Agilent Unveils Current-sensing ICs for Low-power Motor Control

7/1/2003 - Agilent Technologies Inc. (NYSE: A) introduced two single-ended, optically isolated, linear current-sensing ICs. The Agilent HCPL-7510 and HCPL-7520 are specifically designed for low-power electronic-controlled motor drive current-sensing applications.

As motor drive inverter technology matures, digitally controlled motors are appearing in an expanding range of both industrial and non-industrial low-power motor control applications. These applications include low-power inverter current sensing, motor phase and rail current sensing, and general-purpose analog signal isolation. The Agilent linear current-sensing ICs provide maximum protection and performance with minimum power consumption.

In a typical implementation, motor current flows through an external resistor and the linear current sensor IC detects the resulting voltage drop. A proportional output voltage is produced on the other side of the IC's optical isolation barrier, which provides the necessary information to the low-voltage, solid-state control circuitry. Agilent also supplies a family of half-bridge gate drive optocouplers that safely couple the control signals back to the electric motor drive circuits. These optocouplers isolate sensitive circuitry from high-voltage surges and are used in inverters based on insulated-gate bipolar transistors (IGBTs) or power MOSFETs (metal oxide silicon field effect transistors). Agilent's optically isolated motor control products meet UL (United States) safety standards, with CSA (Canada) and DIN EN (Europe) certification pending.

The Agilent HCPL-7510 and HCPL-7520 incorporate advanced sigma-delta analog-to-digital converter technology to provide accurate linear current sensing performance with single-ended output. Key product specifications include 15 kV/microsecond common-mode rejection at 1000V common-mode, 100 kHz bandwidth, single-ended output, 0.06 percent nonlinearity, and a gain tolerance of +/- 3 percent (HCPL-7510) or +/- 5 percent (HCPL-7520). These features ensure true isolation, high noise immunity, and the stability needed to accurately monitor motor current in noisy motor control environments. The HCPL-7510 and HCPL-7520 are supplied in a compact, auto-insertable 8-pin DIP package to reduce board space, insertion time and cost.

U.S. Pricing and Availability
Pricing for the Agilent HCPL-7510 and HCPL-7520 are $2.31 and $2.13 each in 5,000-9,999 quantities, respectively. These products are immediately available through Agilent's direct sales channel and through Agilent's worldwide distribution partners. More information on Agilent's optically isolated products is available at

About Agilent Technologies
Agilent Technologies Inc. (NYSE: A) is a global technology leader in communications, electronics, life sciences and chemical analysis. The company's 32,000 employees serve customers in more than 110 countries. Agilent had net revenue of $6 billion in fiscal year 2002. Information about Agilent is available on the Web at

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