KA3843AM datasheet(2/9 Pages) WINGS

2 / 9 page

Current Mode PWM Controller

Electrical characteristics (*VCC=15V, RT=10kΩ, CT=3.3nF, TA=00C to +700C, unless otherwise

specified)

Characteristics

Symbol

Test Condition

Min

Typ

Max

Unit

Reference Section

Reference Output Voltage

VREF

TJ = 25°C, IREF = 1 mA

4.9

5.0

5.1

Line Regulation

∆VREF

12V

≤ VCC ≤ 25 V

6.0

Load Regulation

∆VREF

1 mA

≤ IREF ≤ 20mA

6.0

Short Circuit Output Current

ISC

TA = 25°C

-100

-180

Oscillator Section

384XA

Oscillation Frequency

TJ = 25°C

384XAM

KHz

Frequency Change with

Voltage

∆f/∆VCC

12V

≤ VCC ≤ 25 V

0.05

1.0

Oscillator Amplitude

V(OSC)

(peak to peak)

1.6

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

Open Loop Voltage Gain

AVOL

≤ V0 ≤ 4V

Power Supply Rejection Ratio

PSRR

12V

≤ VCC ≤ 25 V

Output Sink Current

ISINK

Vpin2 = 2.7V, Vpin1 = 1.1V

Output Source Current

ISOURCE

Vpin2 = 2.3V, Vpin1 = 5V

-0.5

-1.0

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

Gain

(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

Supply Voltage Rejection

SVR

12V

≤ VCC ≤ 25 V (Note 1)

Input Bias Current

IBIAS

Vpin3 = 3V

-3.0

-10

µA

Output Section

Low Output Voltage

VOL

ISINK = 20 mA

0.08

0.4

ISINK = 200 mA

1.4

2.2

High Output Voltage

VOH

ISINK = 20 mA

13.5

ISINK = 200 mA

13.0

Rise Time

TJ = 25°C, CL = 1nF (Note 3)

150

Fall Time

TJ = 25°C, CL = 1nF (Note 3)

150

Undervoltage Lockout Section

Start Theshold

VTH(ST)

3843A(AM)

7.8

8.4

9.0

Min. Operating Voltage

VOPR(min)

(After Turn On)

3843A(AM)/45A(AM)

7.0

7.6

8.2

PWM Section

Max. Duty Cycle

D (MAX)

3842A(AM)/43A(AM)

100

Min. Duty Cycle

D(MAX)

Total Standby Current

Start

−Up Current

IST

384XA(AM)

0.17

0.3

Operating Supply Current

ICC (OPR)

Vpin3 = Vpin2 = 0V

Zener Voltage

ICC=25 mA

* 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=

∆Vpin1/∆Vpin3 ; 0 ≤ Vpin3 ≤ 0.8V.

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

KA3843A(AM)

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