IS31FL3199-QFLS2-TR

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Integrated circuit (IC) LED Drivers have become the go-to solution for LED control since they are highly efficient, reliable, and have a small form factor. One such device is the IS31FL3199-QFLS2-TR IC LED driver, which is a charge-pump, 1-channel LED flash driver with ultra-low quiescent current. This IC is suitable for a variety of applications ranging from mobile phones, digital cameras, portable projectors, and portable video players.

Applications

The IS31FL3199-QFLS2-TR IC LED driver offers an efficient, flexible, small footprint solution for portable and handheld devices that require LED flash, indicator light, backlight, and driving circuits. It can be used in a wide range of applications including:

• Cell Phones & Smart Phones - the IC LED driver can be used in smartphones and digital cameras for LED flash, camera flash, and screen backlighting applications.
• Digital Cameras & Camcorders - the IC LED driver can be used in digital cameras and camcorders for LED flash, camera flash/illumination, and screen backlighting applications.
• Portable Video Recorders & Players - the IC LED driver can be used in portable video recorders and players for LED flash, camera flash/illumination, and screen backlighting applications.
• Portable Projectors - the IC LED driver can be used in portable projectors for LED flash, camera flash/illumination, and screen backlighting applications.

The IC LED driver has a wide operating voltage range and configurable current sinking capability which makes it compatible with a variety of applications. It is specifically designed to minimize power consumption while providing a reliable and consistent LED flash.

Features

The IS31FL3199-QFLS2-TR IC LED driver offers several features that make it a great choice for various applications:

• Charge-pump architecture offers higher efficiency, greater brightness, and improved durability over linear-based drivers.
• Integrated short-circuit protection for greater protection against damage.
• High voltage step-up transformer for improved reliability and performance in noisy environments.
• Dedicated open-drain output for low power standby mode.
• Integrated quiescent current control for low-power standby mode operation.
• Configurable peak current setting allows for better customization of LED flash.
• Configurable low-power standby current allows for more uniform LED flash.
• Low-noise operation at high frequency.
• Internal thermal shutdown protection.

Working Principle

The IS31FL3199-QFLS2-TR IC LED driver operates with a charge-pump switching regulator architecture. When the LED flash button is activated, the power switch is momentarily turned on and the charge pump\'s internal capacitor stores the energy. When the power switch is off, the energy is released to supply the LED, making the LED driver efficient even at low duty cycles. The device can operate with both short and long LED flash duty cycles.

The LED driver uses a step-up transformer for higher efficiency. When compared to linear drivers, the step-up transformer reduces the amount of power dissipated in the switching circuitry. This helps reduce power consumption and increase efficiency. The transformer also provides the necessary isolation for the driver and the LED, helping to increase reliability and reduce noise.

The IC LED driver also features an adjustable peak current setting which allows the user to achieve the desired LED brightness and power consumption. The low-quiescent current reduces power consumption in standby mode while the integrated open-drain output offers further power savings in low-power standby mode. The device also offers thermal shutdown protection, helping to protect the device and maintain stable operation.

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