- 您现在的位置：买卖IC网 > PDF目录80086 > LM3420A-8.4MWA (NATIONAL SEMICONDUCTOR CORP) 1-CHANNEL POWER SUPPLY SUPPORT CKT, UUC PDF资料下载
参数资料
| 型号： | LM3420A-8.4MWA |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, UUC |
| 封装： | WAFER |
| 文件页数： | 8/21页 |
| 文件大小： | 468K |
| 代理商： | LM3420A-8.4MWA |
Application Circuits (Continued)
A rapid charge Lithium-Ion battery charging circuit is shown
in
Figure 10. This configuration uses a switching regulator to
deliver the charging current in a series of constant current
pulses.
At
the
beginning
of
the
charge
cycle
(constant-current mode), this circuit performs identically to
the previous LM2575 charger by charging the battery at a
constant current of 1A. As the battery voltage reaches 8.4V,
this charger changes from a constant continuous current of
1A to a 5 second pulsed 1A. This allows the total battery
charge time to be reduced considerably. This is different
from the other charging circuits that switch from a constant
current charge to a constant voltage charge once the battery
voltage reaches 8.4V. After charging the battery with 1A for 5
seconds, the charge stops, and the battery voltage begins to
drop. When it drops below 8.4V, the LM555 timer again
starts the timing cycle and charges the battery with 1A for an-
other 5 seconds. This cycling continues with a constant 5
second charge time, and a variable off time. In this manner,
the battery will be charged with 1A for 5 seconds, followed by
an off period (determined by the battery’s state of charge),
setting up a periodic 1A charge current. The off time is deter-
mined by how long it takes the battery voltage to decrease
back down to 8.4V. When the battery first reaches 8.4V, the
off time will be very short (1 ms or less), but when the battery
approaches full charge, the off time will begin increasing to
tens of seconds, then minutes, and eventually hours.
The constant-current loop for this charger and the method
used for programming the 1A constant current is identical to
the previous LM2575-ADJ. charger. In this circuit, a second
LM3420-8.4 has its V
REG
increased by approximately
400 mV (via R2), and is used to limit the output voltage of the
charger to 8.8V in the event of a bad battery connection, or
the battery is removed or possibly damaged.
The LM555 timer is connected as a one-shot, and is used to
provide the 5 second charging pulses. As long as the battery
voltage is less than the 8.4V, the output of IC3 will be held
low, and the LM555 one-shot will never fire (the output of the
LM555 will be held high) and the one-shot will have no effect
on the charger. Once the battery voltage exceeds the 8.4V
regulation voltage of IC3, the trigger pin of the LM555 is
pulled high, enabling the one shot to begin timing. The
charge current will now be pulsed into the battery at a 5 sec-
ond rate, with the off time determined by the battery’s state
of charge. The LM555 output will go high for 5 seconds (pull-
ing down the collector of Q1) which allows the 1A
constant-current loop to control the circuit.
Figure 11 shows a low dropout constant voltage charger us-
ing a MOSFET as the pass element, but this circuit does not
include current limiting. This circuit uses Q3 and a Schottky
diode to isolate the battery from the charging circuitry when
the input voltage is removed, to prevent the battery from dis-
charging. Q2 should be a high current (0.2
) FET, while Q3
can be a low current (2
) device.
Note: Although the application circuits shown here have
been built and tested, they should be thoroughly evalu-
ated with the same type of battery the charger will even-
tually be used with.
Different battery manufacturers may use a slightly dif-
ferent battery chemistry which may require different
charging characteristics. Always consult the battery
manufacturer for information on charging specifications
and battery details, and always observe the manufactur-
ers precautions when using their batteries. Avoid over-
charging or shorting Lithium-Ion batteries.
DS012359-16
FIGURE 11. MOSFET Low Dropout Charger
LM3420-4.2/LM3420-8.2/LM3420-8.4/LM3420-12.6/LM3420-16.8
www.national.com
16
相关PDF资料 |
PDF描述 |
|---|---|
| LM2641-ADJMWC | DUAL SWITCHING CONTROLLER, 345 kHz SWITCHING FREQ-MAX, UUC |
| LSN-5/10-D12BH-C | 1-OUTPUT 50 W DC-DC REG PWR SUPPLY MODULE |
| LM3722EM5-3.08/NOPB | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO5 |
| LM2576S-12TRT | 7.5 A SWITCHING REGULATOR, 62 kHz SWITCHING FREQ-MAX, PSSO5 |
| LSP3127S50E | SWITCHING REGULATOR, PDSO8 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LM3420AL-4.2 DIE | 制造商:Texas Instruments 功能描述: |
| LM3420AL-8.2 WAF | 制造商:Texas Instruments 功能描述: |
| LM3420AM5-12.6 | 功能描述:IC CTRLR LIION BAT CHRG SOT23-5 RoHS:否 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 标准包装:1 系列:- 功能:充电管理 电池化学:锂离子（Li-Ion）、锂聚合物（Li-Pol） 电源电压:3.75 V ~ 6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SC-74A，SOT-753 供应商设备封装:SOT-23-5 包装:剪切带 (CT) 产品目录页面:669 (CN2011-ZH PDF) 其它名称:MCP73831T-2ACI/OTCT |
| LM3420AM5-12.6/NOPB | 制造商:Texas Instruments 功能描述:Battery Charger Li-Ion 15mA 12.6V 5-Pin SOT-23 T/R |
| LM3420AM5-16.8 | 制造商:NSC 制造商全称:National Semiconductor 功能描述:Lithium-Ion Battery Charge Controller |
发布紧急采购，3分钟左右您将得到回复。