The recommended operating voltage range for UC3845NG4 is 12V to 28V, with a maximum rating of 30V. However, it's essential to ensure that the voltage supply is well-regulated and filtered to prevent noise and oscillations.
The value of the timing capacitor (CT) depends on the desired oscillator frequency. A smaller CT value results in a higher frequency, while a larger value results in a lower frequency. A good starting point is to use the values recommended in the datasheet (e.g., 220pF to 470pF for a 50kHz to 100kHz frequency range).
The soft-start pin (SS) is used to gradually increase the output voltage during startup, reducing inrush currents and preventing voltage overshoots. To use it, connect a capacitor (typically 10nF to 100nF) from the SS pin to ground, and a resistor (typically 1kΩ to 10kΩ) from the SS pin to the output voltage. This creates a ramp-up time of around 1ms to 10ms.
To ensure stability, follow these guidelines: 1) Use a well-regulated and filtered input voltage, 2) Choose the right value for the timing capacitor (CT), 3) Ensure the output voltage is properly decoupled with capacitors, 4) Use a low-ESR output capacitor, and 5) Avoid long PCB traces and minimize parasitic inductances.
The UC3845NG4 is a controller IC and does not have an internal power switch. Therefore, the maximum output current depends on the external power switch (e.g., MOSFET or BJT) used in the design. Ensure that the power switch is rated for the desired output current and that the UC3845NG4 is properly configured to drive it.
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