参数资料
| 型号： | SC811ULTRT |
| 厂商： | Semtech |
| 文件页数： | 13/23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)
the resistance between IPRGM and GND according to the
equation
When either of the USB modes is selected, the pro-
grammed CC regulation fast-charge current is inversely
proportional to the resistance between IPUSB and GND
according to the equation
The fast-charge current can be programmed for a
minimum of 70mA and a maximum of 995mA for either
adapter or USB high power mode. This range for both
modes permits the use of USB high power mode for
general purpose adapter charging, allowing fully inde-
pendent programming of termination current. (See the
application sections, Independent Programming of
Termination Current, and USB-only Charging of Very
Large Batteries.)
Current regulation accuracy is dominated by gain error at
high current settings, and offset error at low current set-
tings. The range of expected fast-charge output current
versus programming resistance R IPRGM or R IPUSB (for adapter
or USB high power mode, respectively) is shown in Figures
1100
1050
1000
950
900
850
800
750
700
1a and 1b. Each figure shows the nominal fast-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 pro-
gramming 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% tolerance resis-
tors. The dots on each plot indicate the currents obtained
with standard value 1% tolerance resistors. Figures 1a
and 1b show low and high resistance ranges, respectively.
The USB low power mode fast-charge current accuracy is
exactly like that of pre-charge in high power mode. USB
low power mode current regulation accuracy is addressed
in the next section.
Pre-charge and USB Low Power Mode Fast-
charge Current Regulation
Pre-charging is automatically selected when the battery
voltage is below the pre-charge threshold voltage (VT PreQ ),
typically 2.8V. Pre-charge current conditions the battery
for fast charging. The pre-charge current value is fixed at
20% nominally of the fast-charge current. It is pro-
grammed by the resistance between IPRGM and GND for
adapter mode and USB high power mode, and by the
resistance between IPUSB and GND for USB low power
mode. Note that USB low power mode pre-charge current
is equal to USB low power mode fast-charge current.
325
300
275
250
225
200
650
175
600
550
150
500
125
450
400
350
300
100
75
250
2
2.5
3
3.5 4 4.5 5 5.5
R IPRGM or R IPUSB (k Ω ), R-tol = 1%
6
6.5
7
50
7
8
9
10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29
R IPRGM or R IPUSB (k Ω ), R-tol = 1%
Figure 1a — Fast-charge Current Tolerance versus
Programming Resistance, Low Resistance Range
Figure 1b — Fast-charge Current Tolerance versus
Programming Resistance, High Resistance Range
? 2008 Semtech Corporation
13
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相关代理商/技术参数 |
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| 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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