Professional IC Distribution & Technical Solutions

Global leader in semiconductor components distribution and technical support services, empowering your product innovation and industry advancement

Product Catalog Contact Us
Home > ST04 > 3843B

3843B Specifications

Detailed technical information and Application Scenarios

Product Details

PartNumberManufactorQuantityAvailability
3843BST119Yes

STMicroelectronics 3843B** is a **PWM (Pulse Width Modulation) controller** IC designed for **offline and DC-to-DC converter applications**.

The STMicroelectronics 3843B is a PWM (Pulse Width Modulation) controller IC designed for offline and DC-to-DC converter applications. Below are the specifications, descriptions, and features based on manufacturer data:

Key Specifications:

  • Part Number: UC3843B (STMicroelectronics variant)
  • Type: Current-Mode PWM Controller
  • Operating Voltage Range: 8.5V to 30V
  • Start-Up Voltage: 8.5V (min)
  • Under-Voltage Lockout (UVLO):
  • Turn-On Threshold: 8.5V (typ)
  • Turn-Off Threshold: 7.6V (typ)
  • Output Drive Current: ±1A (peak)
  • Switching Frequency: Up to 500kHz
  • Duty Cycle Range: 0% to 100%
  • Error Amplifier Gain Bandwidth: 1MHz (typ)
  • Operating Temperature Range: -40°C to +85°C
  • Package Options: SO-8, DIP-8, PDIP-8

Description:

The UC3843B is a fixed-frequency current-mode PWM controller, optimized for high-performance power supply designs. It features low startup current, precision reference voltage, and cycle-by-cycle current limiting. It is widely used in flyback, forward, and boost converters.

Key Features:

  • Current-Mode Control for improved transient response.
  • Internal Trimmed Reference Voltage (5V ±1%).
  • Latching PWM for Cycle-by-Cycle Current Limiting.
  • Low Startup Current (0.5mA typ).
  • Single-Ended Output with 1A Peak Drive Capability.
  • Adjustable Oscillator Frequency with External RT/CT.
  • Undervoltage Lockout (UVLO) with Hysteresis.

Applications:

  • AC/DC Converters
  • DC/DC Converters
  • Battery Chargers
  • SMPS (Switched-Mode Power Supplies)
  • LED Drivers

For detailed electrical characteristics, refer to the STMicroelectronics datasheet (UC3843B).

Request Quotation

Part Number:
Quantity:
Target Price($USD):
Email:
Contact Person:
Additional Part Number
Quantity (Additional)
Special Requirements
Verification: =

Recommended Products

  • STM32F103ZGH6 ,1104,BGA-144年份：12+

    STM32F103ZGH6** is a high-performance microcontroller from STMicroelectronics, part of the STM32F1 series based on the ARM Cortex-M3 core.

  • STM8S103F3P6 ,53788,TSSOP-20

    ### **Manufacturer:** STMicroelectronics ### **Part Number:** STM8S103F3P6 ### **Specifications:** #### **Core & Architecture:** - **Core:** STM8 8-bit core - **Max Clock Speed:** 16 MHz - **Instruction Set:** STM8 #### **Memory:**

  • M25P80-VMN6TP ,3101,

    M25P80-VMN6TP** is a serial flash memory device manufactured by **STMicroelectronics (ST)**.

  • 78D05AL,UTC,12,TO252

    76RSB08S,GRAYHILL,12,DIP16

Sales Support

Our sales team is ready to assist with:

  • Fast quotation
  • Price Discount
  • Technical specifications
Contact sales