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參數(shù)資料
| 型號： | UB2012AG-S08-R |
| 廠商： | UNISONIC TECHNOLOGIES CO LTD |
| 元件分類： | 電源管理 |
| 英文描述： | POWER SUPPLY SUPPORT CKT, PDSO8 |
| 封裝： | HALOGEN FREE, SOP-8 |
| 文件頁數(shù)： | 2/17頁 |
| 文件大?。?/td> | 315K |
| 代理商： | UB2012AG-S08-R |
UB2012
Preliminary
LINEAR INTEGRATED CIRCUIT
UNISONICTECHNOLOGIESCO.,LTD
10 of 17
www.unisonic.com.tw
QW-R121-018 .b
APPLICATION INFORMATION(Cont.)
VOLTAGE REGULATION PHASE
The voltage regulation feedback is through the BAT pin. This input is tied directly to the positive side of the
battery pack. The UTC UB2012 monitors the battery-pack voltage between the BAT and VSS pins. According to the
voltage regulation, there are four versions of UTC UB2012, namely, 4.1 V, 4.2 V, 8.2 V and 8.4 V.
Other regulation voltages can be achieved by adding a voltage divider between the positive and negative
terminals of the battery pack and using UTC UB2012C or UTC UB2012D. The voltage divider presents scaled
battery-pack voltage to BAT input. (See Figure 7 and Figure 8) The resistor values RB1 and RB2 for the voltage
divider are calculated by the following equation:
1
-
)
V
×
(N
=
R
O(REG)
(CELL)
B2
B1
(2)
Where: N = Number of cells in series, V(CELL) = Desired regulation voltage per cell
CHARGE TERMINATION AND RECHARGE
The UTC UB2012 monitors the charging current during the voltage-regulation phase. The UTC UB2012
declares a done condition and terminates charge when the current tapers off to the charge termination threshold,
I(TERM). A new charge cycle begins when the battery voltage falls below the V(RCH) threshold.
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