Monolithic motor solution simplifies appliance circuits
ProductSimplified bookmark0 Monolithic Motor Solution Simplifies Home Appliance Circuits Provides High-Speed, High-Voltage Gate Driver ICs in Half-Bridge FredFET Two-in-One Device-Based Single-, Two- and Three-Phase Motor Driven Half-Bridge Inverter Designs in MniSIP Packages For refrigerator compressors, fans, and pumps up to 400W (250W without radiators).
The IR3101 is a complete driver IC that incorporates a proprietary high voltage integrated circuit (HMC) and latch-up CMCS technology. The output section features two monster FETs (FredFET) XFET power IVCSFETs that provide low di/dt gate drive, enhanced noise immunity, and reduced losses. The propagation delays of the high-side and low-side power FredFET devices can be matched to each other to achieve better synchronous switching characteristics while reducing output distortion. The device can operate up to 150C and a maximum rated input voltage of 500V. The device is in an all-insulated MniSIP package. Each lead is equipped with electrostatic discharge (ESD) protection. The insulation rating is 1500Vrns for one minute, and the rated current at 100C is L6A. The inverter frequency is 20kHz and includes a bootstrap diode.
The 700V maximum startup voltage of the PWM controller bookmark3 provides the control output for the active clamp circuit, driving the primary MCSFET and the auxiliary MOSFET bookmark4 Highly integrated voltage type PWM controller The NCP1280's active clamp circuit provides high voltage (up to 700V) startup The active clamp circuit is provided with a control output to drive the forward converter primary MOSFET and the auxiliary MOSFET, and a programmable delay secondary output can be used to drive the synchronous rectifier in a secondary or asymmetrical half-bridge circuit. Other features include a 700V start-up circuit, voltage feed-forward, adjustable maximum duty cycle control, adjustable oscillator frequency up to 500kHz, line undervoltage and overvoltage monitors, dual mode overcurrent protection, and soft start using savings Space SCIC-16 package.
Compared to traditional forward converter topologies, the active clamping scheme using the NCP1280 provides lower switching and conduction losses, requires a smaller output inductor, and reduces the voltage in the primary and secondary rectifiers The stress of these components thus reduces board space and total cost.
Four-way Power-over-Ethernet Controller Operates Independently and Supports DC and AC Disconnect Sensing Methods The Quad Power-over-Ethernet (PoE) Controller Compliant with the IEEE 802.3af Specification The LTC4258/9 can be controlled in an auto-independent or processor-controlled mode Four independent -48V Ethernet ports provide autonomous operation of the power supply equipment (PSE). No processor intervention is required to process all workloads in sequence. The LTC4258 features 802.Baf detection and classification, normal or errant current limiting, current foldback short-circuit protection, and DC disconnection detection. The LTC4259 also adds the ability to monitor AC disconnect status.
The 4-bit programmable digital address allows control of up to 64 channels. The programmable interrupt pin eliminates software polling and communicates with the host via the 2-wire I2C bus, requiring very little software support with precision-specific settings. The built-in circuit can accurately detect, classify, and sense currents. High-voltage technology with -48V operation is used for the source part. 3.3V power is used for complex logic and interfaces. It only needs to detect external components such as resistors and passive components.
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