4 Operation Notes

To operate the EVM, apply a valid input voltage from 4.5 V to 15 V. The power supply providing the input voltage must be rated for sufficient input current. The undervoltage lockout (UVLO) can be programmed using the PMBus commands.

The output voltage range is from 0.5 V to 2.0 V. The EVM can be evaluated at five popular output voltage settings by selecting a jumper (P1).

The TPSM846C24 is a 35-A device. When connecting the EVM to the external load, use wiring capable of safely handling 35 A of output current.

The Power-Good (PGOOD) indicator of the EVM will assert high when the output voltage is within ±5% of the programmed output voltage value. A 10-kΩ pullup resistor (R11) is populated between the PGOOD pin and the BP3 pin.

The TPSM846C24 EVM is set-up to operate at 500 kHz, but the switching frequency can be adjusted using the P3 jumper. If an exact switching frequency is required, the device can be synchronized to an external clock over the frequency range of 300 kHz to 1 MHz. Refer to TPSM846C24 4.5-V to 15-V Input, 0.5-V to 2.0-V Output, 35-A Power Module Data Sheet for further information on synchronization.

The TPSM846C24EVM-006 includes both input and output capacitors. The EVM includes footprints for adding additional input and output capacitors to the EVM. Adding additional capacitance will improve transient response. The actual capacitance required will depend on the input and output voltage conditions of the particular application, along with the desired transient response. Refer to the product data sheet for further information on input and output capacitance and transient response.

The EVM uses remote sense connections to regulate the output voltage at the output terminals of the EVM. The remote sense connections are made through 0-Ω resistors, R16 and R18. If remote sense is required at a different point, R16 and R18 can be replaced with 10-Ω resistors and VS+ and VS– test points can be extended to the new sense point.