参数资料
| 型号： | SC811ULTRT |
| 厂商： | Semtech |
| 文件页数： | 14/23页 |
| 文件大小： | 0K |
| 描述： | IC BATTERY MANAGEMENT |
| 标准包装： | 1 |
| 系列： | * |
| 其它名称： | SC811ULDKR |
SC811 / SC813
Applications Information (continued)
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R IPRGM or R IPUSB (k Ω ), R-tol = 1%
Figure 2a — Pre-charge Current and USB Low Power
Mode Fast-charge Current Tolerance vs. Programming
Resistance, Low Resistance Range
Pre-charge current regulation accuracy is dominated by
offset error. The range of expected pre-charge output
current versus programming resistance R IPRGM or R IPUSB is
shown in Figures 2a and 2b. Each figure shows the
nominal pre-charge current versus nominal R IPRGM or R IPUSB
resistance as the center plot and two theoretical limit plots
indicating maximum and minimum current versus
nominal programming resistance. These plots are derived
from models of the expected worst-case contribution of
error sources depending on programmed current. The
current range includes the uncertainty due to 1% toler-
ance resistors. The dots on each plot indicate the currents
obtained with standard value 1% tolerance resistors.
Figures 2a and 2b show low and high resistance ranges,
respectively.
Termination
When the battery voltage reaches V CV , the SC811/3 transi-
tions from constant current regulation to constant voltage
regulation. While V BAT is regulated to V CV , the current into
the battery decreases as the battery becomes fully
charged. When the output current drops below the termi-
nation threshold current, charging terminates. Upon
termination, the STATB pin open drain output turns off
and the charger either enters monitor state or float-
charges the battery, depending on the logical state of the
ENB input pin.
R IPRGM or R IPUSB (k Ω ), R-tol = 1%
Figure 2b — Pre-charge Current and USB Low Power
Mode Fast-charge Current Tolerance vs. Programming
Resistance, High Resistance Range
The termination threshold current is fixed at 10% of the
adapter mode fast-charge current, as programmed by the
resistance between IPRGM and GND, for all charging
modes. If only the USB modes will be used, the termina-
tion threshold current can be programmed independently
of the fast-charge current. (See the application sections,
Independent Programming of Termination Current, and
USB-only Charging of Very Large Batteries.)
Charger output current is the sum of the battery charge
current and the system load current. Battery charge
current changes gradually, and establishes a slowly
diminishing lower bound on the output current while
charging in CV mode. The load current into a typical
digital system is highly transient in nature. Charge cycle
termination is detected when the sum of the battery
charging current and the greatest load current occurring
within the immediate 300μs to 550μs past interval is less
than the programmed termination current. This timing
behavior permits charge cycle termination to occur
during a brief low-load-current interval, and does not
require that the longer interval average load current be
small.
Termination threshold current accuracy is dominated by
offset error. The range of expected termination current
versus programming resistance R IPRGM (for any charging
mode) is shown in Figures 3a and 3b. Each figure shows
? 2008 Semtech Corporation
14
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SC813 | 制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:Adapter/USB Tri-Mode Single-cell Li-ion Charger |
| SC813EVB | 制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:Adapter/USB Tri-Mode Single-cell Li-ion Charger |
| SC813M-PE-FOAM-BUTTON | 制造商:SUPER MICRO COMPUTER, INC. 功能描述:CSE-813MT-300CB FOAM SET BUTTON - Bulk |
| SC813M-PE-FOAM-TOP | 制造商:Supermicro Computer Inc 功能描述:CSE-813MT-300CB FOAM SET TOP - Bulk |
| SC813MT-300C | 制造商:Supermicro Computer Inc 功能描述:1U CHASSIS |
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