Power Integrations Introduces Reference Design for 5W LED Lamps with Power Factor Correction and Flicker Free Thyristor Dimming

SAN JOSE, Calif.--(BUSINESS WIRE)--Power Integrations, Inc. (Nasdaq: POWI), a leader in high-voltage integrated circuits for energy-efficient power conversion, today unveiled a new 5 W offline LED Driver Reference Design (RDK-251) with flicker-free TRIAC dimming and single-stage power factor correction (PFC). The reference design is based on Power Integrations' innovative LinkSwitch-PL family of LED driver ICs, the LNK457DG, for a compact, non-isolated power supply.

The new reference design provides a single 350 mA constant current output at 15 V rated LED string voltage. Using a standard AC mains thyristor dimmer reduces the output current to 1% (3 mA), which does not cause the LED array to be unstable or flicker. The power supply is compatible with both low-cost leading edge dimmers and more complex trailing edge dimmers. It operates over a universal AC input range (85 VAC to 265 VAC, 47 Hz to 63 Hz) with AC withstand voltages from 0 VAC to 300 VAC, enhancing field application reliability and extending line voltage dips And the service life under sudden rise conditions.

The new reference design has a higher power factor (>0.9) and lower input current total harmonic distortion (THD) (<10% at 115 VAC and <15% at 230 VAC), making it easy to meet international energy efficiency standards. Requirements and make individual designs available worldwide. In addition to the LinkSwitch-PL device, the new reference design uses only 38 passive components and discrete components (29 components for non-dimming applications), making it ideal for compact power supplies. Since the passive components required in the design of the old LED driver are omitted, the manufacturability and service life are also improved, and the components that are omitted include large-capacity capacitors and low-reliability high-voltage electrolytic capacitors. Like its corresponding isolated IC family, the LinkSwitch-PH, the LinkSwitch-PL integrates the controller and high-voltage power MOSFETs onto a single silicon chip, further reducing component count and eliminating parasitic components between the controller and the high-voltage power MOSFET. Can greatly simplify the layout of the PCB.

The board can be housed in a pear-shaped A19 LED replacement lamp with an E26/27 lamp holder. The RDK-251 provides complete power specifications, schematics, bill of materials, transformer documentation, printed circuit board layout, and performance data.

Bill Weiss, lighting business development manager at Power Integrations, said: "This design enables high-quality dimming of SSL lamps, high power factor, low THD, compact form factor and high reliability. In addition, it can meet or exceed all energy efficiency. Regulatory requirements. Solid-state lighting manufacturers can build a platform that can operate at both low voltage and high voltage. For system designers, this compact, lightweight, high-performance design speeds time to market."

A Small Computer System Interface (SCSI) connector, also pounced as [scuzzy" connector, is used for physically connecting and transferring data between computers and peripheral devices.

SCSI Connectors type and interfaces

Centronics 50-pin connector: The Centronics 50-pin connector was once the most widely used Scsi Connector. An external connector only, the Centronics is a SCSI-1 connector that looks the same as the Centronics cable that attaches to a parallel port printer. The Centronics 50-pin cable comes in male and female styles, and Gender Changers and cable converters are commonly available. Although used on older SCSI devices and external drive enclosures, this interface is no longer heavily used, due to its slow speed and short cable lengths.
High-density 50-pin connector: The high-density 50-pin connector is used on scanners and Jaz drives. It is one of the more common SCSI connectors and is usually used to connect SCSI-2 devices. Both ends of the cable are usually 50-pin male, while the sockets on the host adapter and external devices are 50-pin female.

DB 25-pin connector: The DB 25-pin or D Sub 25 is by far the most widely used connector. This connector is used for parallel and serial printers in addition to the many other devices available. Both ends of the cable are usually 25-pin male, while the sockets on the host adapter and external devices are 25-pin female. This cable is almost always an external connector.
Note: DB-25 SCSI cables are not compatible with and should not be used as serial or printer cables; serial cables and printer cables should not be used or attached to DB-25 SCSI adapters. You can short out the SCSI host adapter or the motherboard by using the wrong cable. Marking cables is the best way to avoid this.

IDC50 connector: The IDC50 is the most common internal SCSI connector. It is very similar to the standard IDE internal ribbon cable. The IDC50 SCSI cable is considerably wider then an IDE ribbon cable; in fact, it is usually the widest standard internal cable in use. This is a standard SCSI-2 10MBps internal SCSI cable. Many low-end cables have only two or three connectors, allowing for one or two devices to be attached to the cable. Seven-device cables are available, though they are often expensive and require a large case, as the cables may be four or five feet long.
High-density 68-pin connector: The high-density 68-pin connector is the SCSI connector of choice for SCSI-3 host adapters and peripherals. There is an internal ribbon cable version that looks very similar to the IDC50 connector. Many low-end cables have only two or three connectors, allowing for one or two devices to be attached to the cable. Seven-device cables are available, though they are often very expensive and require a large case, as the cables may be three or more feet long. Both ends of the external cable are usually 68-pin male, while the sockets on the host adapter and external devices are 68-pin female.

SCA 80-pin Micro-Centronics connector: SCA stands for Single Connector Attachment, a type of disk drive connector that includes connection pins for the power cables as well as the data wires. A SCA connector uses an 80-pin plug and socket to connect peripherals. This connector combines power, data channel, and ID configuration for fast installation and removal. SCA connectors are typically found only on high-end SCSI hard disks. The SCA interface was designed to provide a standard connection for systems using drives that can be hot-swapped. SCA makes swapping SCSI hard drives much easier than with traditional SCSI cables, plugs, and sockets. An adapter enables SCA drives to fit into standard SCSI enclosures.

SCSI SFF 8482: Also called "4x internal" by some vendors. This is a connector with the same form factor as SATA with the addition of a "bump" to key it specifically for SAS. (SATA drives can be plugged into SAS controllers, but SAS drives will not function with a SATA controller; hence, the necessity for the key bump on the connector.) As the name says, it's meant to be used internally, i.e., inside the computer case.

SCSI SFF 8484: Also called "32-pin" or "MultiLane". This is a high density connector usually intended to plug into the motherboard, controller, or backplane itself. Cables with this connector on one end usually have four individual SFF 8482 connectors on the other.
Serial Attached SCSI SFF 8470: Also called "4x external" by some vendors. This is simply a version of the SFF 8484 that's meant to be used with external (i.e., not located within the case) drives.

SCSI Connectors

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