MC33342 ON Semiconductor, MC33342 Datasheet - Page 11

• Manufacturer Part Number: MC33342
• Description: (MC33340 / MC33342) Battery Fast Charge Controllers
• Manufacturer: ON Semiconductor

Input
Return
Input
Positive
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.
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Input
D1
IC2
D3
R3
(Top View)
R4
C1
Figure 13. Printed Circuit Board and Component Layout
R2
R1
Charge Mode
IC1
OC2
OC1
V
R3
CC
3 2 1
R2
R8
Figure 14. Line Isolated Switch Mode Charger
C2
Compensation
R7
Feedback
R
Voltage
Output
Output/
NTC
D2
Input
V
592502B03400
593002B03400
590302B03600
Battery
MC33340, MC33342
2
1
Primary Circuitry
AAVID #
(Circuit of Figure 12)
http://onsemi.com
Trickle
Amplifier
Gate
Fast/
V
Error
Battery
Negative
R
R
Battery
Positive
sen
NTC
NTC
2
3
11
Isolation Boundary
1.0 mA
MC33340 or MC33342
UC3842 Series
q
SA
24.0
14.0
9.2
°C/W
2R
Gnd
R
1.70″
Secondary Circuitry
Gnd
5
V
Gate
F/T
sen
1.0 V
4
Current Sense
Comparator
(Bottom View)
2.25″
MC33340