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UC284XBD1 Fiches technique(PDF) 1 Page - Motorola, Inc |
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UC284XBD1 Fiches technique(HTML) 1 Page - Motorola, Inc |
1 / 16 page D1 SUFFIX PLASTIC PACKAGE CASE 751 (SO–8) N SUFFIX PLASTIC PACKAGE CASE 626 D SUFFIX PLASTIC PACKAGE CASE 751A (SO–14) 8 1 14 1 8 1 UC3844B, 45B UC2844B, 45B HIGH PERFORMANCE CURRENT MODE CONTROLLERS Order this document by UC3844B/D 14 13 12 11 1 2 3 4 10 9 8 5 6 7 Vref NC Compensation NC Voltage Feedback NC Current Sense NC RT/CT VCC VC Output Gnd Power Ground 1 2 3 4 Vref 8 Compensation Voltage Feedback Current Sense RT/CT VCC Output Gnd 7 6 5 PIN CONNECTIONS (Top View) (Top View) Plastic SO–14 SO–8 SO–8 UC384XBD1 UC284XBD1 ORDERING INFORMATION Device Operating Temperature Range Package UC384XBD TA = 0° to + 70°C SO–14 UC284XBN UC384XBVD UC384XBVD1 SO–8 UC384XBVN Plastic TA = – 25° to + 85°C SO–14 UC284XBD UC384XBN Plastic TA = – 40° to +105°C X indicates either a 4 or 5 to define specific device part numbers. 1 MOTOROLA ANALOG IC DEVICE DATA 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–to–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 (SO–8) plastic package as well as the 14–pin plastic surface mount (SO–14). The SO–14 package has separate power and ground pins for the totem pole output stage. The UCX844B has UVLO thresholds of 16 V (on) and 10 V (off), ideally suited for off–line converters. The UCX845B is tailored for lower voltage applications having UVLO thresholds of 8.5 V (on) and 7.6 V (off). • 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 Simplified Block Diagram Pin numbers in parenthesis are for the D suffix SO–14 package. Output VC RT/CT Vref VCC Undervoltage Lockout Gnd 5.0V Reference Vref Undervoltage Lockout Latching PWM Oscillator Error Amplifier 5(9) 3(5) 5(8) 6(10) 7(11) Power Ground Current Sense Input 1(1) 2(3) 4(7) 8(14) Output/ Compensation Voltage Feedback Input VCC 7(12) R R © Motorola, Inc. 1996 Rev 1 |
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