UC2843BDG Current-Mode PWM Controller 500kHz Operation High Drive Output Wide 8V-30V Input Precision Reference Low Cost Robust Protection Versatile for Power Supplies

UC2843BDG Current-Mode PWM Controller 500kHz Operation High Drive Output Wide 8V-30V Input Precision Reference Low Cost Robust Protection Versatile for Power Supplies

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Features

andbull; Trimmed Oscillator for Precise Frequency Control

andbull; Oscillator Frequency Guaranteed at 250 kHz

andbull; Current Mode Operation to 500 kHz

andbull; Automatic Feed Forward Compensation

andbull; Latching PWM for Cycleandminus;Byandminus;Cycle Current Limiting

andbull; Internally Trimmed Reference with Undervoltage Lockout

andbull; High Current Totem Pole Output

andbull; Undervoltage Lockout with Hysteresis

andbull; Low Startup and Operating Current

andbull; This is a Pbandminus;Free and Halideandminus;Free Device

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Applications

1:Off-line switching power supplies (AC-DC converters): Power adapters (e.g., laptops, monitors), industrial power systems, consumer electronics (TVs, audio equipment).

2:DC-DC converters: Boost converters (battery voltage step-up), flyback converters (isolated power supplies up to 100W-150W).

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Description

The UC3842B, UC3843B series are high performance fixed frequency current mode controllers. They are specifically designed for Offandminus;Line and DCandminus;DC converter applications offering the designer a costandminus;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, cycleandminus;byandminus;cycle current limiting, programmable output deadtime, and a latch for single pulse metering.

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

The UCX842B has UVLO thresholds of 16 V (on) and 10 V (off), ideally suited for offandminus;line converters. The UCX843B is tailored for lower voltage applications having UVLO thresholds of 8.5 V (on) and 7.6 V (off).

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INFORMATION

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Drawing

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