UC3843BD1013TR SMD IC PWM CONTROLLER 3843 SOIC8 ST UC3843BD1013TR

Product Overview:

A high-performance monolithic current-mode pulse-width modulation (PWM) controller integrated circuit designed for efficient off-line or DC-to-DC power conversion schemes. Engineered to implement fixed-frequency control with a minimal external parts count, it integrates a trimmed oscillator, an error amplifier, a precision voltage reference, a latching PWM comparator, and a high-current totem-pole output stage perfectly optimized for driving N-Channel power MOSFETs.

Core Specifications:

Manufacturer: STMicroelectronics

Package Type: Minidip (Dual In-line) and SO8 (Small Outline)

Function: High Performance Current Mode PWM Controller

Input Channels: 2 Analog Feedback Channels (1 Voltage Feedback input [VFB] and 1 Current Sense input [ISENSE])

Control Interface: Analog PWM Control Interface featuring standard oscillator timing (RT/CT) and an error amplifier output node (COMP)

Features

• High Frequency Current Mode Control: Supports stable current-mode power regulation up to an operational frequency of 500 kHz.

• Precise Duty Cycle Tuning: Features a factory-trimmed internal oscillator guaranteed to maintain predictable frequency control at 250 kHz.

• Automatic Feed Forward Compensation: Natively adjusts to input voltage variations to maximize system regulation and transient performance.

• Robust Cycle-by-Cycle Protection: Utilizes a dedicated latching PWM logic structure to instantly clamp peak transformer current on every single clock pulse.

• Ultra-Low Current Standby Startup: Minimizes vampire power consumption with a specialized standby startup current of less than 0.5 mA.

• High Current Drive Capability: Totem-pole output driver is physically engineered to source or sink high peak currents rapidly, ensuring fast switching of power MOSFET gates.

• Undervoltage Lockout with Hysteresis: Built-in undervoltage supervisor tracks input supply limits to cleanly shut down or enable the device without chatter.

Applications

• Off-Line Switch Mode Power Supplies (SMPS): Drives primary-side flyback, forward, or buck topologies inside AC-to-DC wall adapters and power bricks.

• Industrial High-Power DC-to-DC Converters: Standardizes voltage conversion layers for telecommunication nodes and factory automation control systems.

• Battery Charging Stations: Manages constant-current and constant-voltage boundaries safely for high-voltage energy storage systems.

• Consumer Electronic Subsystem Supplies: Acts as the main power controller within televisions, computing monitors, and major domestic appliances.