參數(shù)資料
型號： TPS65800RTQTG4
廠商： TEXAS INSTRUMENTS INC
元件分類： 電源管理
英文描述： 8-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC56
封裝： 8 X 8 MM, GREEN, PLASTIC, QFN-56
文件頁數(shù)： 40/98頁
文件大?。?/td> 2077K
代理商： TPS65800RTQTG4
www.ti.com
POWERPATH
CONTROL LOGIC
ACDETECTED
USBDETECTED
USBOVP
ACOVP
OUT SHORTED
BAT
SHORTED
OUT LOWER
THANBAT
V
BATSH
AC
USB
OUT
BAT
V
OVP
V
OVP
BAT
V
OUTSH
BAT
OUT
BAT
NOBATT
SHORT
DPPM
1V
Power Path Logic: Priority Algorithm
SLVS606C – SEPTEMBER 2005 – REVISED FEBRUARY 2007
Figure 32. TPS65800 Systems Status Detection, Charger and Power Path Section
Table 4 lists the system power detection conditions. VIN(DT), VOUTSH, VBATSH, VOVP are TPS65800 internal
references, refer to the electrical characteristics for additional details.
Table 4. System Status Detection, Charger and Power Path Section
AC input voltage detected
V(AC) – V(BAT) > VIN(DT)
USB input voltage detected
V(USB) – V(BAT) > VIN(DT)
AC overvoltage detected
V(AC) > VOVP
USB overvoltage detected
V(USB) > VOVP
AC PIN TO OUT pin OR USB TO OUT PIN short detected
V(OUT) < VINOUTSH
BAT pin to OUT pin short detected
V(BAT) - V(OUT) > VBATOUTSH
Battery supplement mode need detected
V(BAT) – V(OUT) > VSUP
Blank BAT to OUT short circuit detection
V(DPPM) < 1V
The system power bus supply is automatically selected by the power path control logic, following an internal
algorithm. The power path function detects an external input power connection when the input voltage exceeds
the battery pack voltage. It also detects a supplement mode need (battery switch must be turned ON) when the
system voltage (OUT pin) is below the battery voltage. A connected and non-selected external supply or the
battery is automatically switched to the system bus, following the priority algorithm, when the external supply
currently selected is disconnected from the system.
The input power priority is hard-wired internally, with the AC input having the higher priority, followed by the USB
input (2nd) and the battery pack (3rd). Using the I2C CHG_CONFIG register control bit CE the user can override
the power path algorithm, connecting the battery to the system power bus. Care must be taken when using the
battery to system connection option, as the system power bus is not connected back to the AC or USB inputs
(even if those are detected) when the battery is removed. Table 5 describes the priority algorithm.
45
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