KA7552A datasheet(2/6 Pages) FAIRCHILD

部件名	KA7552A

功能描述	SMPS Controller

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制造商	FAIRCHILD [Fairchild Semiconductor]

网页	http://www.fairchildsemi.com

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2 / 6 page

KA7552A/KA7553A

2

Absolute Maximum Ratings

Electrical Characteristics

(VCC = 18V, FOSC = 135kHz, TA = 25°C, unless otherwise specified)

Parameter

Symbol

Value

Unit

Supply voltage

VCC

30

V

Output current

IO

±1.5

A

Input voltage at overcurrent detection pin

VIN(IS)

-0.3 to 4

V

Input voltage at FB pin

VIN(FB)

4V

Input current at CS pin

IIN(CS)

2mA

Total power dissipation (Ta = 25

°C)

PD

800

mW

Operating temperature

TOPR

-25 to 85

°C

Storage temperature range

TSTG

-65 to 150

°C

Junction temperature

Tj

+125

°C

Parameter

Symbol

Conditions

Min. Typ. Max. Unit

OSCILLATOR SECTION

Initial accuracy

FOSC

CT = 360pF, TJ = 25°C

125

135

145

kHz

Frequency variation 1

∆F/∆VVCC = 10V to 30V

-

±1

±3%

Frequency variation 2(Note1)

∆F/∆VTA = 25°C to 85°C-

±1.5

-

%

Ramp high voltage

VRH

CT = 360pF, TJ = 25°C

2.80 3.08 3.30

V

Ramp low voltage

VRL

CT = 360pF, TJ = 25°C

0.6

0.9

1.2

V

Amplitude

VOSC

VPIN7, peak to peak

1.80 2.18 2.50

V

PULSE WIDTH MODULATION SECTION

Input threshold voltage(pin2)

VTH(FBD)

Duty cycle = 0%

0.6

0.75 0.95

V

Input threshold voltage(pin2)(Note1)

VTH(FB1) (KA7552)

Duty cycle = Dmax 1

2.1

2.3

2.6

V

VTH(FB2) (KA7553)

Duty cycle = Dmax 2

1.6

1.8

2.1

V

Max. duty cycle

D(Max1) (KA7552)

-

66

70

74

%

D(Max2) (KA7553)

-

43

46

49

%

Source current(pin2)

ISOURCE(FB)

VPIN2 = 0V

-660 -800 -960

uA

OVERCURRENT LIMIT SECTION

Input threshold voltage

VTH(IS)

-

0.21 0.24 0.27

V

Source current(pin3)

ISOURCE(IS)

VPIN3 = 0V

-300 -200 -100

uA

Deley time(Note1)

TD

-

150

-

ns

SOFT START SECTION

Charging current

ICHG

VPIN8 = 0V

-15

-10

-5

uA

Input threshold voltage(pin8)

VTH(CSO)

-

0.7

0.9

1.1

V

Input threshold voltage(pin8)(Note1)

VTH(CS1) (KA7552)

Duty cycle = Dmax 1

2.2

2.4

2.6

V

VTH(CS2) (KA7553)

Duty cycle = Dmax 2

1.7

1.9

2.1

V

LATCH MODE SHUTDOWN CIRCUIT SECTION

Sink current(pin8)

ISINK(CS)

VPIN8 = 6V, VPIN2 = 1V

25

45

65

uA

Shutdown threshold voltage

VTH(SD,CS)

-

6.7

7.2

7.7

V

OVERLOAD SHUTDOWN SECTION

Shutdown threshold voltage

VTH(SD,FB)

-

2.6

2.8

3.1

V

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