KA3844 datasheet(2/7 Pages) ESTEK

部品番号	KA3844

部品情報	fixed frequency current mode PWM controller

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メーカー	ESTEK [Estek Electronics Co. Ltd]

ホームページ	http://www.estek.com.cn/en/index.asp

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Electrical characteristics

(*VCC=15V, RT=10kΩ, CT=3.3nF, TA=0

0C to +700C, unless otherwise specified)

Characteristics

Symbol

Test Conditions

Min

Typ

Max

Units

Reference Section

Reference Output Voltage

VREF

TJ = 25°C, IREF = 1 mA

4.9

5.0

5.1

V

Line Regulation

∆V

REF

12V ≤ VCC ≤ 25 V

6.0

20

Load Regulation

∆V

REF

1 mA ≤ IREF ≤ 20mA

6.0

25

mV

Short Circuit Output Current

ISC

TA = 25°C

-100

-180

mA

Oscillator Section

Oscillation Frequency

f

TJ = 25°C

MIK384XA

47

50

57

MIK384XAM

47

52

57

KHz

Frequency Change with Voltage

∆f/∆V

CC

12V ≤ VCC ≤ 25 V

0.05

1.0

%

Oscillator Amplitude

V(OSC)

(peak to peak)

1.6

V

Error Amplifier Section

Input Bias Current

IBIAS

VFB=3V

-0.1

-2

µA

Input Voltage

VI(E.A)

Vpin1 = 2.5V

2.42

2.5

2.58

V

Open Loop Voltage Gain

AVOL

2V ≤ V0 ≤ 4V

65

90

Power Supply Rejection Ratio

PSRR

12V ≤ VCC ≤ 25 V

60

70

dB

Output Sink Current

ISINK

Vpin2 = 2.7V, Vpin1 = 1.1V

2

7

mA

Output Source Current

ISOURCE

Vpin2 = 2.3V, Vpin1 = 5V

-0.5

-1.0

mA

High Output Voltage

VOH

Vpin2 = 2.3V, RL = 15KΩ to GND

5.0

6.0

Low Output Voltage

VOL

Vpin2 = 2.7V, RL = 15KΩ to PIN 8

0.8

1.1

Current Sense Section

V

Gain

GV

(Note 1 & 2)

2.85

3.0

3.15

V/V

Maximum Input Signal

VI(MAX)

V pin1 = 5V (Note1)

0.9

1.0

1.1

V

Supply Voltage Rejection

SVR

12V ≤ VCC ≤ 25 V (Note 1)

70

dB

Input Bias Current

IBIAS

Vpin3 = 3V

-3.0

-10

µA

Output Section

Low Output Voltage

VOL

High Output Voltage

VOH

ISINK = 20 mA

0.08

0.4

ISINK = 200 mA

1.4

2.2

ISINK = 20 mA

13

13.5

ISINK = 200 mA

12

13.0

V

Rise Time

tR

TJ = 25°C, CL = 1nF (Note 3)

45

150

Fall Time

tF

TJ = 25°C, CL = 1nF (Note 3)

35

150

Undervoltage Lockout Section

nS

Start Theshold

VTH(ST)

MIK3842A(AM)/44A(AM)

14.5

16.0

17.5

MIK3843A(AM)/45A(AM)

7.8

8.4

9.0

V

Min. Operating Voltage

(After Turn On)

PWM Section

VOPR(min)

MIK3842A(AM)/44A(AM)

8.5

10

11.5

MIK3843A(AM)/45A(AM)

7.0

7.6

8.2

V

Max. Duty Cycle

D(MAX)

MIK3842A(AM)/43A(AM)

95

97

100

MIK3844A(AM)/45A(AM)

47

48

50

%

Min. Duty Cycle

D(MAX)

0

Total Standby Current

Start

−Up Current

IST

MIK384XA(AM)

0.17

0.3

Operating Supply Current

ICC (OPR)

Vpin3 = Vpin2 = 0V

13

17

mA

Zener Voltage

VZ

ICC=25 mA

30

38

V

* - Adjust VCC above the start threshold before setting it to 15V.

Note 1: Parameter measured at trip point of latch with Vpin2=0.

Note 2: Gain defined as A=

∆V

pin1/∆Vpin3 ; 0 ≤ Vpin3 ≤ 0.8V.

Note 3: These parameters, although guaranteed, are not 100% tested in production.

2

BEIJING ESTEK ELECTRONICS CO.,LTD

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