ZHCSHG3B november 2017 – july 2020 TPS254900A-Q1
PRODUCTION DATA
请参考 PDF 数据表获取器件具体的封装图。
To allow a charging port to renegotiate current with a portable device, the TPS254900A-Q1 device uses the OUT discharge function. During mode change, the TPS254900A-Q1 device turns off the power switch while discharging OUT with a 500-Ω resistance, then turning back on the power switches to reassert the OUT voltage.
When an OVP condition occurs on DP_IN or DM_IN, the TPS254900A-Q1 device enables an internal 200-kΩ discharge resistance from DP_IN to ground and from DM_IN to ground. The analog switches are also turned off. The TPS254900A-Q1 device automatically disables the discharge paths and turns on the analog switches once the OVP condition is removed.
When an OVP condition occurs on OUT, the TPS254900A-Q1 device turns on an internal discharge path (see Table 8-2 for the discharge resistance). The TPS254900A-Q1 device automatically turns off the discharge path and turns on the power switch once the OVP condition is removed.
| VIN(1) | EN(1) | OVP(1) | OUT DISCHARGE RESISTANCE(2) |
|---|---|---|---|
| 0 | 0 | 0 | — |
| 0 | 0 | 1 | 80 kΩ |
| 0 | 1 | 0 | — |
| 0 | 1 | 1 | 80 kΩ |
| 1 | 0 | 0 | 500 Ω |
| 1 | 0 | 1 | 500 Ω or 55 kΩ |
| 1 | 1 | 0 | — |
| 1 | 1 | 1 | 55 kΩ |