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MC33340DR2G Datasheet(PDF) 5 Page - ON Semiconductor

tên linh kiện MC33340DR2G
Nội dung chi tiết  Battery Fast Charge Controllers
tải về  16 Pages
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nhà sản xuất  ONSEMI [ON Semiconductor]
Trang chủ  http://www.onsemi.com
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MC33340, MC33342
http://onsemi.com
5
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 Vsen input that
internally connects to a voltage to frequency converter and
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.
Figure 8. Typical Battery Charging Application
VCC
Undervoltage
Lockout
Over
Temp
Latch
Battery
Detect
Temp
Detect
Time/
Temp
Select
Vsen
Vsen
Gate
Fast/
Trickle
Voltage to
Frequency
Converter
DV Detect
Counter
Timer
Battery
Pack
Internal Bias
VCC
VCC
Gnd
Q
R
S
t1/Tref High
t2/Tsen
t3/Tref Low
7
6
5
8
4
3
2
1
High
Low
Vsen
Gate
F/T
Over
Under
t1
t2
t3
t/T
Ck
F/V
R
Regulator
Reg Control
DC
Input
Charge
Status
R2
R1
MC33340 or MC33342
2.0 V
1.0 V
RNTC
R3
R4
SW2
SW1
SW3
2.9 V
30
mA
30
mA
30
mA
0.7 V
R2
+ R1
VBatt
Vsen
– 1
T



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