SLVUB26D May 2017 – February 2022 TPSM846C23
Wire-loop test points and scope probe test points are provided as convenient connection points for digital voltmeters (DVM) or oscilloscope probes to aid in the evaluation of the device. Table 3-1 provides a description for each test point.
| VIN | Input voltage monitor. Connect DVM to this point for measuring efficiency. |
| VS+ | Supply path output voltage monitor. Connect the DVM positive lead to this point for line regulation and load regulation. |
| VS– | Return path output voltage monitor. Connect the DVM negative lead to this point for measuring line regulation and load regulation. |
| VOUT | Output voltage monitor. Connect DVM to this point and PGND for measuring efficiency. |
| PGND | Input and output voltage monitor grounds. Reference the VIN and VOUT DVMs to these ground points. |
| VIN MON (J1) | Input voltage scope monitor. Connect an oscilloscope to this set of points to measure input ripple voltage. |
| VOUT MON (J2) | Output voltage scope monitor. Connect an oscilloscope to this set of points to measure output ripple voltage and transient response. |
| AGND | Analog ground point. Use any of the AGND test points as the ground reference for the control signals. |
| ALERT | PMBus ALERT line, used to monitor the ALERT signal. |
| CLK | PMBus CLK line, used to monitor the CLK signal. |
| DATA | PMBus DATA line, used to monitor the DATA signal. |
| CNTL | Control pin. Pull to AGND to stop power conversion. Float or pull to 3.3 V to enable power conversion. An internal 10-kΩ pullup resistor to 3.3 V is present on the EVM. |
| EXT CLK | External clock input. This is the input to a D flip-flop. Apply an external clock at a frequency that is twice the required switching frequency. Remove R13 before applying the clock signal. |
| SYNC | SYNC monitor pin. This pin is the output of a D flip-flop which supplies a clock to both devices. |
| PGOOD | Monitors the power-good signal of the device. This is an open-drain signal that has an on-board 10-kΩ pullup resistor to 3.3 V. |
| DIFFO | Output of remote sense differential amplifier |
| Signal | Signal injection point for Bode plot analyzer. Inject from Signal to CHB. |
| CHA | Input signal monitoring point for Bode plot analyzer |
| CHB | Output signal monitoring point for Bode plot analyzer |
| PH1 | Switch node of the TPSM846C23 controller device (U1). Use an unshielded scope probe to monitor this point. |
| PH2 | Switch node of the TPSM846C23 follower device (U2). Use an unshielded scope probe to monitor this point. |
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 absolute maximum ratings associated with features in Table 3-1.