參數(shù)資料
型號(hào): MC33340D
廠商: MOTOROLA INC
元件分類: 穩(wěn)壓器
英文描述: BATTERY FAST CHARGE CONTROLLER
中文描述: BATTERY CHARGE CONTROLLER, 760 kHz SWITCHING FREQ-MAX, PDSO8
封裝: PLASTIC, SO-8
文件頁(yè)數(shù): 10/12頁(yè)
文件大小: 309K
代理商: MC33340D
MC33340
10
MOTOROLA ANALOG IC DEVICE DATA
Figure 14. Printed Circuit Board and Component Layout
(Circuit of Figure 13)
MC33340
2.25
1.70
C2
(Top View)
(Bottom View)
Battery
Negative
RNTC
RNTC
Battery
Positive
Input
Return
Input
Positive
R
R
IC1
3 2 1
Charge Mode
R3
R2
R8
D2
R7
R4
D
Input
RNTC
Output
D1
Figure 15. Line Isolated Switch Mode Charger
The MC33340 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 information, 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
Gnd
4
2
OC2
OC1
R3
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