ZHCSHW5A September 2017 – December 2017 TPS23521
PRODUCTION DATA.
| PIN | TYPE | DESCRIPTION | |
|---|---|---|---|
| NAME | NO. | ||
| NC | 1 | No connect. | |
| NC | 2 | No connect . | |
| GATE2 | 3 | O | Gate driver for the 2nd hot swap FET. NC if feature isn’t used. |
| NC | 4 | No connect. | |
| 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 over voltage comparator. Tie a resistor divider to program the threshold where the device turns off due to over voltage event. |
| UVEN | 12 | I | Input under voltage comparator. Tie a resistor divider to program the threshold where the device turns on. |
| VCC | 13 | S | Clamped supply. Tie to RTN through resistor. |
| NC | 14 | No connect. | |
| PROG | 15 | I | Adjust current limit and fast trip threshold by tying to VEE, floating, or tying to VEE through resistor. |
| Vref/PG | 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. It can also be used as a PG for the downstream DC/DC converters. |