Description

The UC3845BD1G is a high-performance fixed frequency current mode controller specifically designed for Off-Line and dc-dc converter applications. It offers a cost-effective solution with minimal external components. This integrated circuit features an oscillator, a temperature-compensated reference, high gain error amplifier, current sensing comparator, and a high current totem pole output, ideally suited for driving a power MOSFET.

Specifications and features

• Trimmed Oscillator for Precise Frequency Control
• Oscillator Frequency Guaranteed at 250 kHz
• Current Mode Operation to 500 kHz Output Switching Frequency
• Output Deadtime Adjustable from 50% to 70%
• Automatic Feed Forward Compensation
• Latching PWM for Cycle-By-Cycle Current Limiting
• Internally Trimmed Reference with Undervoltage Lockout
• High Current Totem Pole Output
• Undervoltage Lockout with Hysteresis
• Low Startup and Operating Current
• These Devices are Pb-Free and are RoHS Compliant
• NCV Prefix for Automotive and Other Applications Requiring Unique Site and Control Change Requirements; AEC-Q100 Qualified and PPAP Capable

Application Scenarios

The UC3845BD1G can be used in a variety of applications, including:

• DC-DC converter
• Off-line converter
• Power MOSFET driving

Comparison

The UC3845BD1G offers the following advantages:

• High performance
• Cost-effective
• Minimal external components required

However, it has the following disadvantages:

• Fixed frequency
• Current mode operation

• High performance
• Cost-effective
• Minimal external components required

• Fixed frequency
• Current mode operation