STMicroelectronics provides a recommended layout and routing guide in their application note AN-2451, which includes guidelines for PCB design, component placement, and routing to ensure optimal performance and minimize noise.
The output capacitor selection depends on the output voltage, current, and ripple requirements. A general rule of thumb is to choose a capacitor with a capacitance value between 10uF to 100uF, and a voltage rating at least 1.5 times the output voltage. Additionally, consider the ESR (Equivalent Series Resistance) and ESL (Equivalent Series Inductance) of the capacitor to ensure it can handle the output current and frequency.
Although the datasheet specifies a maximum input voltage of 15V, it's recommended to derate the input voltage to 12V to 13V to ensure reliable operation and prevent damage to the device. Exceeding the maximum input voltage can lead to reduced performance, increased power consumption, or even device failure.
OVP can be implemented using an external voltage supervisor IC, such as the STMicroelectronics STM6627, which monitors the output voltage and shuts down the TS556CD if it exceeds a predetermined threshold. Alternatively, a simple voltage divider and comparator circuit can be used to detect overvoltage conditions and trigger a shutdown signal.
The thermal derating curve for the TS556CD is not explicitly provided in the datasheet. However, STMicroelectronics recommends following the general thermal derating guidelines for their DC-DC converters, which typically involve reducing the output current by 1-2% per degree Celsius above the maximum operating temperature (typically 125°C).
TS556CD datasheet
by STMicroelectronics
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