ISL78171ARZ

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The ISL78171ARZ is a single-channel, dimmable LED regulator with integrated power MOSFET. This regulator provides reliable control of a wide range of input voltages from an input voltage range of 4.5V to 28V, making it suitable for automotive and industrial applications. The ISL78171ARZ supports a continuous PWM dimming frequency range from 1kHz to 32kHz while providing intelligent dimming features such as LED life extenders and toggles. This regulator also features low power consumption and low quiescent current, making it suitable for low power LED applications.

The ISL78171ARZ offers ultralow ripple voltage, further improving system reliability and performance. In addition, it offers a wide ambient temperature range of -40°C to +125°C and is highly efficient, achieving a thermal efficiency of up to 95%. The integrated MOSFET reduces the costs, board space and EMI/RFI as another advantage of this product.

Application Field

The ISL78171ARZ is mainly feature-rich customizable, making it an ideal choice for automotive, industrial, and general-purpose applications. It offers a comprehensive suite of protection and diagnostics solutions, such as undervoltage lockout, overvoltage protection, overcurrent protection, and overtemperature protection, locking out hazardous conditions and protecting the load from faults. This regulator is also ideal for applications requiring an efficient high-accuracy regulator, such as automotive lighting, mobile displays, and more.

Working Principle

The ISL78171ARZ is an IC that can drive an LED while regulating the brightness. In general, the voltage applied to the LED is converted to the current that turns on the LED. This regulation can be done either by pulse width modulation (PWM) or by changing the output current. The ISL78171ARZ contains a current sensor that can detect the current in the LED and can adjust the output voltage of the device to regulate the LED’s brightness. The ISL78171ARZ will also compare the detected current to the set current and can adjust the voltage or the PWM frequency to maintain the LED at the set current.

The PWM used by this device is also adjustable and can range from 1kHz to 32kHz depending on what is needed for the application. In order to measure the current in each LED and get accurate voltage regulation, a unique current loop architecture is incorporated into the ISL78171ARZ. This architecture boosts the regulator’s dynamic performance by providing a fast transient response, line and load regulation, and wide input voltage range.

The ISL78171ARZ also features a set of protection functions that provide reliable and fail-safe operation of the ISL78171ARZ. The protection functions include overvoltage lockout, overcurrent protection, uvlo and overtemperature protection. All of these functions protect the device and the LED from unsafe operating conditions and potential fault conditions.

The ISL78171ARZ provides efficient and reliable LED dimming and lighting. The wide input voltage range and current loop architecture make it fit for driving a wide range of LED applications in automotive, industrial, and general-purpose applications. The protection functions also ensure robust and safe operation of the LED system.

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