參數(shù)資料
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
文件頁數(shù)： 43/98頁
文件大小： 2077K
代理商： TPS65800RTQTG4
www.ti.com
Batteryvoltage,
V(BAT)
Charge
Complete
Status,
Charger
Off
Pre-
conditioning
Phase
Current
Regulation
Phase
VoltageRegulationand
ChargeTermination
Phase
PRE-CHARGE
CURRENT AND
TERMINATION
THRESHOLD
BatteryCurrent,
I(BAT)
VO(BATREG)
V(LOWV)
T(PRECHG)
T(CHG)
FAST-CHARGE
CURRENT
IO(BAT)
IO(PRECHG) , I(TERM)
DONE
BAT
ISET 1
I
/K
(OUT)
(SET)
OUT
ChargeVoltage
Loop
Battery
Switch
SystemVoltage
RegulationLoop
VREF
Thermal
Loop
VTJ
V
(OUT)
I
(BAT)
V
(BAT)
V
O(REG)
V
O(REG)
SLVS606C – SEPTEMBER 2005 – REVISED FEBRUARY 2007
The charge parameters are selectable via I2C interface and using external components. The charge process
starts when an external input power is connected to the system, the charger is enabled by the I2C register
CHG_CONFIG bits CE=HI and CHGON=HI, and the battery voltage is below the recharge threshold, V(BAT) <
V(RCH). When the charge cycle starts a safety timer is activated. The safety timer timeout value is set by an
external resistor connected to TMR pin.
When the charger is enabled two control loops modulate the battery switch drain to source impedance to limit
the BAT pin current to the programmed charge current value (charge current loop) or to regulate the BAT pin
voltage to the programmed charge voltage value (charge voltage loop). If V(BAT) < 3 V (typ) the BAT pin current
is internally set to 10% of the programmed charge current value. A typical charge profile is shown below, for an
operation condition that does not cause the IC junction temperature to exceed 125
°C (typ).
Figure 34. Typical Charge Cycle, Thermal Loop not Active
If the operating conditions cause the IC junction temperature to exceed 125
°C the charge cycle is modified, with
the activation of the integrated thermal control loop. The thermal control loop is activated when an internal
voltage reference, which is inversely proportional to the IC junction temperature, is lower than a fixed,
temperature stable internal voltage. The thermal loop overrides the other charger control loops and reduces the
charge current until the IC junction temperature returns to 125
°C, effectively regulating the IC junction
temperature.
48
相關(guān)PDF資料
PDF描述
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