MC33342 Просмотр технического описания (PDF) - ON Semiconductor

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Компоненты Описание

производитель

MC33342

Battery Fast Charge Controllers

ON Semiconductor 

MC33340, MC33342

Q

DQ

11 ms Preset

22 ms Convert

Oscillator

760 kHz

Switch 2

211

÷23

÷26

÷22

95 kHz

SCK to

Voltage to

Frequency

Converter

Switch 3A

Test Normal

25

÷23

÷21

÷25

÷28

÷22

Switch 3B

211

Switch 1

219

MC33340

Holdoff Time Signal MC33342

Each test mode bypass switch is shown

in the proper position for normal charger operation.

t1/TrefHigh

t2/Tsen

t3/TrefLow

Figure 11. Timer Functional Block Diagram

÷2 ÷2 ÷2 ÷2

Time and Test Decoder

Fast/Trickle Output

C2

R5

1.0 k D3

IC1 MC33340 or MC33342 VCC 8

0.1

Undervoltage

Lockout

AC

1N4002

Internal Bias

VCC

Line

Input

D2 R2 Vsen

Voltage to

Frequency

2.9 V

RNTC

10 k

LM317

IC2

R7

DC

Input

IAdj

2.4

R8

220

1

R1

C1

0.01

Converter

Over

Temp

Ck F/V R R Latch

2.0 V

1.0 V

High

Battery

Detect

Low

Over

Under

QS

Temp

Detect

Battery

Pack

R6

1.8 k

D4

D1

Charge

Status

ǒ Ǔ R2 + R1

VBatt

Vsen

–

1

Ichg(fast)

+

Vref

) (IAdj

R7

R8)

Vsen

Gate

2

3

Fast/

Trickle

t1

−DV Detect

Counter

Timer t2

Vsen

Gate

t3

F/T

t/T

Time/Temp

Select

30 mA t1/Tref High

7

SW1 R3

30 mA t2/Tsen

6

SW2

30 mA t3/Tref Low

5

VCC

SW3 R4

0.6 V

Ichg(trickle)

+

Vin

–

Vf(D3)

R5

–

VBatt

Gnd 4

This application combines the MC33340/342 with an adjustable three terminal regulator to form an isolated secondary side battery charger. Regulator IC2

operates as a constant current source with R7 setting the fast charge level. The trickle charge level is set by R5. The R2/R1 divider should be adjusted so

that the Vsen input is less than 2.0 V when the batteries are fully charged. The printed circuit board shown below will accept the several TO−220 style heat-

sinks for IC2 and are all manufactured by AAVID Engineering Inc.

Figure 12. Line Isolated Linear Regulator Charger

http://onsemi.com

10

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