JTB0348D15

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DC–DC converters are electronic power conversion devices designed to alter the voltage level of a DC source. The JTB0348D15 is a highly efficient module consisting of step-up DC–DC converter and a low drop-out (LDO) regulator. With its high efficiency and medium power rating, the JTB0348D15 is suitable for a variety of applications, such as notebook PCs, industrial power supplies, set top boxes, and Wireless LAN.

Applications for JTB0348D15

The JTB0348D15 offers excellent performance in applications requiring high input voltage, high efficiency, and medium power output. Some example applications are:

• Notebook PCs
• Industrial power supplies
• Set-top boxes, VoIP phones, Modems
• Wireless LAN and WAN equipment
• Digital video/audio equipment

Working Principle of JTB0348D15

The JTB0348D15 utilizes two separate circuits to provide output power from an input voltage. The first is a step-up DC-DC converter, which takes in a low input voltage (for example 5V) and increases it to a higher voltage (for example 12V). The second is a low drop-out (LDO) regulator, which is used to built a simple output voltage feedback circuit with better stability.

The step-up DC–DC converter utilizes a high-frequency switching regulator, which is responsible for the conversion from the low input voltage to the desired higher output voltage. The switching regulator is controlled by an internal PWM controller. When the input voltage is higher than the output voltage, the PWM controller will turn on the switch, and the current will flow from the input to the output. When the input voltage is lower than the output voltage, the switch will be turned off, and the energy stored in the inductor will be released to the output.

The low drop-out (LDO) regulator is used to adjust the output voltage to ensure steadiness. It utilizes an error amplifier that compares the output voltage with the reference voltage and controls the gate voltage of a pass transistor. When the output voltage is lower than the reference voltage, the error amplifier will increase the gate voltage of the pass transistor to lower the output voltage. Otherwise, the error amplifier will decrease the gate voltage to maintain the output voltage.

Conclusion

The JTB0348D15 is a highly efficient module comprised of a step-up DC–DC converter and a low drop-out regulator. With its high efficiency, medium power rating, and a wide range of applications, it is an ideal choice for many portable electronic devices.

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