SLVUAV5B March 2017 – February 2022 TPSM846C23
In order to operate the EVM, apply a valid input voltage of 4.5 V to 15 V. The power supply providing the input voltage must be rated for sufficient input current. The under voltage lock out (UVLO) can be programmed using the PMBus commands.
The output voltage is set at the factory to 0.6 V. It can be programmed over the allowable output voltage range by using the PMBus VOUT_COMMAND.
The TPSM846C23 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 TPSM846C23 EVM is set-up to operate at 500 kHz, but the switching frequency can be adjusted using the P2 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 the TPSM846C23 4.5-V to 15-V In, 0.35-V to 2-V Out, 35-A PMBus Power Module Data Sheet for further information on synchronization.
The TPSM846C23 EVM 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 TPSM846C23 4.5-V to 15-V In, 0.35-V to 2-V Out, 35-A PMBus Power Module 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.