This application note presents a simple, cost-effective, pre-IEEE® 802.3at PoE+ Powered Decice (PD) solution that employs the MAX5941B. The preliminary requirements of PoE+ PDs are discussed, as is the advantage of extending the existing MAX5941B circuit to implement a PoE+ PD. Test results including inrush-current limit, efficiency, output ripple, and dynamic response are presented for a 3.3V, 30W PD.
This application note describes a two-phase, synchronous, step-down converter that is fully compliant with the AMD® K8 Low-Power Mobile Specification. It includes details of the circuit operation, schematic, bill of materials, and a 1.2 volt, 27.3 Amp reference design with test data.
Brushed motors are a relatively popular motor design option due to their low price and simple control scheme. A brushed motor has a wound rotor and a permanent magnet stator. The motor is commutated via a conductive ring: this ring is connected to the rotor, which uses a brush to scrape against the commutator ring, thus commutation is achieved. Therefore, the direction of current flowing through the motor can change depending on the brush orientation and different commutation rings. Simple direction changes and speed control changes can be quickly and efficiently implemented on brushed DC motors using an H-bridge. An electronic driver is required to control the motor current in a brushed DC motor. The electronic drive circuit contains a power stage with a two-phase inverter (to meet the required power intensity), a microcontroller for implementing motor speed commands and fault handling, a current sensing function for motor start/stop protection, for control Gate drivers for two-phase inverters and power supplies for microcontrollers and other low-voltage devices.
TIDM-CAPTIVATE-64-BUTTON TI reference design demonstrates an ultra-low power touch panel with 64 buttons that can be controlled from a single MSP microcontroller (MCU) with CapTIvate™ technology. The design uses mutual capacitance technology to ensure that all 64 buttons are tightly packed and can be controlled with just 16 MCU pins. This touch panel easily connects to the CAPTIVATE-FR2633 MCU target module included in the MSP-CAPT-FR2633 MCU development kit.
This reference design utilizes an isolated modulator and independent digital filter to implement a Class 0.5 three-phase power measurement system with an isolated shunt sensor, eliminating the need for an integrated synchronization filter and allowing an optional host microcontroller (MCU). ) will be broader in scope. In this design, the current sensed by the isolated modulator and the phase voltage sensed by the host microcontroller are synchronized; more advanced metering algorithms are supported using the Simplelink™ ARM Cortex M4 host MCU. This design protects against magnetic tampering attacks by using current sensors and a power supply that does not use any transformers or other magnetic components. This subsystem design has been tested and includes hardware.
This TEA1836 board demonstrates an ultra-compact, high power density, and cost-effective 45 W / 19.5 VAC/DC switch mode power supply (SMPS) wall adapter, typically used for ultrabook and tablet likely applications.
The PMP11769 reference design is a comprehensive solution for 700W automotive audio amplifiers. This boost converter provides a 36.0V, 10.0A continuous/20.0A peak output from an input voltage of 9 to 16V. It contains two Class D amplifiers delivering 2 x 175W (loaded into 4 ohms, left and right channels) and 1 x 350W (loaded into 2 ohms, subwoofer) power.
This reference design demonstrates an interface implementation to multiple high-voltage bipolar input, 8-channel, multiplexed input SAR ADCs (6) via a Sitara Arm processor using a Programmable Real-Time Unit (PRU- ICSS) expands the number of input channels. The ADCs can be configured so that the same channels can be sampled simultaneously across all ADCs. This design highlights the PRU-ICSS's ability to handle a data rate of 1536ksps (each sample = 16 bits) (640 samples sampled per line cycle). For a 50Hz period, this equates to 32ksps per channel between 6 ADCs simultaneously (640 samples/period*50Hz*6 ADC*8 channels = 1536ksps). In addition, a second PRU is used to post-process the data to achieve coherent sampling.
This reference design for a 6A step-down LED driver is based on the MAX16821 device. This circuit drives a single LED. This design includes the circuit specifications, circuit schematic, and circuit description and performance.
The BATT-14AAAPACK is a configurable battery pack that can power the MC33771 or MC33772 evaluation board.
This fully tested, USB power delivery reference design is a high efficiency, high power density, AC/DC adapter solution with a wide input voltage range (85 - 265VAC) for laptop adapters and smartphone charger applications. It adopts active-clamp-flyback topology controlled by TI’s newest ACF controller UCC28780 as the mainly power supply stage. This design uses TPS25740B, TI’s PD source controller, to achieve a full PD 2.0 function. The design achieves a peak efficiency of 94% at a very high switching frequency. The design’s power density is increased to 30 W/in3, which is much higher than traditional solutions.
This reference design provides design guidelines, data and other content for a constant current 100W power supply for LED lighting with PFC and wide input voltage range (i.e. AC 90V to 264V).
Several 51 chips were also used in the design.
Low Standby Current, Non-Isolated Flyback Power Supply Using LinkSwitch-TN2 (LNK3202D)
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