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ISO7742TBDWRQ1: Automotive-grade four-channel enhanced digital isolator with integrated 420kHz transformer driver

Characteristics and advantages

The ISO7742TBDWRQ1 digital isolator has the following features:

Comply with the requirements of EC-Q100 for automotive applications

Device temperature class 1: Ambient operating temperature range from -40 °C to 125°C

Functional safety type

Documents helpful for the design of the ISO 26262 system

100Mbps data rate

Stable and reliable isolation fence:

It is expected to have a lifespan of over 30 years at a working voltage of 1500VRMS

The rated value is 5000VRMS

The surge capacity is as high as 12.8kV

A typical CMTI of ±150kV/µs suitable for digital isolators

Wide power supply voltage range: 2.25V to 5.5V

2.25V to 5.5V level conversion

The default output options are high level (ISO774xT) and low level (ISO774xFT)

Low power consumption. The typical current value per channel is 1.5mA at 1Mbps

Low propagation delay: The typical value is 10.7ns at 5V

Excellent electromagnetic compatibility (EMC)

System-level ESD, EFT and surge immunity

Push-pull drivers for transformers

High output drive: The maximum current is 0.7A when powered on a 5V supply

The maximum value is 0.4Ω with a low RON and a 4.5V power supply

Spread spectrum clock

When a 5V power supply is adopted, the typical current limit value of the transformer driver is 1.75A.

Safety-related certifications (under review) :

DIN EN IEC 60747-17 (VDE 0884-17)

UL 1577 Component Certification Program

IEC 61010-1, IEC 62368-1, IEC 60601-1 and GB 4943.1 certifications

Description

ISO7742TBDWRQ1 is a high-performance four-channel digital isolator of grade 1 that integrates a transformer driver, has an isolation level of 5000VRMS, and complies with UL 1577 standards. Enhanced insulation grades that comply with VDE, CSA, TUV and CQC standards.

While isolating complementary metal-oxy-semiconductor (CMOS) or low-voltage complementary metal-oxy-semiconductor (LVCMOS) digital I/O, the ISO7742TBDWRQ1 device can also provide high electromagnetic immunity and low radiation while featuring low power consumption. The logic input and output buffers of each isolated channel are isolated by a double-capacitor silicon dioxide (SiO2) insulated gate phase. If the input power or signal is lost, devices without the suffix "F" will output a high level by default, and devices with the suffix "F" will output a low level by default.

The ISO7742TBDWRQ1 features a low-noise and low-EMI push-pull transformer driver, specifically designed for small isolated power supplies. The transformer driver drives the thin intermediate tap transformer through a DC power supply ranging from 2.25V to 5.5V. Extremely low noise and EMI were achieved through the control of the slew rate of the output switching voltage and the spread spectrum clock (SSC). The ISO7742TBDWRQ1 consists of an oscillator and a gate driver circuit, which can provide complementary output signals for driving the ground reference N-channel power switch. The ISO7742TBDWRQ1 features two 0.7A power MOSFET switches to ensure normal startup under heavy load conditions. The internal protection features include 1.75A current limiting, under-voltage locking, thermal shutdown and the circuit of breaking first and then closing. The ISO7742TBDWRQ1 features a soft start characteristic, which can prevent high inrush current from occurring during the power-on period of large-load capacitors. In addition, the ISO7742TBDWRQ1 features a 420kHz internal oscillator suitable for applications that require higher efficiency and a smaller transformer size.

Application field

ISO7742TBDWRQ1 is applicable to various automotive electronic systems that require high reliability and electromagnetic compatibility, including:

Hybrid, electric and powertrain systems (EV/HEV)

Battery Management System (BMS)

Vehicle-mounted charger

Traction inverter and motor control

• DC/DC converter

Vehicle body electronic device

• Car parking heater module

• HVAC control module

Contact us

If you need to obtain the price information of [ISO7742TBDWRQ1], please visit the official website of Mingjiada Electronics (www.hkmjd.com) for details.