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| 型號(hào)： | 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(yè)數(shù)： | 41/98頁(yè) |
| 文件大小： | 2077K |
| 代理商： | TPS65800RTQTG4 |
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Input Current Limit
System Voltage Regulation
Input Overvoltage Detection
Output Short-Circuit Detection
Battery Short Circuit Detection
SLVS606C – SEPTEMBER 2005 – REVISED FEBRUARY 2007
Table 5. Power Path Control Logic Priority Algorithm
CE BIT
EXTERNAL SUPPLY
SWITCH MODE
SYSTEM POWER
(I2C CHG_CONFIG Register)
DETECTED
SOURCE
AC
USB
AC
USB
Battery
HI
YES
NO
ON
OFF
ON if Supplement mode is
AC
required, OFF otherwise
NO
YES
OFF
ON
USB
YES
ON
OFF
AC
NO
OFF
BATTERY
LO
XX
OFF
ON
BATTERY
The power path status is stored in register CHG_STAT.
The USB input current is limited to the maximum value programmed by the host, using the I2C interface. If the
system current requirements exceed the input current limit, the output voltage collapses, the charge current is
reduced, and finally the supplement mode is set. The input current limit value is set with the I2C charge control
register bits PSEL and ISET2, and it is applied to the USB input ONLY. The AC input current limit is fixed to the
internal short circuit limit value.
Table 6. Charge Current Scaling via I2C
PSEL (I2C)
ISET2 (I2C)
INPUT CURRENT LIMIT
USB
AC
LO
100 mA
2.75 A
LO
HI
500 mA
2.75 A
HI
LO
2.75 A
HI
2.75 A
The system voltage is regulated to a fixed voltage when one of the input power supplies is connected to the
system. The system voltage regulation is implemented by a control loop that modulates the selected switch
Rds(on).
The typical system regulation voltage is 4.6 V.
The AC and USB input voltages are monitored by voltage comparators that identify an overvoltage condition. If
an overvoltage condition is detected a status register bit is set, indicating a potential fault condition.
When an overvoltage condition is detected the AC or USB switches state is not modified. If any of those
switches was ON, it is kept in the ON state. During overvoltage conditions, the system voltage still is regulated,
and no major safety issues are observed when not modifying the input switch state.
If the input overvoltage condition results in excessive power dissipation, the thermal shutdown circuit is
activated, the AC and USB switches are turned OFF, and the BAT switch is turned ON.
If the OUT pin voltage falls below an internal threshold VINOUTSH the AC and USB switches are turned off and
internal pullup resistors are connected from AC pin to OUT pin and USB pin to OUT pin. When the short circuit
is removed those resistors enable the OUT pin voltage to rise above the VINOUTSH threshold, returning the
If the OUT pin voltage falls below the BAT pin voltage by more than an internal threshold VBATOUTSH the battery
switch is turned off and internal pullup resistor is connected between the OUT pin and the BAT pin. This resistor
enables detection of the short removal, returning the system to normal operation.
46
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