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MC33340, MC33342
AAVID #
592502B03400
593002B03400
590302B03600
q SA ° C/W
24.0
14.0
9.2
2.25 ″
Input
Return
Input
Positive
Input
D1
R4
C1
Charge Mode
3 2 1
R3
R NTC
Battery
Negative
R NTC
R NTC
MC33340
IC1
C2
Output
D2
Battery
Positive
1.70 ″
R2
D3
R8
IC2
R7
(Top View)
Figure 13. Printed Circuit Board and Component Layout
(Circuit of Figure 12)
UC3842 Series
(Bottom View)
V CC
R2
Voltage
Feedback
Input
1.0 mA
2R
R1
2
1
Error
Amplifier
R
1.0 V
Current Sense
Output/
Comparator
Compensation
Primary Circuitry
Gnd
Isolation Boundary
5
OC2
V Battery
V sen
Gate
Secondary Circuitry
MC33340 or MC33342
R3
OC1
2
3
Fast/
Trickle
V sen
Gate
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/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.
Figure 14. Line Isolated Switch Mode Charger
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