LTC3783EFE#TRPBF

Voltage - Output:	--
Base Part Number:	LTC3783
Supplier Device Package:	16-TSSOP-EP
Package / Case:	16-TSSOP (0.173", 4.40mm Width) Exposed Pad
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 125°C (TJ)
Applications:	--
Dimming:	Analog, PWM
Frequency:	20kHz ~ 1MHz
Current - Output / Channel:	--
Series:	--
Voltage - Supply (Max):	36V
Voltage - Supply (Min):	3V
Number of Outputs:	1
Internal Switch(s):	No
Topology:	Flyback, SEPIC, Step-Down (Buck), Step-Up (Boost)
Type:	DC DC Controller
Part Status:	Active
Packaging:	Tape & Reel (TR)

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Introduction

The LTC3783EFE#TRPBF (LTC3783EFE) is a high-efficiency, high-power PMIC (Power Management IC) from Linear Technology. Designed for multiple-output LED applications requiring both constant current and constant voltage outputs, it is capable of driving up to four LED strings with up to 200mA of current. The LTC3783EFE also features low output ripple, built-in programmable soft-start and line/load regulation functions. When used in LED Drivers applications, the LTC3783EFE serves as a constant current source, providing highly reliable and accurate power to the LEDs.

Design

The LTC3783EFE is designed to reduce power dissipation, save board space and reduce cost. The device features a simple 4-pin SOT23 casted lead-frame package and can drive up to four LED strings. The device is capable of operating over a wide voltage range from 6.5 to 40V. The adjustable output voltage range is 3.2 to 40V. It can also provide up to 200mA of constant current output with a single resistor on the control pin.The LTC3783EFE can be used in a variety of applications, such as automotive, industrial, and lighting applications. The device is also capable of driving 12V and 24V LED strings.

Features

The LTC3783EFE has several features that make it suitable for a wide range of applications. These features include: - Over-Temperature Protection: The LTC3783EFE features built-in Overtemperature Protection that ensures no damage to the circuit.- Pre-Biasing Output Protection: The LTC3783EFE features pre-biasing output protection that prevents damage to the circuit when the input voltage is applied before the output voltage.- Over-Current Protection: The LTC3783EFE features adjustable Over-Current Protection that prevents the device from short-circuiting or over-driving the LED strings.- Soft-Start: The LTC3783EFE also features adjustable Soft-Start, which prevents inrush current and helps in slowly ramping up the output current.- Output Ripple: The LTC3783EFE also features a low output ripple of less than 100mV.- Programmable: The LTC3783EFE can be programmed through its control pin with a single resistor.

Applications

The wide range of features offered by the LTC3783EFE make it suitable for a variety of applications. These applications include: - Automotive Lighting Applications: The LTC3783EFE can be used to drive a wide variety of automotive lighting applications such as interior lights, exterior lights, and dashboard lights. - Industrial Lighting Applications: The LTC3783EFE can be used to drive a wide variety of industrial lighting applications such as task lighting, flood lighting, and security lighting. - Flat Panel Displays and Tablets: The LTC3783EFE can be used for flat panel displays and tablets as it can be programmed to a wide variety of dimming levels. - LED Displays: The LTC3783EFE can be used to drive LED displays such as billboard displays and digital signs.

Working Principle

The LTC3783EFE is designed to provide a constant current source to the LED strings. It contains an oscillator, current sense circuitry and a power switch that are all connected to each other to form a complete circuit.When an input voltage is applied to the device, the oscillator generates an alternating current signal. This signal is then used to drive an internal power switch. The power switch allows the current to flow through each LED string, controlling the LED brightness. The current sense circuitry measures the current through the LED strings and adjusts the duty cycle of the oscillator to maintain the desired current. This helps to ensure that the LED strings are illuminated with a consistent current.

Conclusion

The LTC3783EFE is a high-efficiency, high-power PMIC (Power Management IC) from Linear Technology that is suitable for multiple-output LED applications requiring both constant current and constant voltage outputs. The device features a simple 4-pin SOT23 casted lead-frame package and is capable of driving up to four LED strings. It also features built-in features like over-temperature protection, pre-biasing output protection, adjustable over-current protection, adjustable soft-start and low output ripple that make it suitable for a wide range of applications. The LTC3783EFE is designed to provide a constant current source to the LED strings. It contains an oscillator, current-sense circuitry and a power switch that all work together to maintain a consistent current to the LED strings. The device is suitable for automotive, industrial and lighting applications and is capable of driving 12V and 24V LED strings.

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