ZHCSR16 September 2022 TPS544C26
ADVANCE INFORMATION
The TPS544C26 includes a fully integrated, internal, precision feedback divider and remote sense. Using both the selectable feedback divider and precision adjustable reference, output voltages up to 3.04 V can be obtained. The feedback divider can be programmed to divider ratios of 1:2 or 1:4 using the PROTOCOL_ID in register Section 7.6.63.
The recommended operating VOUT range is dependent upon the feedback divider ratio configured by PROTOCOL_ID as follows:
| VOUT_CTRL | VOUT Control Method | VOUT Step | Internal FB Divider Ratio | Recommended VOUT Range (V) |
|---|---|---|---|---|
| 00b | SVID only | 5 mV (PROTOCOL_ID = 01b or 10b) | 1:2 | 0.25 to 1.52 |
| 01b | SVID + I2C | |||
| 10b or 11b | I2C only | |||
| 00b | SVID only | 10 mV (PROTOCOL_ID = 00b or 11b) | 1:4 | 0.5 to 3.04 |
| 01b | SVID + I2C | |||
| 10b or 11b | I2C only |
Setting VOUT lower than the recommended range can negatively affect VOUT regulation accuracy. Setting VOUT above the recommended range is not achievable due to internal hardware limitation.
The TPS544C26 device offers true differential remote sense function which is implemented between VOSNS pin and GOSNS pin. The output of the differential remote sense amplifier is internally fed into the control loop and doesn’t come out to a package pin.
Differential remote sense function compensates a potential voltage drop on the PCB traces thus helps maintain VOUT accuracy under steady state operation and load transient event. Connecting the VOSNS pin and GOSNS pin to the remote location allows sensing the output voltage at a remote location. The connections from VOSNS pin and GOSNS pin to the remote location must be a pair of PCB traces with at least 12 mil trace width, and must implement Kelvin sensing across a high bypass capacitor of 0.1 μF or higher. The ground connection of the remote sensing signal must be connected to GOSNS pin. The VOUT connection of the remote sensing signal must be connected to VOSNS pin. To maintain stable output voltage and minimize the ripple, the pair of remote sensing lines must stay away from any noise sources such as inductor and SW node, or high frequency clock lines. It is recommended to shield the pair of remote sensing lines with ground planes above and below.
The recommended GOSNS operating range (refer to AGND pin) is ?100 mV to +100 mV. In case of local sense (no remote sensing), short GOSNS pin to AGND.