R-78T3.3-1.0/AC-R

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DC DC Converters

The R-78T3.3-1.0/AC-R is a DC/DC converter manufactured by Murata. It is a step-up DC/DC converter with three input voltage ranges and 12 output power ratings. The device features a fixed-frequency current-mode control, minimal external components, and a wide range of operating temperature. It is suitable for automotive applications, instrumentation, and communication systems.

Application Field

The R-78T3.3-1.0/AC-R is used in automotive, instrumentation, and communication applications. It is used to convert a nominal input voltage of 24 VDC to a nominal output voltage of 3.3 VDC with a current rating of 1.0A. The output voltage can be adjustable over a range depending on the version. It also features an operating temperature range of -40°C to 125°C, a wide output voltage range, and a broad input voltage range. This makes it an ideal choice for automotive, instrumentation, and communication applications.

Working Principle

The R-78T3.3-1.0/AC-R is a buck-boost converter. It uses an internal switching regulator, which switches the current flowing from the input voltage to regulate the output voltage. The regulator is controlled by a fixed frequency current mode control. This allows the converter to achieve a high power efficiency and fast transient response. The output voltage is adjustable by a voltage divider composed of feedback resistor Rf and external divider resistor Rd. The output voltage can be set by adjusting the ratio of the two resistors.

The R-78T3.3-1.0/AC-R also features soft-start, over-current protection, and thermal protection. The soft-start function limits the power dissipation at start-up. The over-current protection functions by stopping the switching cycle when the output current is larger than the predetermined level. The thermal protection stops the device when the power dissipation is too high, which prevents the device from automatic restart when the power dissipation has gone down.

In conclusion, the R-78T3.3-1.0/AC-R is a step-up DC/DC converter designed for automotive, instrumentation, and communication applications. It features a fixed-frequency current-mode control, minimal external components, a wide output voltage range, a broad input voltage range, and a wide operating temperature range. It also features soft-start, over-current protection, and thermal protection. This makes the R-78T3.3-1.0/AC-R an ideal choice for many different applications.

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