RACT25-1050

Voltage - Isolation:	3.75kV
Weight:	0.221 lb (100.24g)
Approvals:	CE
Mounting Type:	Chassis Mount
Size / Dimension:	4.72" L x 1.77" W x 1.10" H (120.0mm x 45.0mm x 28.0mm)
Termination Style:	Screw Terminal
Efficiency:	84%
Operating Temperature:	-20°C ~ 50°C
Ratings:	IP20
Features:	OCP, OTP, OVP, SCP
Dimming:	Triac
Series:	RACT25
Power (Watts):	25W
Current - Output (Max):	1.05A
Voltage - Output:	12 ~ 24V
Voltage - Input (Max):	264VAC
Voltage - Input (Min):	198VAC
Number of Outputs:	1
Topology:	AC DC Converter
Type:	Constant Current
Part Status:	Active

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LED Drivers - RACT25-1050 Application Field and Working Principle

Introduction

LED drivers are highly efficient DC-DC converters specifically designed for controlling the supply of power to LEDs. An LED driver is necessary for a number of applications, ranging from LED lighting to advanced display systems. Though LED drivers are not specifically necessary for low-power applications, for higher power applications, they are essential for optimal performance.The RACT25-1050 is a a 2-channel LED driver developed by Richtek Technology Corporation. It is a buck-boost LED driver featuring high-efficiency and low power dissipation. It is optimized for dimming applications such as street lighting, ambient light applications, automotive lighting and building lighting.

Application Field

The RACT25-1050 offers constant current output, adjustable to fit various LED strings. It offers a wide input voltage range and can accommodate up to two strings of LEDs, either in series or parallel. It is suitable for a variety of applications, including automotive lighting, street lighting and high bay lighting, among others.The device is also suitable for applications that require high power LED illumination. The RACT25-1050 has a wide operating temperature range of -40 to +125 degrees Celsius and comprehensive protection features, such as over temperature protection and over current protection.

Working Principle

The RACT25-1050 operates in buck-boost mode, meaning that the output voltage can be higher or lower than the input voltage depending on the load. The device has two voltage feedback terminals (VFB) which control the output voltage. The power delivered to the LED is regulated by sensing the voltage across an external current sensing resistor, and is controlled by an internal low-side current sense amplifier. This amplifier can detect a difference of only 1000mV between its two input pins. The device also has an integrated high-side N-MOSFET switch and driver.

Conclusion

The RACT25-1050 is an efficient 2-channel LED driver ideally suited for a wide range of applications. It features a wide operating temperature range, low power consumption and comprehensive protection features. The device is capable of providing constant current output, making it suitable for various LED strings. Furthermore, it operates in buck-boost mode, allowing it to accommodate both higher and lower output voltages relative to the input voltage.

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