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MC33342DR2G

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
MC33340, MC33342
http://onsemi.com
10
Figure 11. Timer Functional Block Diagram
Oscillator
760 kHz
÷2
3
÷2
6
÷2
3
÷2
1
÷2
5
÷2
8
÷2
2
÷2 ÷2 ÷2 ÷2
NormalTest
Switch 2
2
11
Switch 3A
2
5
95 kHz
SCK to
Voltage to
Frequency
Converter
Fast/Trickle Output
Time and Test Decoder
Each test mode bypass switch is shown
in the proper position for normal charger operation.
÷2
2
t1/T
ref
High
t3/T
ref
Low
t2/T
sen
Switch 3B
2
11
Switch 1
2
19
Q Q 22 ms Convert
11 ms Preset
Holdoff Time Signal
D
MC33340
MC33342
Figure 12. Line Isolated Linear Regulator Charger
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
sen
input 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 heat-
sinks for IC2 and are all manufactured by AAVID Engineering Inc.
V
CC
Undervoltage
Lockout
Over
Temp
Latch
Battery
Detect
Temp
Detect
Time/Temp
Select
V
sen
V
sen
Gate
Fast/
Trickle
Voltage to
Frequency
Converter
−DV Detect
Counter
Timer
Battery
Pack
Internal Bias
V
CC
V
CC
Gnd
Q
R
S
t1/T
ref
High
t2/T
sen
t3/T
ref
Low
7
6
5
8
4
3
2
1
High
Low
V
sen
Gate
F/T
Over
Under
t1
t2
t3
t/T
Ck F/V R
DC
Input
D1
Charge
Status
R2
R1
IC1 MC33340 or MC33342
2.0 V
1.0 V
R
NTC
10 k
R3
R4
SW2
SW1
SW3
2.9 V
30 mA
30 mA
30 mA
0.6 V
C2
0.1
D3
R5
1.0 k
1N4002
D2
C1
0.01
R7
2.4
R8
220
I
Adj
R6
1.8 k
AC
Line
Input
R2 + R1
ǒ
V
Batt
V
sen
–1
Ǔ
I
chg(fast)
+
V
ref
) (I
Adj
R8)
R7
I
chg(trickle)
+
V
in
–V
f(D3)
–V
Batt
R5
LM317
IC2
D4
MC33340, MC33342
http://onsemi.com
11
AAVID #
q
SA
°C/W
592502B03400 24.0
593002B03400 14.0
590302B03600 9.2
Figure 13. Printed Circuit Board and Component Layout
(Circuit of Figure 12)
MC33340
2.25″
1.70″
C2
(Top View) (Bottom View)
Battery
Negative
R
NTC
R
NTC
Battery
Positive
Input
Return
Input
Positive
R5
R6
R1
IC2
IC1
321
Charge Mode
R3
R2
R8
D2
R7
R4
D3
D4
Input
C1
R
NTC
Output
D1
Figure 14. Line Isolated Switch Mode Charger
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/Compensation pin, 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 in-
formation, refer to the UC3842 and UC3844 device family data sheets.
V
Battery
Current Sense
Comparator
Error
Amplifier
V
sen
Gate
Fast/
Trickle
Voltage
Feedback
Input
V
CC
Gnd 5
3
2
1
V
sen
Gate
F/T
2R
R2
R1
1.0 V
1.0 mA
UC3842 Series
Output/
Compensation
R
Primary Circuitry
Secondary Circuitry
Isolation Boundary
MC33340 or MC33342
Gnd 4
2
OC2
OC1
R3
MC33340, MC33342
http://onsemi.com
12
Figure 15. Switch Mode Fast Charger
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.
Q
S
R
V
sen
Gate
Fast/
Trickle
3
V
sen
Gate
F/T
MC33340/342
Gnd 4
2
AC
Line
Input
MC34166 or MC34167
OSC
PWM
Thermal
I
Limit
V
CC
4
2
1
Switch
Output
+
R4
R2
Voltage
Feedback
Input
Battery
Pack
EA
Ref
UVLO
Gnd 3 Compensation 5
C1 R3
R1
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

MC33342DR2G

Mfr. #:
Buy MC33342DR2G
Manufacturer:
ON Semiconductor
Description:
IC CTRLR BATTERY FAST CHRG 8SOIC
Lifecycle:
New from this manufacturer.
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