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UC3843AD8TR
UC1842A/3A/4A/5A UC2842A/3A/4A/5A UC3842A/3A/4A/5A Current Mode PWM Controller FEATURES • Optimized for Off-line and DC to DC Converters • Low Start Up Current (<0.5mA) • Trimmed Oscillator Discharge Current • Automatic Feed Forward Compensation • Pulse-by-Pulse Current Limiting • Enhanced Load Response Characteristics • Under-Voltage Lockout With Hysteresis • Double Pulse Suppression • High Current Totem Pole Output • Internally Trimmed Bandgap Reference • 500kHz Operation DESCRIPTION • The UC1842A/3A/4A/5A family of control ICs is a pin for pin compatible improved version of the UC3842/3/4/5 family. Providing the necessary features to control current mode switched mode power supplies, this family has the following improved features. Start up current is guaranteed to be less than 0.5mA. Oscillator discharge is trimmed to 8.3mA. During under voltage lockout, the output stage can sink at least 10mA at less than 1.2V for VCC over 5V. The difference between members of this family are shown in the table below. Maximum Duty Cycle Part # Low RO Error Amp UVLO On UVLO Off UC1842A 16.0V 10.0V <100% UC1843A 8.5V 7.9V <100% UC1844A 16.0V 10.0V <50% UC1845A 8.5V 7.9V <50% BLOCK DIAGRAM Note 1: A/B A = DIL-8 Pin Number. B = SO-14 Pin Number. Note 2: Toggle flip flop used only in 1844A and 1845A. 9/94
TI
Texas Instruments Incorporated
U.S.A
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