Texas Instruments provides a recommended PCB layout in the TPS40001DGQR evaluation module documentation, which includes guidelines for component placement, thermal management, and routing. Following this layout can help minimize noise, reduce EMI, and ensure optimal performance.
The selection of input and output capacitors depends on the specific application requirements, such as ripple current, voltage rating, and ESR. TI recommends using low-ESR capacitors with a voltage rating of at least 1.5 times the maximum input voltage. The datasheet provides guidelines for capacitor selection, and TI's capacitor selection tool can also be used to find suitable components.
The TPS40001DGQR is rated for operation up to 85°C ambient temperature, but derating is required for reliable operation above 70°C. TI recommends following the thermal derating guidelines in the datasheet to ensure the device operates within its specified parameters.
The TPS40001DGQR has built-in OCP and SCP features. To implement these features, connect the OCP pin to a resistor divider network that sets the current limit, and connect the SCP pin to a capacitor that sets the short-circuit detection time. The datasheet provides detailed guidelines and equations for calculating the required component values.
To ensure proper startup, TI recommends a specific sequence: 1) Apply input voltage, 2) Wait for the internal voltage regulator to stabilize, 3) Apply the enable signal (EN pin), and 4) Wait for the output voltage to stabilize. The datasheet provides more detailed information on the startup sequence and timing requirements.
TPS40001DGQR datasheet
by Texas Instruments
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