MC33342 [ONSEMI]
BATTERY FAST CHARGE CONTROLLERS; 电池快速充电控制器
| 型号： | MC33342 |
| 厂家： | 
ONSEMI |
| 描述： | BATTERY FAST CHARGE CONTROLLERS |
| 文件： | 总12页 (文件大小：308K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Order this document by MC33340/D
The MC33340 and MC33342 are monolithic control IC’s that are
specifically designed as fast charge controllers for Nickel Cadmium (NiCd)
and Nickel Metal Hydride (NiMH) batteries. These devices feature negative
slope voltage detection as the primary means for fast charge termination.
Accurate detection is ensured by an output that momentarily interrupts the
charge current for precise voltage sampling. An additional secondary
backup termination method can be selected that consists of either a
programmable time or temperature limit. Protective features include battery
over and undervoltage detection, latched over temperature detection, and
power supply input undervoltage lockout with hysteresis. Fast charge holdoff
time is the only difference between the MC33340 and the MC33342. The
MC33340 has a typical holdoff time of 177 seconds and the MC33342 has a
typical holdoff time of 708 seconds.
BATTERY FAST CHARGE
CONTROLLERS
SEMICONDUCTOR
TECHNICAL DATA
• Negative Slope Voltage Detection with 4.0 mV Sensitivity
• Accurate Zero Current Battery Voltage Sensing
• High Noise Immunity with Synchronous VFC/Logic
• Programmable 1 to 4 Hour Fast Charge Time Limit
• Programmable Over/Under Temperature Detection
• Battery Over and Undervoltage Fast Charge Protection
• Power Supply Input Undervoltage Lockout with Hysteresis
• Operating Voltage Range of 3.0 V to 18 V
P SUFFIX
PLASTIC PACKAGE
CASE 626
8
1
D SUFFIX
PLASTIC PACKAGE
• 177 seconds Fast Change Hold–off Time (MC33340)
• 708 seconds Fast Change Hold–off Time (MC33342)
8
CASE 751
1
(SO–8)
Simplified Block Diagram
DC
Input
V
8
CC
PIN CONNECTIONS
Undervoltage
Lockout
Internal Bias
V
CC
Voltage to
Frequency
Converter
V
V
V
Input
1
2
3
4
8
7
6
5
CC
sen
sen
Over
Temp
Latch
1
t1/T High
ref
V
Gate Output
sen
Ck
High
F/V
R
Over
R
S
Battery
Pack
Fast/Trickle Output
Gnd
t2/T
sen
Q
Battery
Detect
Temp
Detect
t3/T Low
ref
Low
Under
t1
t1/T High
ref
(Top View)
7
–∆V Detect
Counter
Timer
V
Gate
t2/T
sen
sen
t2
6
V
sen
2
ORDERING INFORMATION
Operating
Gate
t3/T
Low
ref
t3
5
3
Temperature Range
Device
Package
Plastic DIP
Plastic DIP
SO–8
V
CC
Fast/
Trickle
F/T
t/T
Time/
Temp
Select
MC33340P
MC33342P
MC33340D
MC33342D
T
= –25° to +85°C
A
Gnd
4
SO–8
This device contains 2,512 active transistors.
Motorola, Inc. 1999
Rev 3
MC33340 MC33342
MAXIMUM RATINGS
Rating
Symbol
Value
Unit
Power Supply Voltage (Pin 8)
Input Voltage Range
V
CC
18
V
V
Time/Temperature Select (Pins 5, 6, 7)
Battery Sense, Note 1 (Pin 1)
V
–1.0 to V
+ 0.6 or –1.0 to 10
CC
IR(t/T)
CC
V
–1.0 to V
IR(sen)
V
sen
Gate Output (Pin 2)
Voltage
Current
V
I
20
50
V
mA
O(gate)
O(gate)
Fast/Trickle Output (Pin 3)
Voltage
Current
V
I
20
50
V
mA
O(F/T)
O(F/T)
Thermal Resistance, Junction–to–Air
P Suffix, DIP Plastic Package, Case 626
D Suffix, SO–8 Plastic Package, Case 751
Operating Junction Temperature
R
°C/W
θJA
100
178
T
+150
°C
°C
°C
J
Operating Ambient Temperature (Note 2)
Storage Temperature
T
–25 to +85
A
T
–55 to +150
stg
NOTE: ESD data available upon request.
ELECTRICAL CHARACTERISTICS (V
CC
= 6.0 V, for typical values T = 25°C, for min/max values T is the operating
A A
ambient temperature range that applies (Note 2), unless otherwise noted.)
Characteristic
Symbol
Min
Typ
Max
Unit
BATTERY SENSE INPUT (Pin 1)
Input Sensitivity for –∆V Detection
Overvoltage Threshold
–∆V
th
–
1.9
0.95
–
–4.0
2.0
1.0
10
–
2.1
1.05
–
mV
V
V
th(OV)
Undervoltage Threshold
V
mV
nA
MΩ
th(UV)
Input Bias Current
I
IB
Input Resistance
R
–
6.0
–
in
TIME/TEMPERATURE INPUTS (Pins 5, 6, 7)
Programing Inputs (V = 1.5 V)
in
Input Current
I
∆I
–24
–
–30
1.0
–36
2.0
µA
%
in
in
Input Current Matching
Input Offset Voltage, Over and Under Temperature Comparators
Under Temperature Comparator Hysteresis (Pin 5)
Temperature Select Threshold
V
–
–
–
5.0
44
–
–
–
mV
mV
V
IO
V
H(T)
V
V
–0.7
th(t/T)
CC
INTERNAL TIMING
Internal Clock Oscillator Frequency
f
–
760
–
kHz
OSC
V
Gate Output (Pin 2)
Gate Time
t
sen
gate
–
–
33
1.38
–
–
ms
s
Gate Repetition Rate
Fast Charge Holdoff from –∆V Detection
MC33340
MC33342
t
s
hold
–
–
177
708
–
–
V
GATE OUTPUT (Pin 2)
sen
Off–State Leakage Current (V = 20 V)
I
–
–
10
–
–
nA
V
O
off
Low State Saturation Voltage (I
= 10 mA)
V
1.2
sink
FAST/TRICKLE OUTPUT (Pin 3)
Off–State Leakage Current (V = 20 V)
OL
I
–
–
10
–
–
nA
V
O
off
Low State Saturation Voltage (I
= 10 mA)
V
1.0
sink
UNDERVOLTAGE LOCKOUT (Pin 8)
OL
Start–Up Threshold (V
Turn–Off Threshold (V
Increasing, T = 25°C)
V
–
3.0
3.1
–
V
V
CC
CC
A
th(on)
th(off)
Decreasing, T = 25°C)
V
2.75
2.85
A
TOTAL DEVICE (Pin 8)
Power Supply Current (Pins 5, 6, 7 Open)
I
mA
CC
Start–Up (V
= 2.9 V)
= 6.0 V)
–
–
0.65
0.61
2.0
2.0
CC
Operating (V
CC
NOTES: 1. Whichever voltage is lower.
2. Tested junction temperature range for the MC33340/342:
T
= –25°C
T
= +85°C
low
high
2
MOTOROLA ANALOG IC DEVICE DATA
MC33340 MC33342
Figure 1. Battery Sense Input Thresholds
versus Temperature
Figure 2. Oscillator Frequency
versus Temperature
2.10
2.00
1.90
16
V
= 6.0 V
CC
V
= 6.0 V
CC
8.0
0
1.02
1.00
0.98
–8.0
–16
–50
–25
0
25
50
75
C)
100
125
–50
–25
0
25
50
75
C)
100
125
T , AMBIENT TEMPERATURE (
°
T , AMBIENT TEMPERATURE (
°
A
A
Figure 3. Temperature Select Threshold Voltage
versus Temperature
Figure 4. Saturation Voltage versus Sink Current
V
Gate and Fast/Trickle Outputs
sen
0
3.2
V
= 6.0 V
= 25°C
V
= 6.0 V
CC
CC
V
CC
T
A
–0.2
Threshold voltage is measured with respect to V
.
2.4
1.6
CC
V
Gate
sen
Pin 2
–
0.4
–0.6
–0.8
–1.0
Time mode is selected if any of
the three inputs are above the
threshold.
Fast/Trickle
Pin 3
0.8
0
Temperature mode is selected
when all three inputs are below
the threshold.
–50
–25
0
25
50
75
C)
100
125
0
8.0
16
24
32
40
T , AMBIENT TEMPERATURE (
°
I
sink
, SINK SATURATION (mA)
A
Figure 5. Undervoltage Lockout Thresholds
versus Temperature
Figure 6. Supply Current
versus Supply Voltage
3.1
3.0
1.0
0.8
0.6
T
= 25°C
A
Startup Threshold
(V
Increasing)
CC
2.9
2.8
2.7
0.4
0.2
0
Minimum Operating Threshold
(V
Decreasing)
CC
–50
–25
0
25
50
75
C)
100
125
0
4.0
8.0
12
16
T , AMBIENT TEMPERATURE (
°
V
, SUPPLY VOLTAGE (V)
A
CC
3
MOTOROLA ANALOG IC DEVICE DATA
MC33340 MC33342
INTRODUCTION
Nickel Cadmium and Nickel Metal Hydride batteries
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 under temperature limits also for backup charge
termination.
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 7.
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 8 shows the typical charge
characteristics for NiCd and NiMh batteries.
The battery voltage is monitored by the V
input that
internally connects to a voltage to frequency converter and
sen
Figure 7. Typical Battery Charging Application
Regulator
DC
Input
MC33340 or MC33342
Undervoltage
V
8
CC
Reg Control
Lockout
Internal Bias
V
CC
2.9 V
R2
R1
Voltage to
Frequency
Converter
V
R
sen
1
T
NTC
Over
Temp
Latch
Charge
Status
Ck
High
F/V
R
Over
R
Q
Battery
Pack
S
2.0 V
1.0 V
Battery
Detect
Temp
Detect
Low
Under
t1
30
µA
µA
µA
t1/T High
ref
–
∆V Detect
Counter
Timer
7
SW1
SW3
R3
30
30
V
sen
t2/T
sen
t2
Gate
6
V
Gate
sen
SW2
2
t3/T Low
ref
t3
5
3
R4
Fast/
Trickle
t/T
V
F/T
CC
Time/
Temp
Select
0.7 V
Gnd
4
V
Batt
R2
R1
– 1
V
sen
4
MOTOROLA ANALOG IC DEVICE DATA
MC33340 MC33342
Figure 8. Typical Charge Characteristics for NiCd and NiMh Batteries
1.6
70
V
max
–∆V
dV
dt
1.5
60
T
max
1.4
1.3
1.2
1.1
1.0
50
40
30
20
10
Voltage
Temperature
Relative Pressure
40
0
80
120
160
CHARGE INPUT PERCENT OF CAPACITY
OPERATING DESCRIPTION
The MC33340/342 starts up in the fast charge mode when
low for a 33 ms period. This output is used to momentarily
interrupt the external charging power source so that a precise
power is applied to V . A change to the trickle mode can
CC
occur as a result of three possible conditions. The first is if the
voltage measurement can be taken. As the V Gate goes
sen
V
input voltage is above 2.0 V or below 1.0 V. Above 2.0 V
low, the internal Preset control line is driven high for 11 ms.
During this time, the battery voltage at the V input is
sen
indicates that the battery pack is open or disconnected, while
below 1.0 V indicates the possibility of a shorted or defective
cell. The second condition is when the MC33340/342 detects
a fully charged battery by measuring a negative slope in
battery voltage. The MC33340/342 recognize a negative
sen
allowed to stabilize and the previous F count is preloaded.
V
At the Preset high–to–low transition, the Convert line goes
high for 22 ms. This gates the F pulses into the ratchet
V
counter for a comparison to the preloaded count. Since the
Convert time is derived from the same clock that controls the
voltage slope after the preset holdoff time (t ) has elapsed
hold
during a fast charge cycle. This indicates that the battery
pack is fully charged. The third condition is either due to the
battery pack being out of a programmed temperature range,
or that the preset timer period has been exceeded.
VFC, the number of F pulses is independent of the clock
V
frequency. If the new sample has more counts than were
preloaded, it becomes the new peak count and the cycle is
repeated 1.38 seconds later. If the new sample has two fewer
counts, a less than peak voltage event has occurred, and a
register is initialized. If two successive less than peak voltage
events occur, the –∆V ‘AND’ gate output goes high and the
Fast/Trickle output is latched in a low state, signifying that the
battery pack has reached full charge status.
There are three conditions that will cause the controller to
return from trickle to fast charge mode. The first is if the V
sen
input voltage moved to within the 1.0 to 2.0 V range from
initially being either too high or too low. The second is if the
battery pack temperature moved to within the programmed
temperature range, but only from initially being too cold. Third
Negative slope voltage detection starts after 60 ms have
elapsed in the fast charge mode. This does not affect the
is by cycling V
off and then back on causing the internal
CC
logic to reset. A concise description of the major circuit blocks
is given below.
Fast/Trickle output until the holdoff time (t
) has elapsed
hold
during the fast charge mode. Two scenarios then exist.
Trickle mode holdoff is implemented to ignore any initial drop
in voltage that may occur when charging batteries that have
been stored for an extended time period. If the negative slope
voltage detector senses that initial drop during the holdoff
time, and the input voltage rises as the battery charges, the
Fast/Trickle output will remain open. However, if the negative
slope voltage detector senses a negative drop in voltage
during the holdoff time and the input voltage never rises
above that last detected level, the Fast/Trickle output will
latch into a low state. The negative slope voltage detector
has a maximum resolution of 2.0 V divided by 1023, or 1.955
mV per count with an uncertainty of ±1.0 count. This yields a
detection range of 1.955 mV to 5.865 mV. In order to obtain
maximum sensing accuracy, the R2/R1 voltage divider must
Negative Slope Voltage Detection
A representative block diagram of the negative slope
voltage detector is shown in Figure 9. It includes a
Synchronous Voltage to Frequency Converter, a Sample
Timer, and a Ratchet Counter. The V
pin is the input for the
sen
Voltage to Frequency Converter (VFC), and it connects to the
rechargeable battery pack terminals through a resistive
voltage divider. The input has an impedance of
approximately 6.0 MΩ and a maximum voltage range of
–1.0 V to V
+ 0.6 V or 0 V to 10 V, whichever is lower. The
CC
10 V upper limit is set by an internal zener clamp that
provides protection in the event of an electrostatic discharge.
The VFC is a charge–balanced synchronous type which
generates output pulses at a rate of F = V
(24 kHz).
V
sen
The Sample Timer circuit provides a 95 kHz system clock
signal (SCK) to the VFC. This signal synchronizes the F
be adjusted so that the V
input voltage is slightly less than
sen
2.0 V when the battery pack is fully charged. Voltage
variations due to temperature and cell manufacturing must
be considered.
V
output to the other Sample Timer outputs used within the
detector. At 1.38 second intervals the V Gate output goes
sen
5
MOTOROLA ANALOG IC DEVICE DATA
MC33340 MC33342
Figure 9. Negative Slope Voltage Detector
Battery Detect
Low High UVLO
F
= V (24 kHz)
sen
V
Synchronous
Voltage to
Frequency
Converter
F/T
V
sen
Input
Ck
Rachet
Counter
–∆V
Logic
Over Under Charge
Temperature Timer
Trickle Mode
Holdoff
V
Gate
sen
SCK
95 kHz
Sample
Timer
V
Gate
sen
1.38 s
Preset
11 ms
Convert
22 ms
Rachet Counter Convert
0 to 1023 F Pulses
V
6
MOTOROLA ANALOG IC DEVICE DATA
MC33340 MC33342
Fast Charge Timer
A programmable backup charge timer is available for fast
charge termination. The timer is activated by the Time/Temp
that present at t2/T , and less than V – 0.7 V. Under
sen CC
extremely cold conditions, it is possible that the thermistor
resistance can become too high, allowing the t2/T input to
sen
– 0.7 V, and activate the timer. This condition
can be prevented by placing a resistor in parallel with the
go above V
Select comparator, and is programmed from the t1/T High,
CC
ref
t2/T , and t3/T Low inputs. If one or more of these inputs
sen
ref
thermistor. Note that the time/temperature threshold of V
is allowed to go above V
– 0.7 V or is left open, the
CC
CC
– 0.7 V is a typical value at room temperature. Refer to the
Electrical Characteristics table and to Figure 3 for additional
information.
comparator output will switch high, indicating that the timer
feature is desired. The three inputs allow one of seven
possible fast charge time limits to be selected. The
programmable time limits, rounded to the nearest whole
minute, are shown in Figure 10.
The upper comparator senses the presence of an over
temperature condition. When the upper temperature limit is
exceeded, the comparator output sets the Over Temperature
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.
Over/Under Temperature Detection
A backup over/under temperature detector is available
and can be used in place of the timer for fast charge
termination. The timer is disabled by the Time/Temp Select
comparator when each of the three programming inputs are
held below V
– 0.7 V.
CC
Temperature sensing is accomplished by placing a
negative temperature coefficient (NTC) thermistor in thermal
contact with the battery pack. The thermistor connects to the
If the charger does not require either the time or
temperature backup features, they can both be easily
t2/T
input which has a 30 µA current source pull–up for
sen
disabled. This is accomplished by biasing the t3/T
Low
ref
developing a temperature dependent voltage. The
temperature limits are set by a resistor that connects from the
input to a voltage greater than t2/T , and by grounding the
sen
t1/T
ref
High input. Under these conditions, the Time/Temp
t1/T High and the t3/T Low inputs to ground. Since all
ref ref
Select comparator output is low, indicating that the
temperature mode is selected, and that the t2/T input is
three inputs contain matched 30 µA current source pull–ups,
the required programming resistor values are identical to that
of the thermistor at the desired over and under trip
temperature. The temperature window detector is composed
of two comparators with a common input that connects to the
sen
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 –∆V
t2/T
input.
sen
The lower comparator senses the presence of an under
temperature condition. When the lower temperature limit is
exceeded, the charger is switched to the trickle mode. The
comparator has 44 mV of hysteresis to prevent erratic
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:
detection logic. This is accomplished by biasing the V
input
sen
to
≈1.5 V from a two resistor divider that is connected between
the positive battery pack terminal and ground. The V Gate
sen
input. Now, each time
output is also connected to the V
that the Sample Timer causes the V
sen
output to go low, the
input will be pulled below the undervoltage threshold of
sen
V
sen
1.0 V. This causes a reset of the –∆V logic every 1.38
seconds, thus disabling detection.
V
H(T)
44 mV
30
R(T
T
)
1.46 k
Operating Logic
Low
High
I
A
in
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 Figure 11.
The resistance change approximates a thermal hysteresis
of 2°C with a 10 kΩ thermistor operating at 0°C. The under
temperature fast charge inhibit feature can be disabled by
biasing the t3/T Low input to a voltage that is greater than
ref
Figure 10. Fast Charge Backup Termination Time/Temperature Limit
Programming Inputs
Backup
Termination
Mode
Time Limit
Fast Charge
(Minutes)
t3/T Low
ref
t2/T
sen
t1/T High
ref
(Pin 5)
Open
Open
Open
Open
Gnd
(Pin 6)
Open
Open
Gnd
(Pin 7)
Open
Gnd
Time
Time
283
247
Time
Open
Gnd
212
Time
Gnd
177
Time
Open
Open
Gnd
Open
Gnd
141
106
Time
Gnd
Time
Gnd
Open
71
Temperature
0 V to V
– 0.7 V 0 V to V
– 0.7 V 0 V to V – 0.7 V
CC
Timer Disabled
CC
CC
7
MOTOROLA ANALOG IC DEVICE DATA
MC33340 MC33342
Figure 11. Controller Operating Mode Table
Controller Operation
Input Condition
V
Input Voltage:
>1.0 V and <2.0 V
sen
The divided down battery pack voltage is within the fast charge voltage range. The charger switches from
trickle to fast charge mode as V enters this voltage range, and a reset pulse is then applied to the
sen
timer and the over temperature latch.
>1.0 V and <2.0 V with
two consecutive –∆V
The battery pack has reached full charge and the charger switches from fast to a latched trickle mode.
A reset pulse must be applied for the charger to switch back to the fast mode. The reset pulse occurs
events detected after 160 s
when entering the 1.0 V to 2.0 V window for V
or when V
rises above 3.0 V.
sen
CC
<1.0 V or >2.0 V
The divided down battery pack voltage is outside of the fast charge voltage range. The charger switches
from fast to trickle mode.
Timer Backup:
Within time limit
The timer has not exceeded the programmed limit. The charger will be in fast charge mode if V
sen
CC
and
V
are within their respective operating limits.
Beyond time limit
The timer has exceeded the programmed limit. The charger switches from fast to a latched trickle mode.
Temperature Backup:
Within limits
The battery pack temperature is within the programmed limits. The charger will be in fast charge mode if
V
sen
and V
are within their respective operating limits.
CC
Below lower limit
Above upper limit
The battery pack temperature is below the programmed lower limit. The charger will stay in trickle mode
until the lower temperature limit is exceeded. When exceeded, the charger will switch from trickle to fast
charge mode.
The battery pack temperature has exceeded the programmed upper limit. The charger switches from fast
to a latched trickle mode. A reset signal must be applied and then released for the charger to switch back
to the fast charge mode. The reset pulse occurs when entering the 1.0 V to 2.0 V window for V
or
sen
when V
rises above 3.0 V.
CC
Power Supply Voltage:
V
CC
>3.0 V and <18 V
This is the nominal power supply operating voltage range. The charger will be in fast charge mode if
, and temperature backup or timer backup are within their respective operating limits.
V
sen
V
CC
>0.6 V and <2.8 V
The undervoltage lockout comparator will be activated and the charger will be in trickle mode. A reset
signal is applied to the timer and over temperature latch.
Testing
Under normal operating conditions, it would take 283
minutes to verify the operation of the 34 stage ripple counter
used in the timer. In order to significantly reduce the test time,
three digital switches were added to the circuitry and are
used to bypass selected divider stages. Entering each of the
test modes without requiring additional package pins or
affecting normal device operation proved to be challenging.
Refer to the timer functional block diagram in Figure 12.
Switch 1 bypasses 19 divider stages to provide a 524,288
times speedup of the clock. This switch is enabled when the
the relatively short variable time delay would be transparent
to the user.
Switch 2 bypasses 11 divider stages to provide a 2048
times speedup of the clock. This switch is necessary for
testing the 19 stages that were bypassed when switch 1 was
enabled. Switch 2 is enabled when the V
input falls below
sen
High input is biased at –100 mV.
1.0 V and the t1/T
ref
Verification of the 19 stages is accomplished by measuring a
nominal propagation delay of 338.8 ms from when the V
sen
input falls below 1.0 V, to when the F/T output changes from
a high–to–low state.
V
input falls below 1.0 V. Verification of the programmed
sen
fast charge time limit is accomplished by measuring the
propagation delay from when the V input falls below 1.0 V,
Switch 3 is a dual switch consisting of sections “A” and “B”.
Section “A” bypasses 5 divider stages to provide a 32 times
sen
to when the F/T output changes from a high–to–low state.
The 71, 106, 141, 177, 212, 247 and 283 will now correspond
to 8.1, 12.1, 16.2, 20.2, 24.3, 28.3 and 32.3 ms delays. It is
possible to enter this test mode during operation if the
equivalent battery pack voltage was to fall below 1.0 V. This
will not present a problem since the device would normally
switch from fast to trickle mode under these conditions, and
speedup of the V
gate signal that is used in sampling the
sen
battery voltage. This speedup allows faster test verification of
two successive –∆V events. Section “B” bypasses 11 divider
stages to provide a 2048 speedup of the trickle mode holdoff
timer. Switches 3A and 3B are both activated when the t1/T
High input is biased at –100 mV with respect to Pin 4.
ref
8
MOTOROLA ANALOG IC DEVICE DATA
MC33340 MC33342
Figure 12. Timer Functional Block Diagram
11 ms Preset
22 ms Convert
Q
D
Q
Switch 2
Switch 3A
Normal
Test
11
2
5
2
Oscillator
760 kHz
3
6
2
3
1
5
8
2
÷2
÷2
÷2
÷2
÷2
÷2
÷2
÷2
÷2
÷2
÷2
÷2
Switch 3B
11
2
95 kHz
SCK to
Voltage to
Frequency
Converter
Switch 1
19
2
MC33340
MC33342
Holdoff Time Signal
t1/T High
ref
t2/T
Time and Test Decoder
Fast/Trickle Output
sen
t3/T Low
ref
Each test mode bypass switch is shown
in the proper position for normal charger operation.
Figure 13. Line Isolated Linear Regulator Charger
C2
0.1
R5
1.0 k
IC1 MC33340 or MC33342
V
8
CC
D3
Undervoltage
Lockout
Internal Bias
AC
Line
Input
V
1N4002
D2
CC
2.9 V
R2
R1
R
NTC
10 k
Voltage to
Frequency
Converter
V
sen
1
LM317
IC2
Over
Temp
Latch
C1
0.01
R7
2.4
Ck
High
F/V
R
R
S
Battery
Pack
DC
Input
I
Over
Q
Adj
2.0 V
1.0 V
Battery
Detect
Temp
Detect
R8
220
Low
Under
30
µA
µA
µA
t1/T High
ref
R6
1.8 k
t1
D4
7
–
∆
V Detect
Counter
Timer
SW1
R3
D1
Charge
Status
30
30
V
Gate
t2/T
sen
sen
t2
6
V
Gate
sen
SW2
2
t3/T Low
ref
t3
V
Batt
3
5
R2
I
R1
– 1
SW3
R4
V
sen
Fast/
V
t/T
CC
F/T
V
(I R8) Trickle
ref
Adj
Time/Temp
Select
chg(fast)
0.6 V
R7
V
– V
– V
Batt
in
f(D3)
R5
Gnd
4
I
chg(trickle)
This application combines the MC33340/342 with an adjustable three terminal regulator to form an isolated secondary side battery charger. Regulator IC2 operates
as a constant current source with R7 setting the fast charge level. The trickle charge level is set by R5. The R2/R1 divider should be adjusted so that the V input
sen
is less than 2.0 V when the batteries are fully charged. The printed circuit board shown below will accept the several TO–220 style heatsinks for IC2 and are all
manufactured by AAVID Engineering Inc.
9
MOTOROLA ANALOG IC DEVICE DATA
MC33340 MC33342
AAVID #
θ
°C/W
SA
592502B03400
593002B03400
590302B03600
24.0
14.0
9.2
Figure 14. Printed Circuit Board and Component Layout
(Circuit of Figure 13)
2.25″
Input
Return
Charge Mode
Battery
MC33340
Negative
Input
R
NTC
Input
Positive
3
2
1
R
NTC
NTC
R4
C1
D1
R
R3
Battery
Positive
IC1
Output
D2
1.70″
C2
R7
R2
R8
D3
IC2
(Top View)
(Bottom View)
Figure 15. Line Isolated Switch Mode Charger
UC3842 Series
V
CC
Voltage
Feedback
Input
1.0 mA
2R
R2
2
R
1.0 V
Error
Amplifier
R1
Current Sense
Comparator
1
Output/
Compensation
Gnd
5
Primary Circuitry
Isolation Boundary
Secondary Circuitry
V
Battery
OC2
MC33340 or MC33342
V
Gate
sen
V
sen
2
Gate
R3
OC1
3
Fast/
Trickle
F/T
Gnd
4
The MC33340/342 can be combined with any of the devices in the UC3842 family of current mode controllers to form a switch mode battery charger. In this example,
optocouplers OC1 and OC2 are used to provide isolated control signals to the UC3842. During battery voltage sensing, OC2 momentarily grounds the
Output/Compensationpin, effectively turning off the charger. When fast charge termination is reached, OC1 turns on, and grounds the lower side of R3. This reduces
the peak switch current threshold of the Current Sense Comparator to a programmed trickle current level. For additional converter design information, refer to the
UC3842 and UC3844 device family data sheets.
10
MOTOROLA ANALOG IC DEVICE DATA
MC33340 MC33342
Figure 16. Switch Mode Fast Charger
MC34166 or MC34167
AC
Line
Input
V
4
CC
I
Limit
+
Osc
S
R
R4
Switch
Output
Q
2
PWM
UVLO
Thermal
R2
Ref
EA
Voltage
Feedback
Input
Battery
Pack
1
Gnd
3
Compensation
5
C1
R3
R1
MC33340/342
V
Gate
sen
V
Gate
sen
2
3
Fast/
Trickle
F/T
Gnd
4
The MC33340/342 can be used to control the MC34166 or MC34167 power switching regulators to produce an economical and efficient fast charger. These devices
are capable of operating continuously in current limit with an input voltage range of 7.5 to 40 V. The typical charging current for the MC34166 and MC34167 is 4.3
A and 6.5 A respectively. Resistors R2 and R1 are used to set the battery pack fast charge float voltage. If precise float voltage control is not required, components
R1, R2, R3 and C1 can be deleted, and Pin 1 must be grounded. The trickle current level is set by resistor R4. It is recommended that a redundant charge termination
method be employed for end user protection. This is especially true for fast charger systems. For additional converter design information, refer to the MC34166 and
MC34167 data sheets.
11
MOTOROLA ANALOG IC DEVICE DATA
MC33340 MC33342
OUTLINE DIMENSIONS
P SUFFIX
PLASTIC PACKAGE
CASE 626–05
ISSUE K
8
5
NOTES:
1. DIMENSION L TO CENTER OF LEAD WHEN
–B–
FORMED PARALLEL.
2. PACKAGE CONTOUR OPTIONAL (ROUND OR
SQUARE CORNERS).
1
4
3. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
F
MILLIMETERS
INCHES
–A–
DIM
A
B
C
D
F
G
H
J
K
L
M
N
MIN
9.40
6.10
3.94
0.38
1.02
MAX
10.16
6.60
4.45
0.51
1.78
MIN
MAX
0.400
0.260
0.175
0.020
0.070
NOTE 2
0.370
0.240
0.155
0.015
0.040
L
C
2.54 BSC
0.100 BSC
0.76
0.20
2.92
7.62 BSC
–––
1.27
0.30
3.43
0.030
0.008
0.115
0.300 BSC
–––
0.050
0.012
0.135
J
–T–
SEATING
PLANE
N
10
1.01
10
0.040
M
D
K
0.76
0.030
G
H
M
M
M
0.13 (0.005)
T
A
B
D SUFFIX
PLASTIC PACKAGE
CASE 751–05
(SO–8)
NOTES:
ISSUE R
D
A
1. DIMENSIONING AND TOLERANCING PER ASME
Y14.5M, 1994.
2. DIMENSIONS ARE IN MILLIMETERS.
3. DIMENSION D AND E DO NOT INCLUDE MOLD
PROTRUSION.
4. MAXIMUM MOLD PROTRUSION 0.15 PER SIDE.
5. DIMENSION B DOES NOT INCLUDE MOLD
PROTRUSION. ALLOWABLE DAMBAR
PROTRUSION SHALL BE 0.127 TOTAL IN EXCESS
OF THE B DIMENSION AT MAXIMUM MATERIAL
CONDITION.
8
1
5
4
C
M
M
0.25
B
H
E
MILLIMETERS
B
e
DIM
A
A1
B
C
D
MIN
1.35
0.10
0.35
0.18
4.80
3.80
MAX
1.75
0.25
0.49
0.25
5.00
4.00
h X 45
A
C
SEATING
PLANE
E
e
H
h
L
1.27 BSC
0.10
5.80
0.25
0.40
0
6.20
0.50
1.25
7
A1
B
L
M
S
S
0.25
C
B
A
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the suitability of its products for any particular purpose, nor does Motorola assume any liability arising out of the application or use of any product or circuit, and
specificallydisclaims any and all liability, including without limitation consequential or incidental damages. “Typical” parameters which may be provided in Motorola
datasheetsand/orspecificationscananddovaryindifferentapplicationsandactualperformancemayvaryovertime. Alloperatingparameters,including“Typicals”
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MC33340/D
◊
相关型号：
MC33345DWR2
IC 4-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO20, PLASTIC, SO-20, Power Management Circuit
ONSEMI
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