UC3845BDG

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UC3845BDG is a programmable DC/DC switching controller specifically designed for off-line and clock based switch-mode power supplies with minimum external components. It is also suitable for regulating applications involving power MOSFETs and IGBTs. It can also be used in several other applications such as low power converters, switch-mode amplifiers, and dimmers.

The UC3845BDG offers several programmable features that make it suitable for a variety of applications. It includes a precision reference voltage, up to 3.5A peak switch current limits and thermal shutdown. The chip also provides low quiescent current and a simple serial interface.

The UC3845BDG comes in a 8-pin SOICW package, or 8-pin PDIP package and has a temperature range of -40°C to +85°C. It requires a 3V to 40V DC supply voltage normally and a 2.9V to 15V DC supply voltage when restarting or under overload operation. It can operate at switching frequencies between 10kHz to 300kHz depending on the external components.

The UC3845BDG operates by comparing the feedback voltage from a control loop to a precision reference voltage along with an offset voltage. The output of the comparator drives an oscillator and a MOSFET driver. The oscillator determines the switching frequency, while the MOSFET driver provides the required power to the gate of the power MOSFET or IGBT. This application of the UC3845BDG includes the single and multiple pulse width modulation (PWM) control schemes.

The single pulse width modulation mode is used to regulate the average power output of a power supply. The output voltage is compared with the voltage of a reference feedback loop or a voltage divider. When the output voltage exceeds the reference, the power device is disabled to limit the output current.This is commonly used in buck, boost, and flyback converters.

The multiple pulse width modulation mode is used to control the output voltage regulation of a power supply. The advantages of multiple pulse width modulation over single pulse width modulation are higher switching efficiency, better load and line regulation, and lower component count. In multiple pulse width modulation applications, the control loop monitors the output voltage and adjusts the duty cycle of the switching waveform accordingly.

The UC3845BDG is a versatile, programmable DC/DC switching controller that can be used for a variety of applications. With its wide operating voltage range, precision reference voltage, and programmable features, it is suitable for high-power, low-power, regulating, and dimmer applications. Additionally, it has low quiescent current and a simple serial interface for ease of use.

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