Friday, December 07, 2018

LM317 - Adjustable 3-terminal Regulator

The LM117 series of adjustable 3-terminal positive voltage regulators is capable of supplying in excess of 1.5A over a 1.2V to 37V output range.

3-Terminal Adjustable Regulator

Because the regulator is and detects only the input-to-output differential voltage, supplies of several hundred volts can be regulated as long as the maximum input-to-output differential is not exceeded. That is, avoid short-circuiting the output.

LM317 - Adjustable 3-terminal Regulator

By connecting a fixed resistor between the adjustment pin and output, the LM117 and LM317-N can be also used as a precision current regulator. Supplies with electronic shutdown can be achieved by clamping the adjustment terminal to ground.

The LM117 and LM317-N offer full overload protection such as current limit, thermal overload protection and safe area protection. All overload protection circuitry remains fully functional even if the adjustment terminal is disconnected.

Tuesday, November 27, 2018

LM3445 - TRIAC dimmable offline LED driver

Conventional TRIAC dimmers are designed to interface to a resistive load (halogen or incandescent bulb), while today's LED driver solutions interfaced to a standard wall dimmer produce 120 Hz flicker of the LED and/or do not allow 100:1 dimming.

LM3445 - TRIAC dimmable offline LED driver

The LM3445 provides a constant current for illuminating high power LEDs and includes a TRIAC . The LM3445 contains all the necessary circuitry to build a line-powered (mains powered) constant current LED driver whose output current can be controlled with a conventional TRIAC dimmer.

LM3445 - TRIAC dimmable offline LED driver

Thermal shutdown limits total power dissipation by turning off the output switch when the IC junction temperature exceeds 165°C. After thermal shutdown occurs, the output switch doesn ’t turn on until the junction temperature drops to approximately 145°C

Sunday, November 25, 2018

ROHM - Electronic Components

ROHM Co. Ltd. was established in Kyoto, Japan, in 1958. ROHM designs and manufactures semiconductors, integrated circuits and other electronic components. These components find a home in the dynamic and ever-growing wireless, computer, automotive and consumer electronics markets.....

ROHM - Electronic Components

1954 - Toyo Electronics Industry established. Carbon film resistors developed and marketed.
1967 - Transistors and switching diode developed and marketed.

Company History Rohm

Discrete Semiconductors, Opto Electronics, LED / LCD Drivers, Sensor ICs, Laser Diodes, Contact Image Sensor.

ROHM - Electronic Components

High speed Switching - High Voltage Resistance MOSFET Series

ROHM expands its widely used lineup of high speed switching, high voltage resistance MOSFETs for PFC circuits in switching power supplies and main switch circuits with a variety of package types.

ROHM Semiconductor Americas
2323 Owen Street Santa Clara, CA 95054 United States

Thursday, November 22, 2018

Intersil - Analog and Power Semiconductors

Intersil's products include amplifiers, analog front ends, communication interfaces, data converters, digital potentiometers, display solutions, DSL solutions, optical storage products, power management products, real time clocks, switches/MUX's, etc. In 2017 Intersil  became a part of Renesas.

Intersil - Analog and Power Semiconductors

Intersil - Analog and Power Semiconductors

Intersil has developed into a leading analog semiconductor manufacturer with five specialized product groups: Consumer Power, Consumer Electronics, Analog Mixed Signal, Industrial Communications and Automotive & Military/Space Specialties.

History

Intersil was founded in 1967. After being acquired by General Electric Corp in 1981, it was sold to Harris Corporation in 1988, at which point the name was retired. Intersil at Wikipedia.

Monday, October 22, 2018

7800 and 7900 Series Voltage Regulators

The LM78XX series of three-terminal positive regulators is available in the TO-220 package and with several fixed output voltages, making them useful in a wide range of applications. Each type employs internal current limiting, thermal shut-down, and safe operating area protection.

7805 is popular for Embedded Systems and 7905 is sometimes used for the Dual Supply needs in such Microcontroller cards with Mixed Design sub-sections like A/D or Opamps.

7812 and 7912 are very popular in powering Traditional Opamp or communications circuits with a stable and reliable Dual Supply.

Power Supplies Section - Here you will find examples of 7824 and 7924 Power supplies.
Fairchild LM7812

In Instrumentation and Industrial Circuits where Size is not a problem and the current or power usage is less. A Mains transformer, bridge regulators, capacitors and these regulators are a time tested low noise and robust system.

SMPS does have EMI-RFI problems, hence use when small sizes are needed and high currents are required. In battery powered devices switching supplies are inevitable as they are power efficient.

MC7800 MC7900 1 Amp Voltage Regulators

These voltage regulators are monolithic integrated circuits designed as fixed−voltage regulators for a wide variety of applications including local, on−card regulation. These regulators employ internal current limiting, thermal shutdown, and safe−area compensation. 78 and 79 series voltage regulators are the most common in power supplies and easy to use.

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