High performance op amp for automotive and energy designs
Novosense Microelectronics has launched a general-purpose range of operational amplifiers with 40V and 5.5V variants for automotive and renewable energy applications
The NSOPA general-purpose rail-to-rail op amp series can be used for signal conditioning of voltage, current, temperature, and other signals, OBC/DC-DC/PDU, traction inverters, BMS, thermal management, BCM, industrial automation, photovoltaic inverters, motor drivers, digital power supplies and charging stations.
The first product line, the NSOPA9xxx, caters to high-voltage applications of up to 40V. Additionally, a low-voltage product series operating at 5.5V will soon debut. Within each series there are bandwidth options of 1MHz, 5MHz, or 10MHz, with configurations of 1, 2, or 4 channels. Both industrial and automotive-grade versions are offered for each model, ensuring comprehensive coverage of varying market requirements.
The automotive version of the NSOPA9xxx op amp series meets the reliability requirements of AEC-Q100 Grade 1, and can operate in harsh environments from -40°C to 125°C. Different package versions are available to meet different customer needs: SOT23-5, SOIC-8 for 1-channel; MSOP-8, SOP-8 for 2-channel; and TSSOP-14, SOP-14 for 4-channel.
In the naming convention of the series, OPA designates its role as an operational amplifier; the first digit, either 9 for high voltage (40V) or 8 for low voltage (5.5V); the following two digits denote the bandwidth; and the last digit indicates the number of channels. For instance, NSOPA9052 signifies a 40V (withstand voltage), 5MHz (bandwidth), 2-channel operational amplifier, streamlining identification for customers regarding its function, bandwidth, and channel count.
The NSOPA905x has an offset voltage of 200μV and a drift of 0.5μV/°C. The series also has built-in EMI/RFI filters to strengthen the suppression interference, ensuring good anti-interference and robustness of devices in practical applications.
When the power supply surpasses 4V, the typical DC Power Supply Rejection Ratio (PSRR) exceeds 130dB, while the AC PSRR reaches 85dB at 1kHz and 65dB at 10kHz. These figures surpass the industry standard, setting a new benchmark for performance, enhancing performance stability and inhibition interference coupling to the acquisition loop through the power path.
The NSOPA9xxx series provides customers with input and output rail-to-rail performance, with an input common-mode range from V–0.1 to V++0.1. The DC common-mode rejection ratio (DC PSRR) is 110dB minimum and 120dB typical in the main input pair interval of a 40V power supply. The CMRR is also very effective in suppressing the common-mode variation at high frequencies.
The op amp series has three distinct versions—NSOPA901x, NSOPA905x, and NSOPA910x—each corresponding to bandwidths of 1MHz, 5MHz, and 10MHz. A built-in slew boosting circuit is designed for handling large signals with a slew rate of 12V/μs for managing sudden pulse signals such as those encountered in overcurrent or overvoltage scenarios crucial for system safety. This high slew rate facilitates swifter triggering of protection thresholds, thereby affording crucial time for system protection mechanisms to engage. Furthermore, in terms of noise performance, the NSOPA series leverages a low-noise process platform, delivering a minimal output noise of 6μV within the low-frequency range of 0.1Hz to 10Hz.
When a large voltage difference occurs at the input of the traditional operational amplifier design, it will trigger the protection diode conducting current, and a large input current will occur, which will affect the normal operation and heating of the operational amplifier.
In typical applications, the op amp is used as a comparator, or its the analog switch in the front stage is gated to different channels. In order not to cause such problems in practical applications, customers often add resistors and capacitors to limit current, but at the expense of affecting circuit bandwidth and increasing delay.
To address this, the NSOPA905x adopts a unique design that does not cause large currents (<1μA) and avoid heating issues in the operational amplifier under the same situation, so that the operational amplifier can work stably and reliably.
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