The recommended PCB layout for the TDA4601 is to keep the input and output stages separate, with a ground plane in between to reduce noise and EMI. Additionally, the decoupling capacitors should be placed as close as possible to the IC pins.
The bootstrap capacitor value depends on the switching frequency, output voltage, and output current. A general rule of thumb is to choose a capacitor with a value between 10nF to 100nF. A larger capacitor value can reduce the voltage ripple, but may increase the start-up time.
The maximum allowed voltage on the bootstrap pin is typically around 35V, but it's recommended to keep it below 30V to ensure reliable operation and prevent damage to the IC.
The OCP feature is enabled by connecting the OCP pin to a resistor divider network that sets the current limit. The OCP threshold can be adjusted by changing the resistor values. It's recommended to set the OCP threshold around 10-20% above the maximum expected output current.
The soft-start pin is used to control the output voltage rise time during start-up. By connecting a capacitor and a resistor to the soft-start pin, you can adjust the rise time to prevent inrush currents and reduce EMI. A typical soft-start time is around 1-10ms.
