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PJ3842B

High Performance Current Mode Controller

Promax Johnton 

PJ3842B / PJ3843B

High Performance Current Mode Controller

T he PJ3842B and PJ3843B series are high performance

fixed frequency current mode controllers. This is

cycle-by-cycle current limiting, programmable output

deadtime, and a latch for single pulse metering.

specifically designed for Off-Line and DC-to-DC converter

This device is available in 8-pin dual-in-line plastic

applications offering the designer a cost effective solution packages as well as the 8-pin plastic surface mount (SOP-8).

with minimal external components.This integrated circuits The SOP-8 package has separate power and ground pins for

feature a trimmed oscillator for precise duty cycle control, a the totem pole output stage.

temperature compensated reference, high gain error amplifier,

The PJ3842B has UVLO thresholds of 16V (on) and 10V

current sensing comparator,and a high current totem pole (off), ideally suited for off-line converters. The PJ3843B is

output ideally suited for driving a power MOSFET.

tailored for lowervoltage applications having UVLO

Also included are protective features consisting of input thresholds of 8.5V (on) and 7.6V (off).

and reference undervoltage lockouts each with hysteresis,

FEATURES

• Trimmed Oscillator Discharge Current for Precise Duty

Cycle Control

• Current Mode Operation to 500KHz

• 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 Hystersis

• Low Start-Up and Operating Current

DIP-8

SOP-8

Pin：1. Compensation

Pin：2. Voltage Feedback

Pin：3. Current Sense

Pin：4. RT/CT

5. Gnd

6. Output

7. Vcc

8. Vref

ORDERING INFORMATION

Device

PJ3842/3843BCD

PJ3842/3843BCS

Operating Temperature

(Ambient)

Package

-20℃ TO +85℃

DIP-8

SOP-8

SIMPLIFIED BLOCK DIAGRAM

The document contains information on a new product.Specifications and information herein are subject to change without notice.

1-14

2004/11.Rev B

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