CAT4238AGEVB

Series:	--
Part Status:	Active
Lead Free Status / RoHS Status:	--
Current - Output / Channel:	40mA
Moisture Sensitivity Level (MSL):	--
Outputs and Type:	1, Non-Isolated
Voltage - Output:	--
Features:	Dimmable
Voltage - Input:	2.8 V ~ 5.5 V
Supplied Contents:	Board(s)
Utilized IC / Part:	CAT4238

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What is CAT4238AGEVB Evaluation Board?

The CAT4238AGEVB Evaluation Board is a LED driver based on the CAT4238A, which is an integrated step-up DC-DC converter. It is designed to drive white LED strings in backlighting applications from DC supplies up to 16 V. This evaluation board can provide 10 to 20 W of power for lighting displays with a wide range of brightness levels.

CAT4238AGEVB Application Field

The CAT4238AGEVB Evaluation Board is ideal for various application fields. Firstly, it is widely used in LCD/LED backlighting designs. As a step-up DC-DC converter, the CAT4238A provides an adjustable output current across the LED string with high efficiency, thus helping to reduce humidity, heat and power dissipation, and providing increased luminance. Secondly, it is also applicable in general lighting designs, thanks to its dimming feature which can be controlled by a simple external potentiometer. Additionally, the board also functions well in automotive designs, providing high efficiency and simplified thermal design.

CAT4238AGEVB Working Principle

The CAT4238AGEVB Evaluation Board is based on the CAT4238A IC, which has a synchronous rectification design, allowing it to offer higher efficiency than competing solutions. It can also provide significantly lower levels of input and output ripple compared to alternative solutions for the same load and topology design. The CAT4238A also features an internal N-channel MOSFET switch, making it ideal for driving LEDs from low voltage DC supplies.The CAT4238AGEVB uses the N-channel MOSFET to control the output current and dimming level. When the MOSFET is on, the LED string is connected and current is drawn from the input source. When the MOSFET is off, the LED string is disconnected, the current is drawn from the output capacitor, and the LED output is kept constant.The CAT4238A allows an adjustable output current with a range of 0.1 up to 2 A, dependant on the values of the external components chosen. The output current of the LED string is determined by an external resistor, known as the sensing resistor, which provides a voltage at its output proportional to the load current. This is then compared to the PWM signal from the CAT4238A and the appropriate duty cycle is then applied to the external MOSFET switch to maintain the desired output current.

Conclusion

The CAT4238AGEVB Evaluation Board is a powerful LED driver that is suitable for a wide range of application fields, including LCD and LED backlighting, general lighting and automotive designs. Its high efficiency and low ripple levels make it ideal for these applications. The board contains the CAT4238A IC, which is a synchronous rectifier, and an included N-channel MOSFET switch, which allows it to be used to drive LEDs from low voltage DC supplies. Finally, it can provide an adjustable output current with a range of 0.1 up to 2A.

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