KA7541 datasheet(4/14 Pages) FAIRCHILD

Part #	KA7541

Description	Simple Ballast Controller

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Manufacturer	FAIRCHILD [Fairchild Semiconductor]

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KA7541

4

Electrical Characteristics

Unless otherwise specified, for typical values Vcc=14V, Ta=25oC, For Min/Max values Ta is the operating ambient

temperature range with

-25oC

≤ Ta ≤ 125oC and 11V ≤ VCC ≤ 30V

Note:

1. These parameters, although guaranteed, are not 100% tested in production.

Parameter

Symbol

Conditions

Min.

Typ.

Max.

Unit

UNDER VOLTAGE LOCK OUT SECTION

Start threshold voltage

VTH(st)

VCC increasing

8.5

9.5

10.5

V

UVLO hysteresis

HY(st)

-

1.3

1.8

2.3

V

SUPPLY CURRENT SECTION

Start up supply current

IST

VCC<VTH(st)

-

0.15

0.25

mA

Operating supply current

ICC

Output not switching

-

6

10

mA

Dynamic operating supply current

IDCC

50kHz, CI=1nF

-

7

14

mA

REFERENCE SECTION

Reference voltage

Vref

Iref=0mA, Vcc

=14V

1.95

2

2.05

V

Line regulation

∆Vref 1

14V

≤VCC≤25V

-

0.1

10

mV

Temperature stability of Vref

∆Vref 2

-25

≤Ta≤125°C, Vcc=14V

-

15

-

mV

OSCILLATOR SECTION

Operating frequency

fos

VSS=3V, CT=470pF

44

50

56

KHz

Operating dead time

tod

VSS=3V, Vcc

=14V

2.4

2.9

3.4

µs

Soft start frequency

fss

VSS=0V, CT=470pF

56

65

74

KHz

Soft start dead time

tsd

VSS=0V, Vcc

=14V

1.8

2.3

2.8

µs

OUTPUT SECTION

Rising time (note1)

tr

CI=1nF, Vcc

=12V

-

120

200

ns

Falling time (note1)

tf

CI=1nF, Vcc

=12V

-

50

100

ns

Maximum output voltage

Vomax(o)

VCC=20V

12

15

18

V

Output voltage with UVLO activated

Vomin(o)

VCC=5V, IO=100

µA-

-

1

V

NO LAMP PROTECTION SECTION

No lamp detect voltage

Vnd

-

1.9

2

2.1

V

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