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(yè)數(shù)： 47/98頁(yè)
文件大?。?/td> 2077K
代理商： TPS65800RTQTG4
www.ti.com
BATTERY VOLTAGE REGULATION, CHARGE VOLTAGE
TEMPERATURE QUALIFICATION
DYNAMIC POWER PATH MANAGEMENT
V
DPPM + RDPPM
K
DPPM
I
DPPM
(5)
CHARGER OFF MODE
SLVS606C – SEPTEMBER 2005 – REVISED FEBRUARY 2007
Once termination is detected, a new charge cycle starts if the voltage on the BAT pin falls below the V(RCH)
threshold. A new charge start is also triggered if the charger is enabled/disabled/enabled via I2C (CHG_CONFIG
register bits CE or CHGON), or if both AC and USB input power are removed and then at least one of them is
re-inserted.
The termination is disabled when the thermal loop OR DPPM loop are active, and during supplement mode.
The voltage regulation feedback is Implemented by sensing the BAT pin voltage, which is connected to the
positive side of the battery pack. The TPS65800 monitors the battery-pack voltage between the BAT and
AGND1 pins, when the battery voltage rises to the VO(REG) threshold the voltage regulation phase begins and the
charging current tapers down.
The charging voltage can be selected as 4.2 V or 4.365 V (typ). The default power-up voltage is 4.2 V. As a
safety measure the 4.365 V charge voltage is programmed only if two distinct bits are set via I2C: VCHG = HI in
the CHG_CONFIG, and CHG_VLTG=LO in the GPIO3 register.
The TPS65800 continuously monitors battery temperature by measuring the voltage between the TS and
AGND1 pins. An internal current source provides the bias for a negative-temperature coefficient thermistor
(NTC), and the TS pin voltage is compared to the window set by internal thresholds VLTF and VHTF to determine
if charging is allowed. A voltage outside the VLTF to VHTF window is considered a temperature fault, and charge
is suspended. Charge resumes when the temperature returns to the valid window range.
With a 50-k
(at 25°C) thermistor, the valid temperature window is set between 0°C to 45°C. The temperature
window can be enlarged by adding external resistors to the TS pin application circuit.
Under normal operating conditions, the OUT pin voltage is regulated when the AC or USB pin is powering the
OUT pin and the battery pack is being charged. If the total (system + charge current) exceeds the available input
current, the system voltage drops below the regulation value.
The dynamic power path management function monitors the system output voltage. A condition where the
external input supply rating has been exceeded or the input current limit has been reached is detected when the
OUT pin voltage drops below an user-defined threshold, VDPPM:
where:
RDPPM = external resistor connected to DPPM pin
KDPPM = DPPM scaling factor
IDPPM = DPPM pin internal current source
To correct this situation the DPPM loop reduces the charge current, regulating the OUT pin voltage to the
user-defined VDPPM threshold. The DPPM loop effectively identifies the maximum current that can be delivered
by the selected input and dynamically adjusts the charge current to guarantee that the end equipment is always
powered. In order to minimize OUT voltage ripple during DPPM operation the VDPPM threshold should be set just
below the system regulation voltage.
If the charge current is reduced to zero by the DPPM and the input current is still lower than the OUT pin load,
the output voltage falls below the DPPM threshold, decreasing until the battery supplement mode is set [V(OUT)
= V(BAT) – VSUP(DT) ].
The TPS65800 charger circuitry enters the low-power OFF mode if both AC and USB power are not detected.
This feature prevents draining the battery during the absence of input supply.
51
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