HomedatasheetUC3845BVNG

UC3845BVNG Datasheet

Current Mode PWM Controllers
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Description

The UC3844B, UC3845BVNG 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, allowingoutput 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 UC3845BVNG is tailored for lower voltage applications having UVLO thresholds of 8.5V (on) and 7.6V (off). UC3845BVNG 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
Features

Parameters

[{"Name":"Switching Frequency:","Value":"500 kHz"},{"Name":"Rise Time:","Value":"50 ns"},{"Name":" Fall Time:","Value":"50 ns"},{"Name":"Operating Supply Voltage:","Value":"30 V"},{"Name":"Number of Outputs:","Value":"1"},{"Name":"Maximum Operating Temperature:","Value":"+ 70 C"},{"Name":"Minimum Operating Temperature:","Value":"0 C"},{"Name":"Output Current:","Value":"1000 mA"},{"Name":"Output Voltage:","Value":"4.9 V to 5.1 V"},{"Name":"","Value":""}]

Manufacturer information

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