REC15-4815D/H3

DC DC converters provide an effective way to convert DC voltage from one level to another level, and the REC15-4815D/H3 is an example of such converters. It is a switch-mode DC DC converter that is used to integrate into small size systems due to its high efficiency and low heat dissipation. This device can be used for 0.5V to 48V output voltage range, 15 Watt output power and a wide 4:1 input voltage range of 9V to 36V.

Application Field

The REC15-4815D/H3 DC DC converter is primarily used for portable battery-powered applications such as tablets, mobile phones, and wearable devices. It also finds applications in energy management and power over Ethernet (PoE) systems such as 12V/24V automotive, CCTV/gateway systems, server/embedded systems, and industrial control systems.

Working Principle

The REC15-4815D/H3 DC DC converter works on the switch-mode topology explained in detail by Stephen V Holdich in his book Switch Mode Power Supplies: A Practical Design Guide. It works on the principle of controlling switch duty cycle to regulate the amount of power delivered from input to output. The converter uses a high side transistor and a low side transistor to short out an input to output voltage. This allows the device to control the voltage and current changes and avoid oscillation through the switch leg.

More specifically, the converter uses synchronous rectification to improve its overall efficiency. This is a technique that utilizes high-side and low-side MOSFETs with parallel diode to provide ZVS and ZCS (Zero Volt Switching and Zero Current Switching). This makes the device more efficient and reduces conducted noise. Furthermore, the device also includes integrated features such as power-good signal, choose-by-voltage jumpers, programmable current limit, programmable soft-start, and remote on-off with O-ring diode.

To ensure safety in the application, the device has protection features such as over-current protection (OCP) which turns off the output voltage when the current drawn from the output surpasses the set OCP threshold, over-voltage protection (OVP) which shuts down the output if the voltage exceeds its set limit, and under-voltage lockout (UVL) which shuts down the output if the input voltage falls below its lower limit.

Conclusion

The REC15-4815D/H3 DC DC converter is a widely used DC DC converter solution that is primarily used in portable battery powered applications. It is a switch-mode DC DC converter that works on the switch-mode topology and utilizes synchronous rectification to enhance its efficiency. In addition, the device also has various integrated and protection features to ensure the product’s safety and reliability in its various applications.