KA7541 datasheet(2/14 Pages) FAIRCHILD

Part #	KA7541

Description	Simple Ballast Controller

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Manufacturer	FAIRCHILD [Fairchild Semiconductor]

Direct Link	http://www.fairchildsemi.com

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KA7541

2

Internal Block Diagram

Absolute Maximum Ratings

Absolute Maximum Ratings (-25

°°°°C≤≤≤≤Ta≤≤≤≤125°°°°C)

Parameter

Symbol

Value

Unit

Supply voltage

VCC

30

V

Peak drive output current

IOH, IOL

±300

mA

Drive output clamping diodes

VO>VCC, or VO<

−0.3

Iclamp

±10

mA

Soft start, and no lamp detection input voltage

VIN

−0.3 to 6

V

Operating temperature range

Topr

-25 to 125

°C

Storage temperature range

Tstg

−65 to 150

°C

Power dissipation

8-DIP

Pd

0.8

W

8-SOP

0.5

Thermal resistance (Junction-to-air)

8-DIP

θja

100

°C/W

8-SOP

165

Parameter

Symbol

Value

Unit

Temperature stability for reference voltage (Vref)

∆Vref(Typ)

15

mV

Temperature stability for operating frequency (fos)

∆fos(Typ)

5

kHz

CS

0.22

µF

1

2

3

4

5

6

7

8

Ct

RS

Ldet

180pF

−

+

Vref

IH

Ict

2V Ref

Internal

bias

+

−

+

IC

1.8V

9.5V

F.D

UVLO

Frequency

divider

−

+

Shut down signal

40k

Ω

5pF

2V

+

−

8Ict

latch

Q

IH = Ik

× (Vref − VSS) / Vref

IS = Vref / RS

VCC

OUT 1

OUT 2

GND

3pF

Current

mirror

VZ

Ik = IS / 6

VCC

Vref

Oscilator

IS

22k

Ω

2.5

µA

30k

Ω

2k

Ω

+

-

+

3V

1V

Oscilator

S

R

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