LT8391HFE#TRPBF

Series:	--
Packaging:	Tape & Reel (TR)
Part Status:	Active
Type:	DC DC Controller
Topology:	Step-Down (Buck), Step-Up (Boost)
Internal Switch(s):	No
Number of Outputs:	1
Voltage - Supply (Min):	4V
Voltage - Supply (Max):	60V
Voltage - Output:	60V
Current - Output / Channel:	--
Frequency:	150kHz ~ 650kHz
Dimming:	Analog, PWM
Applications:	Automotive, Lighting
Operating Temperature:	-40°C ~ 150°C (TJ)
Mounting Type:	Surface Mount
Package / Case:	28-TSSOP (0.173", 4.40mm Width) Exposed Pad
Supplier Device Package:	28-TSSOP-EP
Base Part Number:	LT8391

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LT8391HFE#TRPBF - PMIC - LED Drivers Application Field and Working Principle

Power management integrated circuits (PMIC) are analog microchips capable of regulating and providing power to various microelectronic devices such as LED drivers. LT8391HFE#TRPBF is a type of PMIC – LED driver which can be used to provide regulated power to LED lighting modules. In this article, the application fields and working principle of LT8391HFE#TRPBF will be discussed in detail.

Application Fields

LT8391HFE#TRPBF is capable of delivering up to 500 mA of constant current and up to 1.5A of peak current. With its wide input voltage range of 3V to 80V, it can be used in a variety of applications such as AC/DC LED lighting systems, automotive lighting systems and battery-operated lighting systems. Additionally, its high efficiency, low standby consumption and accurate current regulation makes it well suited for cost-sensitive applications. Furthermore, its small form factor of 2mm x 2mm in die size and advanced thermal performance makes it suitable for use in slim designs and tight spaces. Due to its highly integrated architecture, LT8391HFE#TRPBF helps to reduce number of components in a design and keep cost low, making it attractive for consumer electronics applications.

Working Principle

LT8391HFE#TRPBF adopts a peak current control technique to stabilize constant current across each LED string, even under varying voltage and temperature conditions. The proposed circuit comprises a charge pump, and a modulator to drive a field effect transistor (FET) at the output.The charge pump is responsible for generating a voltage drop to the input voltage while the modulator is used to control the conduction of the FET. The modulator implements a full-bridge circuit, comprising two NMOS and two PMOS transistors. The full-bridge modulator adjusts the duty cycle of FET to achieve accurate current regulation. In addition, LT8391HFE#TRPBF is equipped with a reference voltage circuit which ensures accurate current regulation against temperature and input voltage variations. The reference voltage circuit also provides a user-adjustable LED current by changing an external resistor.Furthermore, it is designed with an accurate programmable current detection and a linear dimming control block to reduce system cost. The programmable current detection is used to sense the LED current, and to adjust the dimming amplitude and switching frequency accordingly.

Conclusion

LT8391HFE#TRPBF is a type of PMIC – LED driver which can be used to provide regulated power to LED lighting modules. Its wide input voltage range of 3V to 80V and advanced thermal performance makes it suitable for use in a variety of applications such as AC/DC LED lighting systems, automotive lighting systems and battery-operated lighting systems. Its peak current control technique and programmable current detection help to achieve precise current regulation and dimming control, respectively.

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