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UC3845BD Specifications

Detailed technical information and Application Scenarios

Product Details

PartNumberManufactorQuantityAvailability
UC3845BDST394Yes

UC3845BD** is a current-mode PWM controller manufactured by **STMicroelectronics (ST)**.

The UC3845BD is a current-mode PWM controller manufactured by STMicroelectronics (ST). Below are its specifications, descriptions, and features:

Specifications:

  • Manufacturer: STMicroelectronics
  • Type: Current-Mode PWM Controller
  • Topology: Flyback, Forward, Boost, Buck
  • Operating Voltage Range: 8.5V to 30V
  • Output Current: 1A (Peak)
  • Switching Frequency: Up to 500kHz
  • Duty Cycle Range: 0% to 100% (Adjustable)
  • Error Amplifier Bandwidth: 1MHz
  • Start-Up Current: <1mA
  • Undervoltage Lockout (UVLO): 8.4V (Turn-On), 7.6V (Turn-Off)
  • Operating Temperature Range: -40°C to +85°C
  • Package: SOIC-8

Descriptions:

The UC3845BD is a high-performance fixed-frequency current-mode PWM controller designed for DC-DC converter applications. It features an integrated oscillator, temperature-compensated reference, high-gain error amplifier, and current-sensing comparator. The device is optimized for offline and DC-DC power supplies with precise duty cycle control and protection features.

Features:

  • Current-Mode Operation for improved loop response
  • Automatic Feed-Forward Compensation
  • Latching PWM for cycle-by-cycle current limiting
  • Internal Trimmed Bandgap Reference (5V ±1%)
  • High-Current Totem-Pole Output (1A Peak)
  • Low Start-Up and Operating Current
  • Undervoltage Lockout (UVLO) with hysteresis
  • Pulse-by-Pulse Current Limiting
  • 500kHz Oscillator Frequency (adjustable with external components)
  • SOIC-8 Package for compact designs

The UC3845BD is commonly used in power supply applications such as AC-DC converters, battery chargers, and SMPS (Switched-Mode Power Supplies).

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