Optically Isolated Error Amps have programmable shunt references.

Press Release Summary:

Designed for power supply feedback, LIA135 and LIA136 feature 1.6–10 V input range and integrate programmable precision shunt reference in 8-pin package. Error amplifier and shunt reference can operate down to 1.6 V, while 1.299 V internal precision voltage reference with 0.5% tolerance improves power supply accuracy. Optocoupler portions comprise IR LEDs optically coupled to NPN phototransistors; current transfer ratio ranges from 500%–2,000%. LIA136 operates up to 110°C.

Original Press Release:

IXYS Introduces New Low Voltage Optically Isolated Error Amplifiers with Precision Programmable Shunt References

The LIA135 and LIA136 Feature an Input Voltage Range of 1.6V to 10V and are designed specifically for Power Supply Feedback

Beverly, Massachusetts, USA – IXYS Integrated Circuits Division (ICD), Inc., a wholly owned subsidiary of IXYS Corporation (NASDAQ: IXYS), announced the availability of the LIA135 and LIA136 low voltage optically isolated error amplifiers each with an integrated programmable precision shunt reference incorporated into a single 8-pin package.  Unique to this pair of devices is the capability of the error amplifier and shunt reference to operate down to 1.6V, the industry’s lowest level, enabling higher efficiency, isolated low voltage power supply designs. The LIA135 and LIA136 offers a 1.299V internal precision voltage reference with a very low 0.5% tolerance for improved power supply accuracy.

Optically isolated error amplifiers are important integrated devices for secondary to primary side feedback in AC-to-DC power supplies and DC-to-DC converters. These optical devices save board space and replace bulky transformer secondary feedback circuits. The LIA135 and LIA136 combination of features are optimal for use in isolated power supply design as the bias current for the shunt regulators does not pass through the LED. This eliminates bias-related optical current, providing the user with the industry’s largest dynamic range (1000:1).

The optocoupler portions of the LIA135 and LIA136 comprise of infrared LEDs that are optically coupled to NPN phototransistors. The optocouplers' current transfer ratio is between 500% and 2000%. The LIA136 offers enhanced performance characteristics and an extended operational temperature range to 110C.

These devices are available in DIP and surface mount (SMT) packages, and have the following approvals:

• UL Recognized Component: File # E76270

• CSA Certified Component: Certificate # 1305490

Pricing and Availability

The LIA135 and LIA136 are available in production quantities. OEM pricing is $0.49 and $0.54 respectively in quantities of 25KU.

About IXYS ICD and IXYS Corporation

IXYS Integrated Circuits Division, (ICD), a leader in the design and manufacture of solid state relays and high voltage integrated circuits, is a wholly owned subsidiary of IXYS Corporation. IXYS Corporation develops and markets primarily high performance power semiconductor devices that are used in controlling and converting electrical power efficiently in power systems for the telecommunication and internet infrastructure, motor drives, medical systems and transportation. IXYS also serves its markets with a combination of digital and analog integrated circuits, power systems and RF GaAs and GaN based products. Additional information about IXYS Integrated Circuits Division, Zilog and IXYS may be found at www.ixysic.com, www.zilog.com and www.ixys.com.

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