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參數(shù)資料
| 型號： | UCC2956 |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | Switch Mode Lithium-Ion Battery Charger Controller |
| 中文描述： | 開關(guān)式鋰離子電池充電控制器 |
| 文件頁數(shù)： | 5/10頁 |
| 文件大?。?/td> | 424K |
| 代理商： | UCC2956 |
5
UCC2956
UCC3956
APPLICATION INFORMATION (cont.)
tery voltage is above a user set threshold, the charger
will initiate a constant current bulk charge state. Once the
battery reaches 95% of it’s final voltage, the charger will
enter an over charge state. During the over charge state,
the converter will transition from a constant current to a
constant voltage mode of operation. Figure 2 shows typi-
cal current, voltage, and capacity levels of a Lithium-Ion
battery during a complete charge cycle.
A Block Diagram of the UCC3956 is shown on the first
page of the data sheet, while Figure 1 shows a typical
application circuit for a Buck derived
charger. The UCC3956 can be used for charging a single
cell or multiple cells in series. If more than two cells are
stacked in series, however, a level shifting gate drive will
be needed to operate the buck switch. The application
circuit charges a 1200mAh 2 cell stack at a 1C rate.
switch mode
Setting the Oscillator Frequency
The frequency of operation for the converter is set by
picking values for RSET and COSC.
fOSC=
3.475
(COSC+ 20pF)RSET
The UCC3956 is capable of operating at frequencies
higher than 200kHz. However, the actual operating fre-
quency of the buck converter will ultimately be deter-
mined by the usual tradeoffs of size, cost and efficiency.
The application circuit frequency is set at 100kHz with
COSC = 180pF and RSET = 162k.
Trickle Charge State
When the battery’s voltage is below a predetermined
threshold, the battery is either deeply discharged or has
shorted cells. The trickle charge state offers a low charg-
ing current to bring the battery up above zero capacity. In
the case of shorted cells, the trickle charge state pre-
vents the charger from delivering high currents during
this fault condition. Stacking several cells makes the de-
tection of a shorted cell more difficult.
For Lithium-Ion batteries, the trickle charge threshold is
typically set to a value around 2.5V per cell (this corre-
sponds to near zero capacity). When the cell voltage is
below the threshold, only a trickle current will be applied
to the battery. The threshold is established by program-
ming CHGENB to 2.05V when the battery (or stack) volt-
age is at the threshold. Referring to the application circuit
Figure 1. Typical Application Circuit
UDG-96198-1
I
BULK
= 1.2A
I
TRICKLE
= 90 mA
f
OSC
= 100kHz
Timeout = 120 minutes
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