KA7543 Ver la hoja de datos (PDF) - Fairchild Semiconductor

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KA7543

Advanced Feedback Dimming Ballast Control IC

Fairchild Semiconductor 

KA7543

Internal Block Diagram

OUT1 1

Output stage

14 OUT2

NC

Vcc

Cc

V5

Vfb

Vab

2

UVLO

9.5V

- 1.8V

3

+

Reset Cs

7V Vz

Supply

sw

2V Vref

(bandgap)

2V

Internal

bias

7V

bias

4

5.7V

2V

5V regulator

+

5

-

5/2

5.7V

is

Current amp

6

-

Gm

Vr +

5kΩ

1/2

ir

+

-

id

is-id

30kΩ

7

+

3pF

-

2V

SQ

RQ

Frequency

divider

Protection reset

+

-

+

+ Limiter

2V

QR

QS

-

-

+

+

4V

-

+

Oscillator

1V

0.7V

13

ict

55pF

8ict

12

sw

NC

GND

Dimming starter -

+

11 Cdm

4V

11µA

Mirror

isr

5V

+

Gm +

-

10 Cs

2V

Switch

-

20kΩ

Soft starter

+

Mirror

idr

20kΩ

+

+

-

Dimmer

9

2V

Vdm

Selecter -

+

3V

-

8 Vld

5pF

+

1V

Abnormal protection

No-lamp pretection

2

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