MC33340 查看數據表（PDF） - ON Semiconductor

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产品描述 (功能)

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MC33340

Battery Fast Charge Controllers

ON Semiconductor 

MC33340, MC33342

AAVID #

592502B03400

593002B03400

590302B03600

qSA °C/W

24.0

14.0

9.2

Input

Charge Mode

Return

Input

Positive

Input

R4

D1

ÎÎÎÎÎC1

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎD3

ÎÎÎÎÎÎÎÎÎÎ IC2

321

RNTC

R3

IC1

C2

R2

R8

R7

Output

D2

Battery

Negative

RNTC

RNTC

Battery

Positive

1.70″

2.25″

MC33340

(Top View)

Figure 13. Printed Circuit Board and Component Layout

(Circuit of Figure 12)

(Bottom View)

VCC

R2

Voltage

Feedback

Input

UC3842 Series

1.0 mA

2R

R1

2

Error

Amplifier

1

Output/

Compensation

R 1.0 V

Gnd 5

Current Sense

Comparator

Primary Circuitry

Isolation Boundary

OC2

VBattery

Secondary Circuitry

R3

OC1

Vsen

Gate

2

3

Fast/

Trickle

MC33340 or MC33342

Vsen

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

http://onsemi.com

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