UC3845BD1R2 - onsemi

Manufacturer Part Number

UC3845BD1R2

Manufacturer

onsemi

Introduction

The UC3845BD1R2 is a high-performance fixed-frequency current-mode controller for off-line and DC-to-DC converter applications.

Product Features and Performance

Fixed-frequency current-mode operation

Optimized for off-line and DC-to-DC converters

Low startup current (<1 mA)

Automatic feed-forward compensation

Pulse-by-pulse current limiting

Enhanced load response characteristics

Under-voltage lockout with hysteresis

Double pulse suppression

High-current totem pole output

Internally-trimmed bandgap reference

500 kHz operation

Product Advantages

Highly efficient control for switching power supplies

Low power operation and power-saving mode reduces energy consumption

Proven robustness and reliability for industrial applications

Key Technical Parameters

Output Type: Transistor Driver

Function: Step-Up, Step-Up/Step-Down

Output Configuration: Positive, Isolation Capable

Topology: Boost, Flyback

Number of Outputs: 1

Output Phases: 1

Voltage - Supply (Vcc/Vdd): 7.6V ~ 30V

Frequency - Switching: Up to 500kHz

Duty Cycle (Max): 48%

Synchronous Rectifier: No

Operating Temperature: 0°C ~ 70°C (TA)

Mounting Type: Surface Mount

Package / Case: 8-SOIC

Quality and Safety Features

Under-voltage lockout ensures stability and safety

Pulse-by-pulse current limiting prevents overcurrent conditions

Temperature stability and reliability through the specified operating range

Compatibility

Compatible with various topologies including Boost and Flyback

Suitable for high-switching-frequency applications

Application Areas

Switch-mode power supplies (SMPS)

DC-to-AC inverters

Power factor correction (PFC) circuits

DC-to-DC converters

Product Lifecycle

Obsolete - Consider newer alternatives or direct replacements

Several Key Reasons to Choose This Product

Provides a robust and cost-effective solution for power conversion systems

Integrated features reduce external components and simplify design

Versatile applications ranging from AC-to-DC and DC-to-DC converters

High switching frequency for more compact power supply design

Renowned manufacturer with a track record of reliability and performance