ZHCSHW4A December 2017 – January 2019 TPS23523
PRODUCTION DATA.
| PIN | TYPE | DESCRIPTION | |
|---|---|---|---|
| NAME | NO. | ||
| Neg48 | 1 | I | Input to the OR-ing controller for the –48 feed. The TPS23523 will regulate the drop from VEE to Neg48 to 25 mV to mimic an ideal diode. |
| NC | 2 | No connect to space high voltage pins. | |
| GATE2 | 3 | O | Gate driver for the 2nd hot swap FET. NC if feature isn’t used. |
| BGATE | 4 | O | Gate driver for the OR-ing FET. |
| VEE | 5 | GND | This pin corresponds to the IC GND. Kelvin sense to the bottom of RSNS to ensure accurate current limit. |
| SNS | 6 | I | Sense pin, used to measure current and regulate it. Kelvin Sense to RSNS to ensure accurate current limits. |
| GATE | 7 | O | Gate drive for the main hot swap FET. |
| SS | 8 | O | Pin used for soft starting the output. Connect a capacitor (CSS) between the SS pin and -48V_OUT. The dv/dt rate on the -48V_OUT pin is proportional to the gate sourcing current divided by CSS. |
| D | 9 | I | Pin used to sense the drain of the hot swap FET and to program the threshold where the hot swap switches from the CL1 and CL2. Connect a resistor from this pin to the drain of the hot swap FET (also called -48V_OUT) to program the threshold. |
| TMR | 10 | O | Timer pin used to program the duration when the hot swap FET can be in current limit. Program this time by adding a capacitor between the TMR pin and VEE. |
| OV | 11 | I | Input overvoltage comparator. Tie a resistor divider to program the threshold where the device turns off due to overvoltage event. |
| UVEN | 12 | I | Input undervoltage comparator. Tie a resistor divider to program the threshold where the device turns on. |
| VCC | 13 | S | Clamped supply. Tie to RTN through resistor. |
| PGb | 14 | O | Power Good Bar, which is an open drain output that indicated when the power is good and the load can start drawing full power. PGb goes low when the hot swap is fully on and the DC/DC can draw full power. |
| PROG | 15 | I | Adjust current limit and fast trip threshold by tying to VEE, floating, or tying to VEE through resistor. |
| Vref | 16 | O | 5V reference output. Connect to the base of a BJT to generate a rail that can be used to power current monitors and digital Isolators. |