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MC33342D Datasheet(PDF) 11 Page - ON Semiconductor

tên linh kiện MC33342D
Nội dung chi tiết  Battery Fast Charge Controllers
tải về  16 Pages
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nhà sản xuất  ONSEMI [ON Semiconductor]
Trang chủ  http://www.onsemi.com
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MC33340, MC33342
http://onsemi.com
11
AAVID #
qSA °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
RNTC
RNTC
Battery
Positive
Input
Return
Input
Positive
IC2
IC1
32 1
Charge Mode
R3
R2
R8
D2
R7
R4
D3
Input
C1
RNTC
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.
VBattery
Current Sense
Comparator
Error
Amplifier
Vsen
Gate
Fast/
Trickle
Voltage
Feedback
Input
VCC
Gnd
5
3
2
1
Vsen
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



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