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參數(shù)資料
| 型號： | LM3647 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | Universal Battery Charger for Li-Ion, Ni-MH and Ni-Cd Batteries |
| 中文描述： | 通用電池充電器鋰離子電池，鎳氫，鎳鎘電池 |
| 文件頁數(shù)： | 8/17頁 |
| 文件大?。?/td> | 272K |
| 代理商： | LM3647 |
8
www.national.com
nection between RESET and SYSOK is optional but highly
recommended for safe operation of the LM3647.
4.3.5 Dimensioning the RCIN circuitry
The RC-circuitry is designed to time the charger so it charges
and regulates at the correct frequency. The values of the R
and C are important, because a change in the RC-value
gives a higher or lower operating frequency which affects
charge quality. The capacitance should be a ceramic type
and preferably an NP0 type, which gives the least frequency
deviation with temperature change.
4.3.6 Dimensioning the DISCHARGE circuitry
The discharge-circuitry controls the discharge rate during the
discharge phase (if used). The discharge output turns on the
transistor Q2, and a current flows from the battery through
the discharge resistor R8. The current through R8 depends
on battery voltage and the value of R8. This value depends
on the maximum discharge rate for the battery-pack. The ap-
proximate value can be calculated using the formula below:
The resistor R7 keeps the transistor Q2 off until the LM3647
has been powered up and is in control of the circuitry.
4.3.7 BUZZER output circuitry
The buzzer-circuitry turns the transistor Q3 on when the
buzzer should sound. If the current consumption for the buzz-
er is lower than 0.3mA then the buzzer may be directly con-
nected to the BUZZER-pin. Please note that the BUZZER-
pin does not generate a PWM-signal, such buzzers must
have their own drive-circuitry. If an electromagnetic buzzer is
used, then the transistor may need a reverse-biased diode to
protect it from harmful voltage spikes.
4.3.8 PWM filter circuitry
The PWM-pin can either output a fast PWM-signal, or a slow
on/off output (for controlling external constant current source,
Ni-Cd/Ni-MH mode only).
Fast PWM-mode:
The RC-network R6, C9 and R5, C1||C2 lowpass-filters the
PWM-signal from the LM3647 to a DC-level that is fed into
the operational amplifier. The resistor R22 is required to pre-
vent DC-output before the LM3647 has control of the RC-net-
works.
R
8
MaximumDisch
eRate
arg
MaximumBatteryVoltage
≈
Q3
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM3647IM | 功能描述:IC BATT CHARGER UNIVERSAL 20SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 標準包裝:1 系列:- 功能:充電管理 電池化學(xué):鋰離子（Li-Ion）、鋰聚合物（Li-Pol） 電源電壓:3.75 V ~ 6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SC-74A，SOT-753 供應(yīng)商設(shè)備封裝:SOT-23-5 包裝:剪切帶 (CT) 產(chǎn)品目錄頁面:669 (CN2011-ZH PDF) 其它名稱:MCP73831T-2ACI/OTCT |
| LM3647IM | 制造商:Texas Instruments 功能描述:IC UNIV BATT CHARGER 3647 SOIC20 |
| LM3647M | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Battery Management |
| LM3648EVM | 功能描述:LM3648 1, Non-Isolated Output LED Driver Evaluation Board 制造商:texas instruments 系列:- 零件狀態(tài):有效 電流 - 輸出/通道:1.5A 輸出和類型:1，非隔離 電壓 - 輸出:- 特性:I2C 電壓 - 輸入:2.5 V ~ 5.5 V 所含物品:板 使用的 IC/零件:LM3648 標準包裝:1 |
| LM3648TTYFFR | 功能描述:LED 驅(qū)動器 IC 1 輸出 DC DC 穩(wěn)壓器 升壓（升壓） 調(diào)光 1.5A（閃存） 12-DSBGA 制造商:texas instruments 系列:- 包裝:剪切帶（CT） 零件狀態(tài):在售 類型:DC DC 穩(wěn)壓器 拓撲:升壓（升壓） 內(nèi)部開關(guān):是 輸出數(shù):1 電壓 - 供電（最低）:2.5V 電壓 -?供電（最高）:5.5V 電壓 - 輸出:- 電流 - 輸出/通道:1.5A（閃存） 頻率:4MHz 調(diào)光:- 應(yīng)用:照相機閃光燈 工作溫度:-40°C ~ 85°C（TA） 安裝類型:表面貼裝 封裝/外殼:12-UFBGA，DSBGA 供應(yīng)商器件封裝:12-DSBGA 標準包裝:1 |
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