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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)： | 7/17頁 |
| 文件大?。?/td> | 315K |
| 代理商： | UB2012AG-S08-R |
UB2012
Preliminary
LINEAR INTEGRATED CIRCUIT
UNISONICTECHNOLOGIESCO.,LTD
15 of 17
www.unisonic.com.tw
QW-R121-018 .b
APPLICATION INFORMATION(Cont.)
SELECTING INPUT CAPACITOR
In most applications, a high-frequency decoupling capacitor is required. A 0.1μF ceramic, placed in proximity to
VCC and VSS pins, works well. The UTC UB2012 works with both regulated and unregulated external dc supplies. If
a non-regulated supply is chosen, the supply unit should have enough capacitance to hold up the supply voltage to
the minimum required input voltage at maximum load, otherwise more capacitance must be added to the input of the
charger.
SELECTING OUTPUT CAPACITOR
For loop stability, the UTC UB2012 does not require any output capacitor. However, when a battery is not
present, the user can add output capacitance in order to control the output voltage. The charger quickly charges the
output capacitor to the regulation voltage, but the output voltage decays slowly, because of the low leakage current
on the BAT pin, down to the recharge threshold. Addition of a 0.1μF ceramic capacitor, for instance, results in a 100
mV (pp) ripple waveform, with an approximate frequency of 25Hz. Higher capacitor values can be used if a lower
frequency is desired.
AUTOMATIC CHARGE-RATE COMPENSATION
In order to compensate safely for internal impedance of the battery pack, the UTC UB2012 uses the automatic
charge-rate compensation technique to reduce charging time. The automatic charge-rate compensation feature is
disabled by connecting the COMP pin to VCC in current-sensing configuration.
Figure 12 outlines the main components of a single-cell Li-Ion battery pack. The Li-Ion battery pack consists of a
cell, protection circuit, fuse, current sense-resistors, connector, and some wiring. There are some resistances in
each of these components. Total impedance of the battery pack is equal to the sum of the minimum resistances of
all battery-pack components. Using the minimum resistance values reduces the odds for overcompensating.
Overcompensating may activate the safety circuit of the battery pack.
BAT+
Terminal
Fuse
BAT-
Wire
Terminal
Discharge
Charge
Wire
Cell
Wire
Protection
Controller
Figure 10 Typical Components of a Single-Cell Li-lon Pack
Compensation is achieved through input pin COMP (Figure 13). A portion of the current-sense voltage,
presented through this pin, is scaled by a factor of G(COMP) and summed with the regulation threshold, VO(REG). This
process increases the output voltage to compensate for the battery pack’s internal impedance and for undesired
voltage drops in the circuit.
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