KA3843 datasheet(6/7 Pages) ESTEK

Part #	KA3843

Description	fixed frequency current mode PWM controller

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Manufacturer	ESTEK [Estek Electronics Co. Ltd]

Direct Link	http://www.estek.com.cn/en/index.asp

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6 / 7 page

RT

(K

)

Ω

Typical Performance Characteristics

%

50

C

5nF

50

30

C

1nF

C

5nF

C

2nF

20

C

500pF

C

10nF

10

C

200pF

5

C

10nF

5

3

C

100pF

V

=

15 V

2

VCC = 15

2

CC

O

1

T

O

25

C

1

T

=

25

10

20

30

50

100

200

300

500

f

KHz)

10

20

30

50

100

200

300

500

f

KHz)

Dm ax

(%)

Figure 1. Timing Resistor vs. Oscillator Frequency.

(d B)

Figure 2. Output Dead-Time vs. Oscillator Frequenc

.y

90

80

VCC = 15 V

VO = 2V to 4V

80

60

R

=

L

100K

O

25

C

70

40

60

V

=

CC

15 V

3.3nF

20

50

T

=

25

0

40

1

2

3

5

R (

T

-20

10

100

1K

10K

100K

1M

f (Hz)

Vth

(V)

1.0

Figure 3. Maximum Output Duty Cycle vs.

Timing Resistor (MIK3842/4

.3)

VCC = 15V

ISC

(mA)

100

Figure 4.

Error Amp Open-Loop Gain vs.

Fr

.

equency

VCC = 15 V

0.8

90

0.6

T

O

125 C

T

O

25 C

80

0.4

70

0.2

60

0

2

4

V

(O

50

0

25 50

75

100

T

O

)

Figure 5.

Current Sense Input Threshold vs.

Error Amp Output Voltage.

Figure 6.

Reference Short Circuit Current vs.

Temperature.

6

BEIJING ESTEK ELECTRONICS CO.,LTD

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KA3843 Datasheet(PDF) 6 Page - Estek Electronics Co. Ltd

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