UC3845BVDG

High Performance Current Mode Controllers

 

 

 

The UC3844B, UC3845B series are high performance fixed frequency

current mode controllers. They are specifically designed for Off−Line

and dc−dc converter applications offering the designer a cost−effective

solution with minimal external components. These integrated circuits

feature 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.

Also included are protective features consisting of input and

reference undervoltage lockouts each with hysteresis, cycle−by−cycle

current limiting, a latch for single pulse metering, and a flip−flop

which blanks the output off every other oscillator cycle, allowing

output deadtimes to be programmed from 50% to 70%.

These devices are available in an 8−pin dual−in−line and surface

mount (SOIC−8) plastic package as well as the 14−pin plastic surface

mount (SOIC−14). The SOIC−14 package has separate power and

ground pins for the totem pole output stage.

The UCX844B has UVLO thresholds of 16V (on) and 10V (off), ideally

suited for off−line converters. The UCX845B is tailored for lower voltage

applications having UVLO thresholds of 8.5V (on) and 7.6V (off).

 

 

 

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

 

 

 

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