−2 V to 70 V Wide Input Voltage Range, 2.7 MHz High Bandwidth, Current-Sense Amplifier with PWM Rejection and Gain 50 V/V

TThe AD8411A is a high-voltage, high-bandwidth current-sense amplifier. The device features an initial gain of 50 V/V, with a 2.7 MHz bandwidth with a maximum ±0.15% gain error over the entire temperature range. The buffered output voltage directly interfaces with any typical converter. The AD8411A has a minimum DC com- mon-mode rejection ratio (CMRR) of 123 dB from −2 V to +70 V. The AD8411A performs bidirectional current measurements across a shunt resistor in various industrial and automotive applications.

The AD8411A offers breakthrough performance throughout the −40°C to +125°C temperature range. The device features an in-package trim core, which leads to a typical offset drift of ±0.26 μV/°C (based on Box Method, see Figure 56) throughout the operating temperature range and the common-mode voltage range without the need for chopping and auto-zero clocks (which could lead to intermodulation in the application). The device includes circuitry to achieve a wide input common-mode range and balanced input bias currents, regardless of input differential voltage or common-mode voltage, and circuitry to achieve ultra-low CMRR drift. The device also includes circuitry to enable output accuracy in the presence of pulse-width modulation (PWM) type input common-mode voltages. The AD8411A is available in 8-lead SOICN, 8-lead MSOP, and 10-lead MSOP packages.

Applications

* In-phase or High-side current sensing in

* BLDC motors, Low-inductance motors

* Bidirectional 48 V to 12 V DC-DC converters

* Solenoid controls

* Power rail monitoring

* Low-side current sensing

* Datacenter power supply unit (PSU) and battery backup unit (BBU)

Protected by U.S. patent numbers 10,312,865 and 10,587,228.

* 2.7 MHz small signal, −3 dB bandwidth

* In-package Trim Core (DigiTrim™)

* Precision without chopping and/or auto-zero

* Typical ±0.26 μV/°C offset drift

* Maximum ±200 μV voltage-offset over temperature range

* Typical DC CMRR: 142 dB

* Typical AC CMRR at 50 kHz: 96 dB

* Wide common-mode input voltage range

* −2 V to +70 V, continuous operation

* −20 V to +85 V, continuous survival