The maximum operating frequency of UC3846DWG4 is 500 kHz, but it can be adjusted using the RT/CT pin. However, it's recommended to operate at a frequency below 400 kHz for optimal performance.
The minimum input voltage is typically 8.5V, and the maximum input voltage is 18V. However, the recommended operating range is 12V to 15V. You can calculate the minimum input voltage using the formula: Vin(min) = Vcc + (Vsat + Vf) + (Iout * Rl), where Vsat is the saturation voltage, Vf is the forward voltage drop, Iout is the output current, and Rl is the load resistance.
The RT/CT pin is used to set the oscillator frequency and timing. You can connect a resistor (RT) and a capacitor (CT) in series between the RT/CT pin and ground to set the oscillator frequency. The formula to calculate the oscillator frequency is: f = 1.4 / (RT * CT). You can also use the RT/CT pin to synchronize the oscillator with an external clock signal.
To ensure stability and prevent oscillations, make sure to follow the recommended layout and grounding guidelines, use a sufficient decoupling capacitor (typically 10uF to 22uF) between the Vcc and ground, and add a small capacitor (typically 10nF to 100nF) between the output and ground. Additionally, ensure that the input voltage is within the recommended range, and the output current is within the specified limits.
The maximum output current of UC3846DWG4 is 1A. You can calculate the maximum output current using the formula: Iout(max) = (Vin - Vsat) / Rl, where Vin is the input voltage, Vsat is the saturation voltage, and Rl is the load resistance. However, it's recommended to derate the output current by 20% to 30% to ensure reliable operation.
UC3846DWG4 datasheet
by Texas Instruments
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