HIGH PERFORMANCE CURRENT MODE CONTROLLERS

 

 

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 Motorola SENSEFET Products

 

 

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