ISL97677IRZ-T

Voltage - Output:	45V
Base Part Number:	ISL97677
Supplier Device Package:	32-QFN (5x5)
Package / Case:	32-VFQFN Exposed Pad
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 85°C (TA)
Applications:	Backlight
Dimming:	PWM
Frequency:	500kHz ~ 1.5MHz
Current - Output / Channel:	50mA
Series:	--
Voltage - Supply (Max):	26V
Voltage - Supply (Min):	4.75V
Number of Outputs:	8
Internal Switch(s):	Yes
Topology:	Step-Up (Boost)
Type:	DC DC Regulator
Part Status:	Obsolete
Packaging:	Tape & Reel (TR)

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Introduction

ISL97677IRZ-T is an LED driver, which is the abbreviation of a Power Management Integrated Circuit (PMIC). It is an integrated circuit (IC) that combines several power management functions and discrete transistors, diodes, linear and switching regulators and other components into a single package. LED drivers play an important role in driving LED loads and managing power requirements by providing power supply, LED brightness, LED dimming and LED heat dissipation.

ISL97677IRZ-T Application Field and Working Principle

ISL97677IRZ-T is applied in various LEDs, such as A-type, B-type, RGB, according to the complicated demands of illumination project. It can provide 4 different channels output current and support series connection. It can also provide 3 different programs of PWM dimming to meet the different requirements of LED dimming.The ISL97677IRZ-T LED Driver is built around a switching power converting technique, it employs a Buck converter circuit, also known as a closed loop switching power regulator. It works by first receiving an input voltage which is then converted by a high speed switch, a high side power MOSFET and a low side power MOSFET. This allows the circuit to regulate the output voltage by monitoring a signal from the output while maintaining a constant switching frequency once it reaches a steady state.The IC contains several main components, including a clock oscillator, two high-side MOSFETs, two low-side MOSFETs, two high-side drivers and two low-side drivers. It also has a linear regulator for device stabilization, a VDD monitor and a temperature monitor. The oscillator generates a signal applied to two high side drivers and two low side drivers to drive the two high side MOSFETs and two low side MOSFETs respectively. The two low side drivers switches the two low side MOSFETs on and off alternately and the high side drivers drives the two high side MOSFETs to turn on when the low side drivers turns off. So the inductor is charged and discharged cyclically, achieving the desired duty cycle. The duty cycle is determined by the clock frequency and the duty cycle setting voltage. A voltage-mode control loop is used to regulate the output voltage. The feedback signal is fed back to the PWM comparator, it compares the feedback signal with the compensation signal and changes the duty cycle to control the output voltage.Finally, the ISL97677IRZ-T LED Driver provides for programmable LED current, LED dimming and LED heat dissipation, ensuring stable LED operation and protection from various harmful conditions.

Conclusion

In conclusion, ISL97677IRZ-T LED Driver has a wide range of applications in illumination projects, such as A-type, B-type, RGB LEDs. It can provide 4 different channels output current and support series connection, as well as provide 3 different programs of PWM dimming. Furthermore, the integrated circuit offers programmable LED current, LED dimming and LED heat dissipation, ensuring stable LED operation and protection from various harmful conditions.

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