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DC DC Converters

STMGFW152415 application field and working principle

The STMGFW152415 is a high performance, high efficiency DC/DC converter with advanced compensation circuit and peak current mode control. It is ideal for applications such as industrial automation, distributed power system, digital consumer electronics, and medical & measuring instrument.

The STMGFW152415 converter has a wide input voltage range of 4.5V to 16V and a typical efficiency of 97%. The part is housed in a low profile, 2.2 mm x 2.4 mm x 0.75 mm, 12-pin, small WLCSP package. It is a synchronous, step-down, fixed-frequency converter, providing up to 1.5A of continuous output current. The STMGFW152415 includes short-circuit, overload and over-temperature protections and a full-scale range of features for easy implementation.

Working Principle

The STMGFW152415 is a synchronous, step-down DC-DC converter with peak current mode control. It is a non-inverting buck converter, which means that the output voltage is equal to the input voltage less the dropout voltage of the internal MOSFET. The peak current mode control provides constant-frequency current mode operation, and the advanced compensation circuit eliminates the need for further external component compensation. It also provides low-voltage lockout and Pulse Frequency Modulation (PFM) for low noise, low power operation.

The STMGFW152415 includes an internal power MOSFET which allows the output voltage to remain constant across a wide input voltage range. The output voltage of the STMGFW152415 converter can be externally adjusted between 0.9V and VIN using an external resistor divider network.

The STMGFW152415 includes two main control blocks, the reference block and the main control block. The reference block contains an adjustable bandgap voltage reference and an error amplifier. The main control block contains a current sense amplifier, a peak current-control comparator, and an on-chip PWM generator. The PWM generator turns on the power MOSFET when the voltage across the current sense resistor reaches the threshold of the peak current control comparator.

Additionally, the STMGFW152415 includes several features to protect it from fast switching, over-current and over temperature. The fast-switch protection feature provides an adjustable delay time, which prevents the converter from turning on too quickly. The over-current protection feature monitors the output current to ensure that it never exceeds the set threshold value. Finally, the over-temperature protection feature is used to protect the converter from damage due to high junction temperature.

In summary, the STMGFW152415 is a high performance, high efficiency DC/DC converter with advanced compensation circuit and peak current mode control. It is an ideal solution for applications such as industrial automation, distributed power systems, digital consumer electronics, and medical & measuring instrument.

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