High Performance Current Mode Controller

Obsolete

Overview

The UC3842A, UC3843A series of high performance fixed frequency current mode controllers are specifically designed for off-line and dc-to-dc converter applications offering the designer a cost effective 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 comparator, 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.

These devices are available in an 8-pin dual-in-line plastic package as well as the 14-pin plastic surface mount (SO-14). The SO-14 package has separate power and ground pins for the totem pole output stage.

The UCX842A has UYLO thresholds of 16 V (on) and 10 V (off), ideally suited for off-line converters. The UCX843A is tailored for lower voltage applications having UVLO thresholds of 8.5 V (on) and 7.6 V (off).

  • Trimmed Oscillator Discharge Current for Precise Duty Cycle Control
  • 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
  • Direct Interface with ON Semiconductor SENSEFET Products
  • Pb-Free Packages are Available

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Package Type

Case Outline

MSL Type

MSL Temp (°C)

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Control Mode

fsw Typ (kHz)

Stand-by Mode

UVLO (V)

Short Circuit Protection

Latch

Soft Start

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Reference Price

UC3843AD

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Obsolete

CAD Model

Pb

A

H

P

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1

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TUBE - Tube

1

N

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Current Mode

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30

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Price N/A

More Details

UC3843AN

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Obsolete

CAD Model

Pb

A

H

P

-

-

-

-

TUBE - Tube

1

N

-

Current Mode

-

-

-

-

-

-

30

-

Price N/A

More Details

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