参数资料
| 型号： | MC33340EVB |
| 厂商： | ON Semiconductor |
| 文件页数： | 7/16页 |
| 文件大小： | 0K |
| 描述： | EVAL BOARD FOR MC33340 |
| 产品变化通告： | Product Obsolescence 14/Apr/2010 |
| 设计资源： | MC33340EVB BOM MC33340EVB Gerber Files MC33340EVB Schematic |
| 标准包装： | 1 |
| 主要目的： | 电源管理，电池充电器 |
| 嵌入式： | 否 |
| 已用 IC / 零件： | MC33340 |
| 已供物品： | 板 |
| 其它名称： | MC33340EVBOS |
MC33340, MC33342
Negative slope voltage detection starts after 60 ms have
elapsed in the fast charge mode. This does not affect the
Fast/Trickle output until the holdoff time (t hold ) has elapsed
during the fast charge mode. Two scenarios then exist.
Trickle mode holdoff is implemented to ignore any initial
drop in voltage that may occur when charging batteries that
have been stored for an extended time period. If the negative
slope voltage detector senses that initial drop during the
holdoff time, and the input voltage rises as the battery
charges, the Fast/Trickle output will remain open. However,
if the negative slope voltage detector senses a negative drop
in voltage during the holdoff time and the input voltage
never rises above that last detected level, the Fast/Trickle
output will latch into a low state. The negative slope voltage
detector has a maximum resolution of 2.0 V divided by
1023 mV, or 1.955 mV per count with an uncertainty of
± 1.0 count. This yields a detection range of 1.955 mV to
5.865 mV. In order to obtain maximum sensing accuracy,
the R2/R1 voltage divider must be adjusted so that the V sen
input voltage is slightly less than 2.0 V when the battery pack
is fully charged. Voltage variations due to temperature and
cell manufacturing must be considered.
Battery Detect
V sen
Input
Synchronous
Voltage to
Frequency
Converter
F V = V sen (24 kHz)
Ck
Rachet
Counter
? D V
Low
High UVLO
Logic
F/T
Trickle Mode
Holdoff
Over Under Charge
Temperature Timer
V sen Gate
SCK
95 kHz
Sample
Timer
V sen Gate
1.38 s
Preset
11 ms
Convert
22 ms
Rachet Counter Convert
0 to 1023 F V Pulses
Figure 10. Negative Slope Voltage Detector
Fast Charge Timer
A programmable backup charge timer is available for fast
charge termination. The timer is activated by the Time/Temp
Select comparator, and is programmed from the t1/T ref
High, t2/T sen , and t3/T ref Low inputs. If one or more of these
inputs is allowed to go above V CC ? 0.7 V or is left open, the
comparator output will switch high, indicating that the timer
feature is desired. The three inputs allow one of seven
possible fast charge time limits to be selected. The
programmable time limits, rounded to the nearest whole
minute, are shown in Table 1.
Over/Under Temperature Detection
A backup over/under temperature detector is available
and can be used in place of the timer for fast charge
termination. The timer is disabled by the Time/Temp Select
comparator when each of the three programming inputs are
held below V CC ? 0.7 V.
Temperature sensing is accomplished by placing a
negative temperature coefficient (NTC) thermistor in
thermal contact with the battery pack. The thermistor
connects to the t2/T sen input which has a 30 m A current
source pull?up for developing a temperature dependent
voltage. The temperature limits are set by a resistor that
connects from the t1/T ref High and the t3/T ref Low inputs to
ground. Since all three inputs contain matched 30 m A
current source pull?ups, the required programming resistor
values are identical to that of the thermistor at the desired
over and under trip temperature. The temperature window
detector is composed of two comparators with a common
input that connects to the t2/T sen input.
The lower comparator senses the presence of an under
temperature condition. When the lower temperature limit is
exceeded, the charger is switched to the trickle mode. The
comparator has 44 mV of hysteresis to prevent erratic
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MC33340P | 功能描述:电池管理 18V Max NiCD/NiMH RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
| MC33340PG | 功能描述:电池管理 18V Max NiCD/NiMH Fast Charge RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
| MC33340PG | 制造商:ON Semiconductor 功能描述:Battery Management IC |
| MC33341D | 功能描述:电池管理 2.3-15V Power Supply RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
| MC33341DG | 功能描述:电池管理 2.3-15V Power Supply Charger w/Regulation RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
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