C is an active power factor correction (PFC) controller for boost PFC applications that operate in critical conduction mode (CRM). It uses a voltage-mode PWM that compares an internal ramp signal with the error amplifier output to generate a MOSFET turn-off signal. Because the voltage-mode ...
... The FL7930C is an active power factor correction (PFC) controller for boost PFC applications that operate in critical conduction mode (CRM). It uses a voltage-mode PWM that compares an internal ramp signal with the error amplifier output to generate a MOSFET turn-off signal. Because the voltage-mode ...
TPS40020 数据资料 dataSheet 下载
... The TPS4002x series of devices are low-input voltage, synchronous, voltage mode-buck controllers. A typical application circuit is shown in Figure 1. These controllers are designed to allow construction of high-performance dc-to-dc converters with input voltages from 2.25 V to 5.5 V, and output volt ...
... The TPS4002x series of devices are low-input voltage, synchronous, voltage mode-buck controllers. A typical application circuit is shown in Figure 1. These controllers are designed to allow construction of high-performance dc-to-dc converters with input voltages from 2.25 V to 5.5 V, and output volt ...
Design Consideration for Boundary Conduction Mode Power Factor
... about input voltage is available at the internal controller. In many cases, the VCC of PFC controller is supplied by an independent power source, like standby power, so when the electric power is suddenly interrupted during one or two AC line periods, VCC is still alive during that time and PFC outp ...
... about input voltage is available at the internal controller. In many cases, the VCC of PFC controller is supplied by an independent power source, like standby power, so when the electric power is suddenly interrupted during one or two AC line periods, VCC is still alive during that time and PFC outp ...
LAMPIRAN A FOTO ALAT
... materials, such as ferrites and powdered iron. The least expensive, the bobbin core type, consists of wire wrapped on a ferrite rod core. This type of construction makes for an inexpensive inductor, but since the magnetic flux is not completely contained within the core, it generates more electromag ...
... materials, such as ferrites and powdered iron. The least expensive, the bobbin core type, consists of wire wrapped on a ferrite rod core. This type of construction makes for an inexpensive inductor, but since the magnetic flux is not completely contained within the core, it generates more electromag ...
AN EFFICIENT BRAKING ALGORITHM FOR INTERIOR
... a) Inertial, passive braking (coast down) is achieved simply by turning off the inverter. The whole braking process relies on rotor inertia, mechanical load, viscous and ventilating friction. This braking method has no practical value when being used at high motor speeds, due to very long stopping t ...
... a) Inertial, passive braking (coast down) is achieved simply by turning off the inverter. The whole braking process relies on rotor inertia, mechanical load, viscous and ventilating friction. This braking method has no practical value when being used at high motor speeds, due to very long stopping t ...
Chapter-5: MEASUREMENT OF ELECTRICAL CURRENT
... produce a torque as illustrated in figure 5.9. If the current-bearing loop is free to move, it rotates until the maximum number of lines of magnetic flux pass through the loop. This is the principle of electric motors. The force F (Newton) acting on a conductor of length L (meter), current I (ampere ...
... produce a torque as illustrated in figure 5.9. If the current-bearing loop is free to move, it rotates until the maximum number of lines of magnetic flux pass through the loop. This is the principle of electric motors. The force F (Newton) acting on a conductor of length L (meter), current I (ampere ...
1.1 Special Diodes PN junction diodes are the most
... commonly deposited on the semiconductor surface in order to make terminals for the semiconductor devices and to connect different devices in an integratedcircuit chip. Such metal-semiconductor contacts are known as ohmic contacts to distinguish them from the rectifying contacts that result in SBDs. ...
... commonly deposited on the semiconductor surface in order to make terminals for the semiconductor devices and to connect different devices in an integratedcircuit chip. Such metal-semiconductor contacts are known as ohmic contacts to distinguish them from the rectifying contacts that result in SBDs. ...
Study Material Circuit Theory 3rd Semester Electronics & Telecom Engineering
... CHAPTER -1 NETWORK ELEMENTS INTRODUCTION: An electric circuit is an interconnection of electrical elements such as resistors, capacitors, inductors, voltage source etc. In electrical engineering, transfer of energy takes place from one point to another, which requires interconnection of electrical ...
... CHAPTER -1 NETWORK ELEMENTS INTRODUCTION: An electric circuit is an interconnection of electrical elements such as resistors, capacitors, inductors, voltage source etc. In electrical engineering, transfer of energy takes place from one point to another, which requires interconnection of electrical ...
TPS40060 Wide Input Synchronous Buck
... The TPS40060 and TPS40061 use the feed-forward pin, KFF, as a user programmable low-line UVLO detection. This variable low-line UVLO threshold compares the PWM ramp duration to the oscillator clock period. An undervoltage condition exists if the device receives a clock pulse before the ramp has reac ...
... The TPS40060 and TPS40061 use the feed-forward pin, KFF, as a user programmable low-line UVLO detection. This variable low-line UVLO threshold compares the PWM ramp duration to the oscillator clock period. An undervoltage condition exists if the device receives a clock pulse before the ramp has reac ...
TPS6040x - Unregulated 60-mA Charge Pump
... The TPS60400, TPS60401 charge pumps invert the voltage applied to their input. For the highest performance, use low equivalent series resistance (ESR) capacitors (for example, ceramic). During the first half-cycle, switches S2 and S4 open, switches S1 and S3 close, and capacitor (C(fly)) charges to ...
... The TPS60400, TPS60401 charge pumps invert the voltage applied to their input. For the highest performance, use low equivalent series resistance (ESR) capacitors (for example, ceramic). During the first half-cycle, switches S2 and S4 open, switches S1 and S3 close, and capacitor (C(fly)) charges to ...
MAX8566 High-Efficiency, 10A, PWM Internal-Switch Step-Down Regulator General Description
... The MAX8566 high-efficiency switching regulator delivers up to 10A load current at output voltages from 0.6V to (0.87 x VIN). The IC operates from 2.3V to 3.6V input supplies, making it ideal for point-of-load applications. The total output-voltage set error is less than ±1% over load, line, and tem ...
... The MAX8566 high-efficiency switching regulator delivers up to 10A load current at output voltages from 0.6V to (0.87 x VIN). The IC operates from 2.3V to 3.6V input supplies, making it ideal for point-of-load applications. The total output-voltage set error is less than ±1% over load, line, and tem ...
TPS61021A 3-A Boost Converter with 0.5
... The TPS61021A employs a valley current limit sensing scheme. Current limit detection occurs during the off-time by sensing of the voltage drop across the synchronous rectifier switch. When the load current is increased such that the inductor current is above the current limit within the whole switch ...
... The TPS61021A employs a valley current limit sensing scheme. Current limit detection occurs during the off-time by sensing of the voltage drop across the synchronous rectifier switch. When the load current is increased such that the inductor current is above the current limit within the whole switch ...
Rectifier Design and Analysis
... as well, the capacitor already has a charge at t = 0, with a resultant voltage (vC) from which the first basic relationship is seen. Namely, the rectifier will not become forward biased until ve is equal to, or greater than, vC . This point in time is designated to signifying rectifier turn-on and t ...
... as well, the capacitor already has a charge at t = 0, with a resultant voltage (vC) from which the first basic relationship is seen. Namely, the rectifier will not become forward biased until ve is equal to, or greater than, vC . This point in time is designated to signifying rectifier turn-on and t ...
Auto transformer
... • As only one winding is uses the copper required for the transformer is very less • The size and hence the cost is reduced as ccompared to the conventional transformer • The losses taking place in the winding are reduced the efficiency is higher then the conventional transformer • Due to reduced r ...
... • As only one winding is uses the copper required for the transformer is very less • The size and hence the cost is reduced as ccompared to the conventional transformer • The losses taking place in the winding are reduced the efficiency is higher then the conventional transformer • Due to reduced r ...
Inductive and Capacitive Reactance
... This might be a good place to recall what you learned about phase in chapter 1. When two things are in step, going through a cycle together, falling together and rising together, they are in phase. When they are out of phase, the angle of lead or lag-the number of electrical degrees by which one of ...
... This might be a good place to recall what you learned about phase in chapter 1. When two things are in step, going through a cycle together, falling together and rising together, they are in phase. When they are out of phase, the angle of lead or lag-the number of electrical degrees by which one of ...
POWER CONDITIONER
... in mind that the ammeter may not read at all if the total load connected is less than 2 amps (240 watts). This is a likely occurrence if only relatively low power, signal processing-type equipment is connected. With the master switch off, the ammeter can still read, but will only do so if equipment ...
... in mind that the ammeter may not read at all if the total load connected is less than 2 amps (240 watts). This is a likely occurrence if only relatively low power, signal processing-type equipment is connected. With the master switch off, the ammeter can still read, but will only do so if equipment ...
Spark-gap transmitter
A spark-gap transmitter is a device that generates radio frequency electromagnetic waves using a spark gap.Spark gap transmitters were the first devices to demonstrate practical radio transmission, and were the standard technology for the first three decades of radio (1887–1916). Later, more efficient transmitters were developed based on rotary machines like the high-speed Alexanderson alternators and the static Poulsen Arc generators.Most operators, however, still preferred spark transmitters because of their uncomplicated design and because the carrier stopped when the telegraph key was released, which let the operator ""listen through"" for a reply. With other types of transmitter, the carrier could not be controlled so easily, and they required elaborate measures to modulate the carrier and to prevent transmitter leakage from de-sensitizing the receiver. After WWI, greatly improved transmitters based on vacuum tubes became available, which overcame these problems, and by the late 1920s the only spark transmitters still in regular operation were ""legacy"" installations on naval vessels. Even when vacuum tube based transmitters had been installed, many vessels retained their crude but reliable spark transmitters as an emergency backup. However, by 1940, the technology was no longer used for communication. Use of the spark-gap transmitter led to many radio operators being nicknamed ""Sparks"" long after they ceased using spark transmitters. Even today, the German verb funken, literally, ""to spark,"" also means ""to send a radio message or signal.""