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UC3845D Datasheet(PDF) 1 Page - Motorola, Inc |
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UC3845D Datasheet(HTML) 1 Page - Motorola, Inc |
1 / 14 page Device Operating Temperature Range Package UC3844, 45 UC2844, 45 HIGH PERFORMANCE CURRENT MODE CONTROLLERS ORDERING INFORMATION UC3844D UC3845D TA = 0° to +70°C TA = – 25° to +85°C SO–14 SO–14 PIN CONNECTIONS Order this document by UC3844/D D SUFFIX PLASTIC PACKAGE CASE 751A (SO–14) N SUFFIX PLASTIC PACKAGE CASE 626 1 8 1 14 (Top View) Vref (Top View) Compensation Voltage Feedback Current Sense RT/CT Vref VCC Output Gnd 1 2 3 45 6 7 8 Compensation NC Voltage Feedback NC Current Sense NC RT/CT NC VCC VC Output Gnd Power Ground 1 2 3 4 5 6 7 9 8 10 11 12 13 14 UC3844N UC3845N Plastic Plastic UC2844D UC2845D SO–14 SO–14 UC2844N UC2845N Plastic Plastic 1 MOTOROLA ANALOG IC DEVICE DATA High Performance Current Mode Controllers The UC3844, UC3845 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 for 50% to 70%. These devices are available in an 8–pin dual–in–line 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 UCX844 has UVLO thresholds of 16 V (on) and 10 V (off), ideally suited for off–line converters. The UCX845 is tailored for lower voltage applications having UVLO thresholds of 8.5 V (on) and 7.6 V (off). • 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 • Input Undervoltage Lockout with Hysteresis • Low Startup and Operating Current • Direct Interface with Motorola SENSEFET Products Simplified Block Diagram 5.0V Reference Flip Flop & Latching PWM VCC Undervoltage Lockout Oscillator Error Amplifier 7(12) VC 7(11) Output 6(10) PWR GND 5(8) 3(5) Current Sense Vref 8(14) 4(7) 2(3) 1(1) Gnd 5(9) RTCT Voltage Feedback R R + – Vref Undervoltage Lockout Output Comp. Pin numbers in parenthesis are for the D suffix SO–14 package. VCC © Motorola, Inc. 1996 Rev 1 |
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