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UC3843AD8TR

TIUC3843AD8TR

Texas Instruments
Boost, Buck, Flyback, Forward Converter Regulator Output DC-DC Controller IC 8-SOIC
NRND4,032 in stock
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Overview

The UC3843AD8TR is a high-performance current-mode PWM controller designed for off-line and DC-DC converter applications. It features a trimmed oscillator for precise duty cycle control, a high-current totem pole output for driving external MOSFETs, and undervoltage lockout (UVLO) optimized for lower voltage thresholds. This controller is capable of operating at frequencies up to 500kHz, making it suitable for compact power supply designs.

Why Choose This Part

This controller offers enhanced load response characteristics and double pulse suppression to ensure stable power delivery. It provides an internally-trimmed bandgap reference and high-current output capable of sourcing and sinking up to 1A peak, simplifying the gate drive circuitry for power MOSFETs.

Applications

Off-line Switch Mode Power Supplies
Utilized in AC-to-DC converters where current-mode control provides superior line regulation and pulse-by-pulse current limiting.
DC-DC Boost Converters
Provides efficient voltage step-up control with automatic feedforward compensation for stable operation.
Flyback Converters
Ideal for multi-output isolated power supplies in industrial and consumer electronics.
Battery Operated Equipment
Leverages a low start-up current of less than 0.5mA to minimize standby power losses in portable systems.

Key Specifications

Topology Boost, Buck, Flyback, Forward Converter
Clock Sync No
Output Type PWM
Mounting Type Surface Mount
Package / Case 8-SOIC (0.154", 3.90mm Width)
Duty Cycle (Max) 100%
Number of Outputs 1
Frequency - Switching Up to 500kHz
Operating Temperature 0degC ~ 70degC (TA)
Supplier Device Package 8-SOIC

Getting Started

To begin design, calculate the timing resistor and capacitor for the desired switching frequency up to 500kHz using the datasheet formulas. Ensure the VDD supply remains between 11V and 30V for proper operation, and place a bypass capacitor close to the VCC pin to handle high-current transients from the totem pole output.

Also Consider

UC3845AD8TR TITexas Instruments - Similar architecture but limits the maximum duty cycle to 50 percent for applications preventing transformer saturation.

Categories

Power Management > DC-DC Converters