DC-DC Controller UC2845A SMD IC

Description

The UC2842A/3A/4A/5A family of control ICs is a pin for pin compatible improved version of the UC2842/3/4/5 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 0.5 mA. Oscillator discharge is trimmed to 8.3 mA. During under voltage lockout, the output stage can sink at least 10 mA at less than 1.2 V for V CC over 5 V. Extended Temperature Performance of –40°C to 125°C Optimized for Off-line and DC to DC Converters Low Start Up Current (<0.5 mA) 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 500 kHz Operation Low R O Error Amp Technical Specifications Physical Case/Package SOIC Number of Pins 8 Technical Duty Cycle 50 % Fall Time 50 ns Frequency 500 kHz Max Duty Cycle 50 % Max Frequency 500 kHz Max Operating Temperature 125 °C Max Supply Voltage 30 V Min Operating Temperature -40 °C Number of Outputs 1 Output Current 1 A Output Voltage 15 V Packaging Tape & Reel Quiescent Current 11 mA Rise Time 50 ns Switching Frequency 500 kHz Topology Boost, Flyback Datasheet

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