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UC3842
Order this document by UC3842A/D UC3842A, 43A UC2842A, 43A High Performance Current Mode Controllers The UC3842A, UC3843A series of high performance fixed frequency current mode controllers 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 a trimmed oscillator for precise duty cycle control, 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, programmable output deadtime, and a latch for single pulse metering. 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 UCX842A has UYLO thresholds of 16 V (on) and 10 V (off), ideally suited for off–line converters. The UCX843A is tailored for lower voltage applications having UVLO thresholds of 8.5 V (on) and 7.6 V (off). • Trimmed Oscillator Discharge Current for Precise Duty Cycle Control • • • • • • • • HIGH PERFORMANCE CURRENT MODE CONTROLLERS N SUFFIX PLASTIC PACKAGE CASE 626 8 1 D SUFFIX PLASTIC PACKAGE CASE 751A (SO–14) 14 1 PIN CONNECTIONS Current Mode Operation to 500 kHz Automatic Feed Forward Compensation Compensation 1 7 VCC 6 Output RT/CT 4 High Current Totem Pole Output Vref Current Sense 3 Internally Trimmed Reference with Undervoltage Lockout 8 Voltage Feedback 2 Latching PWM for Cycle–By–Cycle Current Limiting 5 Gnd Undervoltage Lockout with Hysteresis Low Startup and Operating Current (Top View) Direct Interface with Motorola SENSEFET Products Compensation 1 14 Vref NC 2 13 NC Voltage Feedback 3 12 VCC NC 4 11 VC Current Sense 5 10 Output NC 6 9 Gnd RT/CT 7 8 Power Ground Simplified Block Diagram VCC 7(12) (Top View) Vref 5.0V Reference 8(14) R Vref Undervoltage Lockout R RTCT 2(3) Output Compensation 1(1) ORDERING INFORMATION VC Output Latching PWM + – Error Amplifier 6(10) Power Ground 5(8) Current Sense 3(5) Input Gnd Device Operating Temperature Range 5(9) Pin numbers in parenthesis are for the D suffix SO–14 package. SO–14 UC3842AD UC3843AD UC3842AN TA = 0° to +70°C SO–14 Plastic UC3843AN Plastic UC2842AD SO–14 UC2843AD UC2842AN TA = – 25° to +85°C UC2843AN © Motorola, Inc. 1996 MOTOROLA ANALOG IC DEVICE DATA Package 7(11) Oscillator 4(7) Voltage Feedback Input VCC Undervoltage Lockout SO–14 Plastic Plastic Rev 1 1
TI
Texas Instruments Incorporated
U.S.A
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