Intersil Releases Advanced Power and Control IC For Satellite TV Systems

SPACEMART

illustration only

Milpitas CA (SPX) Aug 10, 2004
Intersil has announced the ISL6421A, a new highly integrated solution for providing power and control signals from advanced set-top box (STB) units to the satellite dish low-noise block (LNB) down converter.

This new power and control IC offers high integration to reduce space and costs, high power efficiency to reduce power dissipation and heat, and high reliability to ensure long service in customer premises equipment.

The new ISL6421A contains both a high-efficiency current-mode boost PWM converter and a low-noise linear regulator, along with the circuitry required for I2C device interfacing and for providing DiSEqC standard control signals to the LNB. A regulated output voltage is available at the output terminal (VOUT) to support the operation of the antenna port in advanced satellite STB applications.

The regulated output may be set to either 13 V or 18 V by use of an external pin (SEL18V) or the voltage select command bit (VSEL) through the I2C bus. Additionally, to compensate for the voltage drop in the coaxial cable, the voltage may be increased by 1V with the line length compensation bit (LLC) feature.

"With the introduction of the ISL6421A, Intersil now offers the flexibility to integrate single (ISL6421A) or dual LNBs (ISL6405) with the same high integration, high efficiency, and high reliability into the latest set-top box designs," said Richard Powers, director of marketing for Intersil's Broadband Power Products.

"Our ISL6405 dual-output low-noise block (LNB) down-converter supply and control voltage regulator IC is the first of its kind and was specifically designed to save satellite set-top box manufacturers board space, parts count and costs for their set-top boxes."

The device can be put into a standby mode by means of the enable bit (EN), this disables the PWM and linear regulator combination and helps conserve power. The input to the linear regulator is derived from the current mode boost converter, such that the required voltage is the sum of the output voltage and the linear regulator drop (1.0V typical).

This ensures that the power dissipation is minimized and maintains a constant voltage drop across the linear pass element, while permitting an adequate voltage range for tone injection. The device is capable of providing 450mA (typical). The over-current limit is digitally programmable to static or dynamic mode.

SPACEMART

ITOS Aquires Satellite Phone Source

Newport Beach CA (SPX) Aug 06, 2004
ITOS has entered into a definitive merger agreement to acquire 100 percent of the shares in Satellite Phone Source. All interim officers and directors of ITOS will resign immediately and Stan F. Wilson Jr. will be appointed chairman, president and CEO, while Marc J. Caparrelli is to be appointed secretary/treasurer.

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