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Current sense amp mixes high voltage, fast response time

Posted: 04 May 2005 ?? ?Print Version ?Bookmark and Share

Keywords:linear technology? current sense amplifier? amplifier? ltc6101?

Linear Technology Corp. rolled out a high side current sense amplifier that combines very quick response times with an input voltage range of 4V to 60V.

The new LTC6101 can withstand voltages up to 70V. According to Linear Tech, this is a valuable feature when power supply failures or catastrophic load changes can lead to transient overvoltage. With a response time under 1?s, this new device is suitable for automatic power shutdown under fault conditions.

The LTC6101 is designed to extract a small differential signal from a high common mode voltage, and then amplify and translate this into a ground-referenced signal. Achieving this functionality with precision has typically required a combination of discrete components and op-amps, differential amplifiers or instrumentation amplifiers, explained the company. The LTC6101 simplifies this task by requiring only the LTC6101 ThinSOT package and two resistors. Not only is this part much smaller and simpler, it consumes only 250?A, added Linear Tech.

"The LTC6101 solves many current sense design problems," said Brendan Whelan, the company's design section lead. "With the LTC6101, we combine high voltage, high precision, fast response time and flexibility in a tiny SOT-23 package."

Other features

The LTC6101 features an input bias current of 170nA (max) and input offset voltage of 300?V (max). Better than 1 percent accuracy can be achieved using precision gain resistors, allowing for excellent measurement resolution and the ability to accommodate inputs with large dynamic range.

The LTC6101 is in full production, with prices starting at $1.04 each in 1,000-piece orders.

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