This user's guide contains background information for the TPS54202 as well as support documentation for the TPS54202EVM-716 evaluation module (PWR716-001). Also included are the performance specifications, the schematic, and the bill of materials for the TPS54202EVM-716.

The TPS54202 dc/dc converter is designed to provide up to a 2-A output from an input voltage source of
8 V to 28 V. Rated input voltage and output current range for the evaluation module are given in Table 1-1. In order to reduce EMI, the TPS54202 introduces frequency spread spectrum. The jittering span is ±6% of the switching frequency with 1/512 swing frequency. This evaluation module is designed to demonstrate the small printed-circuit-board areas that may be achieved when designing with the TPS54202 regulator. The switching frequency is internally set at a nominal 500 kHz. The high-side and low-side MOSFETs are incorporated inside the TPS54202 package along with the gate-drive circuitry. The low drain-to-source on resistance of the MOSFETs allow the TPS54202 to achieve high efficiencies and helps keep the junction temperature low at high output currents. The compensation components are integrated to the integrated circuit (IC), and an external divider allows for an adjustable output voltage. Additionally, the TPS54202 provides an adjustable undervoltage lockout input. The absolute maximum input voltage is 30 V for the TPS54202EVM-716.

A summary of the TPS54202EVM-716 performance specifications is provided in Table 1-2. Specifications are given for an input voltage of V_IN = 24 V and an output voltage of 5.0 V, unless otherwise specified. The TPS54202EVM-716 is designed and tested for V_IN = 8 V to 28 V. The ambient temperature is 25°C for all measurements, unless otherwise noted.

These evaluation modules are designed to provide access to the features of the TPS54202. Some modifications can be made to this module.

The voltage divider, R2 and R3, is used to set the output voltage. To change the output voltage of the EVM, it is necessary to change the value of resistor R3. Changing the value of R3 can change the output voltage above 0.596 V. The value of R3 for a specific output voltage can be calculated using Equation 1. Use 100 kΩ for R2.

Equation 1.

Table 1-3 lists the R2 and R3 values for some common output voltages. Note that V_IN must be in a range so that the minimum on-time is greater than 150 ns. The values in Table 1-3 are standard values, not the exact value calculated using Equation 1.