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    Common Mistakes in Flyback Transformer Specs

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Torex Introduces Inductor Built-in Negative Output Voltage “micro DC/DC” Converters

21.11.2019
Reading Time: 2 mins read
A A

Torex Semiconductor Ltd. has launched the XCL303/XCL304 as a new series of inductor built-in negative output voltage“micro DC/DC” Converters.

The XCL303/XCL304 series are small coil-integrated negative voltage micro DC/DC converter IC. Increased oscillating frequency to 2.5MHz and by adopting the small package CL-2025-02(2.5 x 2.0 x 1.0mm), the mounting area is reduced by approximately 78% compared to general negative voltage output DC/DC(from 65.25mm2 to 14.43mm2). (see Fig.1. featured image)

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Further, integrating the coil together with the DC/DC simplifies the circuit board layout and minimizes potential noise interference. (Fig.2)

Fig2. Near Magnetic Field Noise of XCL303/XCL304 Series

Compared to a charge pump type solution, the switching method of the XCL303/XCL304 maintains a stable output voltage even when the input voltage fluctuates. In addition, this new micro DC/DC can support maximum output current 300mA (when VIN = 3.3V, VOUT = -3.0V).

The PWM controlled XCL303 series can be selected for applications where low noise is important, and the PWM/PFM automatic switching controlled XCL304 series can be selected for applications where high efficiency at light load current and low noise at high load current is important.The XCL303/XCL304 series allows users to select either a PWM control or PWM/PFM automatic switching control method, which are optimum for low noise and small negative voltage devices such as optical communication equipment.

Output voltage can be adjusted within the range of -1.2V to -6.0V using externally mounted resistors.

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Source: Torex Semiconductor Ltd.

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