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参数资料
| 型号： | MC33342PG |
| 厂商： | ON Semiconductor |
| 文件页数： | 5/16页 |
| 文件大小： | 0K |
| 描述： | IC CTRLR BATTERY FAST CHRG 8DIP |
| 产品变化通告： | Product Obsolescence 14/Apr/2010 |
| 标准包装： | 50 |
| 功能： | 充电管理 |
| 电池化学： | 镍镉（NiCd）、镍金属氢化物（NiMH） |
| 电源电压： | 3.25 V ~ 18 V |
| 工作温度： | -25°C ~ 85°C |
| 安装类型： | 通孔 |
| 封装/外壳： | 8-DIP（0.300"，7.62mm） |
| 供应商设备封装： | 8-PDIP |
| 包装： | 管件 |
| 其它名称： | MC33342PGOS |
MC33340, MC33342
INTRODUCTION
Nickel Cadmium and Nickel Metal Hydride batteries
require precise charge termination control to maximize cell
capacity and operating time while preventing overcharging.
Overcharging can result in a reduction of battery life as well
as physical harm to the end user. Since most portable
applications require the batteries to be charged rapidly, a
primary and usually a secondary or redundant charge sensing
technique is employed into the charging system. It is also
desirable to disable rapid charging if the battery voltage or
temperature is either too high or too low. In order to address
these issues, an economical and flexible fast charge controller
was developed.
The MC33340/342 contains many of the building blocks
and protection features that are employed in modern high
performance battery charger controllers that are specifically
designed for Nickel Cadmium and Nickel Metal Hydride
batteries. The device is designed to interface with either
primary or secondary side regulators for easy implementation
of a complete charging system. A representative block diagram
in a typical charging application is shown in Figure 8.
The battery voltage is monitored by the V sen input that
internally connects to a voltage to frequency converter and
Regulator
DC
counter for detection of a negative slope in battery voltage. A
timer with three programming inputs is available to provide
backup charge termination. Alternatively, these inputs can be
used to monitor the battery pack temperature and to set the
over and undertemperature limits also for backup charge
termination.
Two active low open collector outputs are provided to
interface this controller with the external charging circuit.
The first output furnishes a gating pulse that momentarily
interrupts the charge current. This allows an accurate method
of sampling the battery voltage by eliminating voltage drops
that are associated with high charge currents and wiring
resistances. Also, any noise voltages generated by the
charging circuitry are eliminated. The second output is
designed to switch the charging source between fast and
trickle modes based upon the results of voltage, time, or
temperature. These outputs normally connect directly to a
linear or switching regulator control circuit in non?isolated
primary or secondary side applications. Both outputs can be
used to drive optoisolators in primary side applications that
require galvanic isolation. Figure 9 shows the typical charge
characteristics for NiCd and NiMh batteries.
Input
Reg Control
MC33340 or MC33342
Undervoltage
V CC 8
Internal Bias
Lockout
V CC
R2
R1
V sen
1
Voltage to
Frequency
Converter
Over
Temp
2.9 V
T
R NTC
? D V Detect
Charge
Status
V sen
Gate
2
2.0 V
1.0 V
Battery
Detect
Ck F/V R
Low Under
V sen
Gate
Counter
Timer
High Over
t1
t2
t3
Q
R
S
Latch
Temp
Detect
30 m A
30 m A
30 m A
Battery
Pack
t1/T ref High
7
SW1
t2/T sen
6
t3/T ref Low
SW2
R3
3
5
SW3
R4
Fast/
Trickle
F/T
t/T
Time/
V CC
Temp
Select
0.7 V
R2 + R1
VBatt
Vsen
– 1
Gnd
4
Figure 8. Typical Battery Charging Application
http://onsemi.com
5
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