DC-DC Controller UC3842 SMD SOIC-14 IC

Description

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. This device is 14−pin plastic surface mount (SOIC−14). The SOIC−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). Features Trimmed Oscillator Discharge Current for Precise Duty Cycle Control Current Mode Operation to 500 kHz 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 Specifications Product Attribute Attribute Value Product Category: Switching Controllers Output Voltage: 4.9 V to 5.1 V Output Current: 1 A Minimum Operating Temperature: 0 C Maximum Operating Temperature: + 70 C Mounting Style: SMD/SMT Package/Case: SOIC-14 Packaging: Tube Operating Supply Voltage: 30 V UC3842AD Datasheet

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