KA3846 datasheet(3/10 Pages) FAIRCHILD

Il numero della parte	KA3846

Spiegazioni elettronici	SMPS Controller

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Produttore elettronici	FAIRCHILD [Fairchild Semiconductor]

Homepage	http://www.fairchildsemi.com

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3 / 10 page

KA3846

3

Electrical Characteristics

(VCC= 15V,TA=0°C to +70°C, unless otherwise specified)

Parameter

Symbol

Conditions

Min.

Typ.

Max.

Unit

OSCILLATOR SECTION (Note 2)

Initial Accuracy

ACCUR

TJ = 25

°C39

43

47

KHz

Frequency Change with Voltage

∆f/∆VCC

VCC = 8 to 40V

-

1

2

%

Frequency Change with

Temperature (Note 6)

∆f/∆T

-

1

-

%

Sync Output High Level

VOH(SYNC)

-

3.9

4.35

-

V

Sync Output Low Level

VOL(SYNC)

-

-2.3

2.5

V

Sync Input High Level

VIH(SYNC)

V8 = 0V

3.9

-

V

Sync Input Low Level

VIL(SYNC)

V8 = 0V

-

2.5

V

Sync Input Current

II(SYNC)

Sync Voltage = 3.9V, V8 = 0V

-

1.3

1.5

mA

ERROR AMPLIFIER SECTION

Input Offset Voltage

VIO

-

-0.5

5

mV

Input Bias Current

IBIAS

-

--0.6

-1

uA

Input Offset Current

IIO

-

40

250

uA

Common-Mode Range

VCM

VCC = 8 to 40V

0

-

VCC2V

Open Loop Voltage Gain

GVO

VO = 1.2 to 3V, VCM = 2V

80

105

-

dB

Unity Gain Bandwidth(Note 6)

BW

TJ = 25

°C0.7

1.0

-

MHz

Common Mode Rejection Ratio

CMRR

VCM = 0 to 38V, VCC = 40V

75

100

-

dB

Power Supply Rejection Ratio

PSRR

VCC = 8 to 40V

80

105

-

dB

Output Sink Current

ISINK

VIO = -15mV to 5V, V7 = 2.5V

2

6

-

mA

Output Source Current

ISOURCE

RL = 15K

Ω

-0.4

-0.5

-

mA

High Output Voltage

VOH

RL = 15K

Ω

4.3

4.6

-

V

Low Output Voltage

VOL

-

-0.7

1

V

CURRENT SENSE AMPLIFIER SECTION

Amplifier Gain (Note 1, 3)

GV

V3 = 0V, Pin 1 open

2.5

2.75

3.0

V

Maximum Differential Input

Signal (V4 - V3) (Note 1)

VI(DIFF,MAX)

RL = 15K

Ω, Pin 1 open

1.1

1.2

-

V

Input Offset Voltage (Note 1)

VIO

V1 = 0.5V, Pin 1 open

-

5

25

mV

Common Mode Rejection Ratio

CMRR

VCM = 1 to 12V

60

83

-

dB

Power Supply Rejection Ratio

PSRR

VCC = 8 to 40V

60

84

-

dB

Input Bias Current (Note 1)

IBIAS

V1 = 0.5V, Pin 7 open

-

-2.5

-10

uA

Input Offset Current (Note 1)

IIO

V1 = 0.5V, Pin 7 open

-

0.08

1

uA

Delay to Outputs (Note 6)

tD

TJ = 25

°C

-

200

500

ns

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