KA3842 datasheet(2/5 Pages) WINGS

Part #	KA3842

Description	Linear Integrated Circuit(CURRENT-MODE PWM CONTROLLER)

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Manufacturer	WINGS [Wing Shing Computer Components]

Direct Link	http://www.wingshing.com/en

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2 / 5 page

Electrical characteristics (*VCC=15V, RT=10kΩ

Ω, CT=3.3nF, TA=00C to +700C, unless

otherwise specified)

Characteristics

Symbol

Test Condition

Min

Typ

Max

Unit

Reference Section

Reference Output Voltege

VREF

TJ = 25°C, IREF = 1 mA

4.9

5.0

5.1

V

Line Regulation

∆VREF

12V

≤ VCC ≤ 25 V

6.0

20

mV

Load Regulation

∆VREF

1 mA

≤ IREF ≤ 20mA

6.0

25

Short Circit Output Current

ISC

TA = 25°C

-100

-180

mA

Oscillator Section

Oscillation Freguency

f

TJ = 25°C

47

52

57

KHz

Frequency Change with

Voltage

∆f/∆VCCF

12V

≤ VCC ≤ 25 V

0.05

1.0

%

Oscillator Amplitude

V(OSC)

1.6

Vp-p

Error Amplifier Section

Input Bias Current

IBIAS

-0.1

-2

µA

Input Voltage

VI(E.A)

V1 = 2.5V

2.42

2.5

2.58

V

Open Loop Voltage Gain

GVO

2V

≤ V0 ≤ 4V

65

90

dB

Power Supply Rejection Ratio

PSRR

12V

≤ VCC ≤ 25 V

60

70

Output Sink Current

ISINK

V2 = 2.7V, V1 = 1.1V

2

7

mA

Output Source Current

ISOURCE

V2 = 2.3V, V1 = 5V

-0.5

-1.0

mA

High Output Voltage

VOH

V2 = 2.3V, RL = 15KΩ to GND

5.0

6.0

V

Low Output Voltage

VOL

V2 = 2.7V, RL = 15KΩ to PIN 8

0.8

1.1

Current Sense Section

Gain

GV

(Note 1 & 2)

2.85

3.0

3.15

V/V

Maximum Input Signal

VI(MAX)

V1 = 5V (Note1)

0.9

1.0

1.1

V

Power Supply Rejection Ratio

PSRR

12V

≤ VCC ≤ 25 V (Note 1)

70

dB

Input Bias Current

IBIAS

-3.0

-10

µA

Output Section

Low Output Voltage

VOL

ISINK = 20 mA

0.08

0.4

ISINK = 200 mA

1.4

2.2

V

High Output Voltage

VOH

ISINK = 20 mA

13

13.5

ISINK = 200 mA

12

13.0

Rise Time

tR

TJ = 25°C, CL = 1nF (Note 3)

45

150

nS

Fall Time

tF

TJ = 25°C, CL = 1nF (Note 3)

35

150

Under

−−Voltage Lockout Section

Start Theshold

VTH(ST)

14.5

16.0

17.5

V

Min. Operating Voltage

VOPR(min)

8.5

10

11.5

V

(After Turn On)

PWM Section

Max. Duty Cycle

D(MAX)

95

97

100

%

Min. Duty Cycle

D(MAX)

0

Total Standby Current

Start

−Up Current

IST

0.17

0.3

mA

Operating Supply Current

ICC (OPR)

V3 = V2 = 0V

14

17

Zener Voltage

VZ

30

38

V

* Adjust VCC above the start threshold before setting at 15V

Note 1: Parameter measured at trip point of lath with V2=0

Note 2: Gain defined as A=

∆V1/∆V3 ; 0 ≤ V3 ≤ 0.8V

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

2

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