ISL97635AIRZ-TK Integrated Circuits (ICs)

Voltage - Output:	34.5V
Base Part Number:	ISL97635
Supplier Device Package:	24-QFN-EP (4x4)
Package / Case:	24-VFQFN Exposed Pad
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 85°C (TA)
Applications:	Backlight
Dimming:	PWM
Frequency:	600kHz, 1.2MHz
Current - Output / Channel:	35mA
Series:	--
Voltage - Supply (Max):	24V
Voltage - Supply (Min):	6V
Number of Outputs:	6
Internal Switch(s):	Yes
Topology:	Step-Up (Boost)
Type:	DC DC Regulator
Part Status:	Active
Packaging:	Tape & Reel (TR)

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IntroductionThe ISL97635AIRZ-TK belongs to a family of programmable high-power LED drivers from Intersil Corporation, marketed under the ISLED family of products. It is one of the latest offerings from Intersil and is designed to meet the challenges of high-power LED lighting applications. The IC is a robust solution that is capable of driving up to six LEDs with up to 1Amp in each channel. It is designed to work with both single- and multi-channel LED drivers, allowing for flexible applications that demand higher luminance and better energy efficiency. This article will explore the application fields and working principles of the ISL97635AIRZ-TK. Application FieldThe ISL97635AIRZ-TK is suitable for a wide range of LED applications, ranging from automotive headlights to consumer and architectural lighting. Automotive headlight systems often require a high level of reliability and efficiency, while consumer and architectural lighting typically demand flexibility and smaller form factors. The ISL97635AIRZ-TK is designed to serve both markets, delivering excellent performance and reliability, while offering a wide range of programmable features. The IC is designed to drive up to six LEDs with up to 1Amp in each channel. It is optimized for single- or multi-channel LED operations, allowing for flexibility in terms of current and voltage levels. A wide operating range of 3V to 15V makes the IC suitable for both DC and AC line powered applications. The integrated programmable features of the IC make it ideal for applications that require adjustable inputs and outputs. It has a maximum PWM frequency of 1KHz and is capable of achieving high dimming resolution and fast response times. It also features a built-in open channel detection and fault protection, which eliminates the need for complex external circuitry. In addition, the IC is designed for integration with a wide variety of microcontrollers and SoCs. It is compatible with a wide range of microcontrollers, including 8-bit and 16-bit MCUs, and offers several levels of control and communication, with no additional MCU programming required. This makes it ideal for applications in which the LED driver needs to be integrated into an existing system. Working PrincipleThe ISL97635AIRZ-TK is a sophisticated IC that utilizes a variety of techniques to implement its LED driver functions. At its core, the IC employs a Pulse Width Modulated (PWM) dimming technique to provide adjustable current to each of the outputs. This technique uses the digital information within the IC to determine the duration of the voltage being output to the LED, which in turn determines the brightness level. The frequency of the PWM signal can be adjusted, allowing for different brightness levels. The IC features an integrated LED open-load protection. This feature detects when an LED is no longer receiving power and shuts off the power supply to that LED. This feature ensures that the LEDs are not left on at high current levels, which could potentially damage them. In addition, the IC has an active current balancing feature that can be used to achieve precise current control across each of the LEDs. This feature allows for precise current control in each of the channels, ensuring that the LEDs are receiving the correct amount of current for optimal performance. Finally, the IC also features a low power mode that reduces the power consumption of the output stages when the LEDs are not being driven. This feature helps to reduce heat dissipation, making the IC more energy efficient. ConclusionThe ISL97635AIRZ-TK from Intersil is a high-power LED driver that is ideally suited for a variety of LED lighting applications. It is designed to work with both single- and multi-channel LED drivers, allowing for flexible applications that demand higher luminance and better energy efficiency. It features a wide range of adjustable inputs and outputs, a maximum PWM frequency of 1KHz, and integrates LED open-load protection and active current balancing. These features make the IC an ideal solution for LED driver applications.

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