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MC33340DG Datasheet(PDF) 8 Page - ON Semiconductor

Part # MC33340DG
Description  Battery Fast Charge Controllers
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

MC33340DG Datasheet(HTML) 8 Page - ON Semiconductor

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MC33340, MC33342
http://onsemi.com
8
switching between the fast and trickle modes as the lower
temperature limit is crossed. The amount of temperature rise
to overcome the hysteresis is determined by the thermistor’s
rate of resistance change or sensitivity at the under
temperature trip point. The required resistance change is:
DR(T
Low ³
T
High
)
+
VH(T)
I
in
+ 44 mV
30
mA +
1.46 k
The resistance change approximates a thermal hysteresis
of 2
°C with a 10 kW thermistor operating at 0°C. The under
temperature fast charge inhibit feature can be disabled by
biasing the t3/Tref Low input to a voltage that is greater than
that present at t2/Tsen, and less than VCC − 0.7 V. Under
extremely cold conditions, it is possible that the thermistor
resistance can become too high, allowing the t2/Tsen input
to go above VCC − 0.7 V, and activate the timer. This
condition can be prevented by placing a resistor in parallel
with the thermistor. Note that the time/temperature
threshold of VCC − 0.7 V is a typical value at room
temperature. Refer to the Electrical Characteristics table
and to Figure 4 for additional information.
The upper comparator senses the presence of an over
temperature condition. When the upper temperature limit is
exceeded, the comparator output sets the Overtemperature
Latch and the charger is switched to trickle mode. Once the
latch is set, the charger cannot be returned to fast charge,
even after the temperature falls below the limit. This feature
prevents the battery pack from being continuously
temperature cycled and overcharged. The latch can be reset
by removing and reconnecting the battery pack or by cycling
the power supply voltage.
If the charger does not require either the time or
temperature backup features, they can both be easily
disabled. This is accomplished by biasing the t3/Tref Low
input to a voltage greater than t2/Tsen, and by grounding the
t1/Tref High input. Under these conditions, the Time/Temp
Select comparator output is low, indicating that the
temperature mode is selected, and that the t2/Tsen input is
biased within the limits of an artificial temperature window.
Charging of battery packs that are used in portable power
tool applications typically use temperature as the only
means for fast charge termination. The MC33340/342 can
be configured in this manner by constantly resetting the −
DV
detection logic. This is accomplished by biasing the Vsen
input to
≈1.5 V from a two resistor divider that is connected
between the positive battery pack terminal and ground. The
Vsen Gate output is also connected to the Vsen input. Now,
each time that the Sample Timer causes the Vsen output to go
low, the Vsen input will be pulled below the undervoltage
threshold of 1.0 V. This causes a reset of the −
DV logic every
1.38 seconds, thus disabling detection.
Operating Logic
The order of events in the charging process is controlled
by the logic circuitry. Each event is dependent upon the input
conditions and the chosen method of charge termination. A
table summary containing all of the possible operating
modes is shown in Table 2.
Table 1. FAST CHARGE BACKUP TERMINATION TIME/TEMPERATURE LIMIT
Backup
Termination
Mode
Programming Inputs
Time Limit
Fast Charge
(Minutes)
t3/Tref Low
(Pin 5)
t2/Tsen
(Pin 6)
t1/Tref High
(Pin 7)
Time
Open
Open
Open
283
Time
Open
Open
GND
247
Time
Open
GND
Open
212
Time
Open
GND
GND
177
Time
GND
Open
Open
141
Time
GND
Open
GND
106
Time
GND
GND
Open
71
Temperature
0 V to VCC − 0.7 V
0 V to VCC − 0.7 V
0 V to VCC − 0.7 V
Timer Disabled


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