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AVANTICS - AX3842 Series

Specification No.: 050308-FE0008

AX3842P / AX3842S

High Performance Current Mode Pwm Controlers

Description

The AX3842 Series is high performance fixed frequency current mode controllers.

That is specifically designed for Off-Line and DC To DC converter applications

offering the designer a costeffective solution with minimal external components.

These integrated circuits feature a trimmed oscillator for precise duty cycle control.

A temperature compensated reference, high gain error amplifier, current sensing

compara-tor, and a high current totem pole output ideally suited for driving a

power MOSFET. Also included are protective features consisting of input and

reference undervoltage lockouts each with hysteresis, cycle-by-cycle current

limiting, programmable output deadtime, and a latch for single pulse metering.

Features

• Trimmed Oscillator for Precise Frequency Control

• Oscillator Frequency Guaranteed at 250 kHz

• Current Mode Operation to 500 kHz

• Automatic Feed Forward Compensation

• Latching PWM for Cycle-By-Cycle Current Limiting

• Internally Trimmed Reference with Undervoltage Lockout

• High Current Totem Pole Output

• Undervoltage Lockout with Hysteresis

• Low Startup and Operating Current

Absolute Maximum Ratings

Symbol

Parameter

Value

Unit

V

i

Supply Voltage (low impedance source)

30

V

V

i

Supply Voltage (I

Self Limiting

I

O

Output Current

±1

A

E

O

Output Energy (capacitive load)

5

uJ

Analog Inputs (pin 2, 3)

-0.3 to 5.5

V

Error Amplifier Output Sink Current

10

mA

P

tot

Power Dissipation at T

amb

800

mW

T

stg

Storage Temperature Range

-65 to 150

T

J

Junction Operating Temperature

-40 to 150

T

L

Lead Temperature (soldering 10s)

300

Thermal Data

Symbol

Description

DIP-8

SO-8

Units

Rth j-amb

Thermal Resistance Junction-ambient

100

150

8-Lead Plastic SO-8

Package Code: S

•

8-Lead Plastic DIP-8

Package Code: P