TPS40170EVM-597: 5V @ 10A, 10 ~ 36V in, Buck

The TPS40170EVM-597 evaluation module (EVM) is a synchronous buck design providing a fixed 5-V output at up to 10-A load from a 10-V to 36-V input bus. The module uses the TPS40170 high performance, wide-input voltage, synchronous buck controller with CSD18537NQ5A and CSD18563Q5A power MOSFETs. This user's guide contains information for the TPS40170EVM-597 evaluation module (PWR597) including the performance specifications, schematic, and the bill of materials.

The TPS40170 DC-DC synchronous buck controller is designed for high efficiency from an input voltage source of 4.5 V to 60 V. The CSD18537NQ5A and CSD18563Q5A NexFET power MOSFETs are designed to minimize losses in power conversion applications. Rated input voltage and output current range for the evaluation module are given in Table 1. This evaluation module is designed to demonstrate the TPS40170, CSD18537NQ5A, and CSD18563Q5A in a typical wide-input bus converter application while providing a number of non-invasive test points to evaluate the performance and capabilities.

The control and gate drive circuitry is incorporated inside the TPS40170 package. The switching frequency is externally set at a nominal 300 kHz with a resistor to ground at the RT pin to reduce the size of output filter components. The hiccup current limit is externally set with an external resistor to ground at the ILIM pin and uses voltage sensing across the low-side MOSFET. The compensation components are external to the integrated circuit (IC), and an external resistor divider allows for an adjustable output voltage. Additionally, the TPS40170 provides an adjustable undervoltage lockout with hysteresis through an external resistor divider at the UVLO pin and adjustable soft-start with an external capacitor at the SS pin. The TRK pin can also be used to have the output voltage track an external reference. Lastly, the PGOOD pin is an integrated open drain output power good signal. The TPS40170EVM-597 has been evaluated up to a maximum input of 40 V.